VDAReader Control

Properties   Methods   Events   Config Settings   Errors  

The VDAReader control is optimized for VDA documents, providing a simple way to parse VDA documents.

Syntax

VDAReader

Remarks

The control allows you to parse an incoming EDI document. This control works in two states, loading an entire document at once, or streaming portions of the document. These states are controlled by the BuildDOM property. By default BuildDOM is set to bdEntireDocument which parses the entire document at once, allowing you to use the XPath property to navigate the document.

To save memory for larger documents, you can choose to parse only sections of the document, instead of the entire document. When BuildDOM is set to per interchange (bdInterchange ) or per transaction (bdTransaction), the respective section of the document will be available for use with XPath from within the corresponding Start and End events. Finally, you may choose to set BuildDOM to bdNone, which means no DOM will be built and all data will be available only through events, but also will use very little memory. Below are example steps to parse an entire document:

1. First, use LoadSchema to load a schema file into the control. (Only necessary when preserving document structure).
2. Open an EDI document or stream by setting input via InputFile or InputData and calling Parse.
3. If BuildDOM is set to bdEntireDocument, the events of the control will fire as the document is parsed, and XPath may be set to access any part of the document.

   If bdInterchange or bdTransaction are specified, Parse is called the entire document will be parsed, with only the specified section being saved in memory at any given time. This means if you wish to set XPath to navigate within the section of the document, you will need to do so within the events of the control to prevent further processing of the document while you access the section. When parsing is completely, only the most recently parsed section will be available for use with XPath

   If bdNone is specified, then all document information must be obtained through the events fired during parsing.

During parsing, the control performs basic validation of the incoming document. If validation fails, a warning is generated (fired as an event).

The XPath navigation is done through the XPath property. For example: EDIReader.XPath = "/IX[1]/FG[1]/TX[2]/N1Loop1[1]/N1[1]"; This example path means the following: Select the first N1 segment within the first iteration of the N1Loop1, within second transaction in the first functional group and interchange.

You can also make use of XPath conditional statements to locate the first element which matches a name=value. For example, you could use the following XPath to locate the path of the first element within any N1Loop1 that has a name=N101 and value=BT: EDIReader.XPath = "IX[1]/FG[1]/TX[1]/N1Loop1[N101='BT']";

Note that the conditional statements will search the children, but not the grand children of the element on which the conditional statement is applied. For instance in the above example the children of N1Loop1 will be searched, but the grandchildren will not.

Additionally if the schema loaded is a ArcESB JSON schema the element Id (from the schema) can be used in the conditional statement. For instance instead of N101 the following is also acceptable: EDIReader.XPath = "IX[1]/FG[1]/TX[1]/N1Loop1[98='BT']";

To display the structure of the parsed document use DisplaySchemaInfo. This is helpful when deciding how to navigate the document.

Property List

---

The following is the full list of the properties of the control with short descriptions. Click on the links for further details.

Method List

---

The following is the full list of the methods of the control with short descriptions. Click on the links for further details.

Event List

---

The following is the full list of the events fired by the control with short descriptions. Click on the links for further details.

Config Settings

---

The following is a list of config settings for the control with short descriptions. Click on the links for further details.

BuildDOM Property (VDAReader Control)

When True, an internal object model of the EDI document is created.

Syntax

vdareadercontrol.BuildDOM[=integer]

Possible Values

bdEntireDocument(0), 
bdInterchange(1), 
bdTransaction(2), 
bdNone(3)

Default Value

0

Remarks

Set BuildDOM to bdEntireDocument (0) when you need to browse the current document through XPath.

Use bdInterchange (1) when parsing large documents to tell the control to only hold an internal object model of the current Interchange being parsed. When this value is used, and a new Interchange is encountered during parsing, the old interchange is cleared from memory. If the input contains a single Interchange, this is equivalent to using bdEntireDocument.

Use bdTransaction (2) when parsing large documents to tell the control to only hold an internal object model of the current transaction being parsed. When this value is used, and a new transaction is encountered during parsing, the old transaction is cleared from memory.

A value of bdNone (3) will tell the control to not save any internal state of the document being parsed, and thus XPath will be unavailable.

Data Type

Integer

EDIStandardVersion Property (VDAReader Control)

The version of the EDI specification.

Syntax

vdareadercontrol.EDIStandardVersion

Default Value

""

Remarks

This property will be populated after parsing begins and the correct version string for is located via the schema, such as 004010 for X12.

This property is read-only and not available at design time.

Data Type

String

ExtraData Property (VDAReader Control)

Extra data that has not been parsed by the control.

Syntax

vdareadercontrol.ExtraData

Default Value

""

Remarks

This property will only be populated after the Flush method has been called and data exists in the internal parser which has not been processed.

This property is read-only and not available at design time.

Data Type

String

InputData Property (VDAReader Control)

The data to parse.

Syntax

vdareadercontrol.InputData[=string]

Default Value

""

Remarks

This property specifies the data to be parsed.

Input Properties

The control will determine the source of the input based on which properties are set.

The order in which the input properties are checked is as follows:

• InputFile
• InputData

When a valid source is found the search stops.

Data Type

String

InputFile Property (VDAReader Control)

The file to parse.

Syntax

vdareadercontrol.InputFile[=string]

Default Value

""

Remarks

This property specifies the file to be processed. Set this property to the full or relative path to the file which will be processed.

Input Properties

The control will determine the source of the input based on which properties are set.

The order in which the input properties are checked is as follows:

• InputFile
• InputData

When a valid source is found the search stops.

This property is not available at design time.

Data Type

String

Offset Property (VDAReader Control)

Current offset of the document being parsed.

Syntax

vdareadercontrol.Offset

Default Value

0

Remarks

This property is useful for determining the location of possible EDI errors in the document.

This property is read-only and not available at design time.

Data Type

Long64

SchemaFormat Property (VDAReader Control)

The format of the schema file.

Syntax

vdareadercontrol.SchemaFormat[=integer]

Possible Values

schemaAutomatic(0), 
schemaBinary(1), 
schemaBizTalk(2), 
schemaSEF(3), 
schemaBOTS(4), 
schemaAltova(5), 
schemaJSON(6)

Default Value

0

Remarks

Set SchemaFormat before calling the LoadSchema method to specify the loading schema format.

The following schema formats are supported:

Data Type

Integer

XChildren Property (VDAReader Control)

Number of child elements of the current segment.

Syntax

vdareadercontrol.XChildren

Default Value

0

Remarks

This property describes the number of children of the current segment in the parsed document.

This property is read-only and not available at design time.

Data Type

Integer

ElementCount Property (VDAReader Control)

The number of records in the Element arrays.

Syntax

vdareadercontrol.ElementCount

Default Value

0

Remarks

This property controls the size of the following arrays:

• ElementComponentCount
• ElementComponentIndex
• ElementComponentName
• ElementComponentSchemaDesc
• ElementComponentSchemaName
• ElementComponentType
• ElementComponentValue
• ElementDataType
• ElementName
• ElementRepeatCount
• ElementRepeatIndex
• ElementSchemaDesc
• ElementSchemaName
• ElementValue

The array indices start at 0 and end at ElementCount - 1.

This property is read-only and not available at design time.

Data Type

Integer

ElementComponentCount Property (VDAReader Control)

Number of controls in the current element.

Syntax

vdareadercontrol.ElementComponentCount(ElementIndex)

Default Value

0

Remarks

Number of components in the current element.

The ElementIndex parameter specifies the index of the item in the array. The size of the array is controlled by the ElementCount property.

This property is read-only and not available at design time.

Data Type

Integer

ElementComponentIndex Property (VDAReader Control)

The index of the selected control of the current element.

Syntax

vdareadercontrol.ElementComponentIndex(ElementIndex)[=integer]

Default Value

1

Remarks

The index of the selected component of the current element. ElementComponentIndex valid values are from 0 to (ElementComponentCount - 1).

The ElementIndex parameter specifies the index of the item in the array. The size of the array is controlled by the ElementCount property.

This property is not available at design time.

Data Type

Integer

ElementComponentName Property (VDAReader Control)

The name of the control selected by ControlIndex , according to the Transaction Set schema.

Syntax

vdareadercontrol.ElementComponentName(ElementIndex)

Default Value

""

Remarks

The name of the component selected by ElementComponentIndex, according to the Transaction Set schema.

The name is based on the position of the element within the segment. For instance "DTM0101".

See ElementComponentSchemaName for additional details.

Note: This property is only applicable when a ArcESB JSON schema is loaded.

The ElementIndex parameter specifies the index of the item in the array. The size of the array is controlled by the ElementCount property.

This property is read-only and not available at design time.

Data Type

String

ElementComponentSchemaDesc Property (VDAReader Control)

The textual description of the control from the loaded ArcESB JSON schema.

Syntax

vdareadercontrol.ElementComponentSchemaDesc(ElementIndex)

Default Value

""

Remarks

The textual description of the component from the loaded ArcESB JSON schema.

This property holds a human readable description of the component as obtained from the ArcESB JSON schema.

Note: This property is only applicable when a ArcESB JSON schema is loaded.

The ElementIndex parameter specifies the index of the item in the array. The size of the array is controlled by the ElementCount property.

This property is read-only and not available at design time.

Data Type

String

ElementComponentSchemaName Property (VDAReader Control)

The name of the control as taken from the schema.

Syntax

vdareadercontrol.ElementComponentSchemaName(ElementIndex)

Default Value

""

Remarks

The name of the component as taken from the schema.

ElementComponentName holds positional (ref) value like "DTM0101". ElementComponentSchemaName holds the Id taken from the schema.

For instance: reader.XPath = "/IX/TX/DTM"; for (int i = 0; i < reader.XElements[0].ComponentCount; i++) { reader.XElements[0].ComponentIndex = i; Console.WriteLine(reader.XElements[i].ComponentSchemaName + ": " + reader.XElements[i].ComponentValue); }

When ElementComponentSchemaName is used this will use the name from the schema and will output values like:

2005: 137
2005: 137
2380: 201612151441

In contrast, if ElementComponentName was used the output would look like:

DTM0101: 137
DTM0101: 137
DTM0102: 201612151441

Note: This property is only applicable when a ArcESB JSON schema is loaded.

The ElementIndex parameter specifies the index of the item in the array. The size of the array is controlled by the ElementCount property.

This property is read-only and not available at design time.

Data Type

String

ElementComponentType Property (VDAReader Control)

The data type of control selected by ControlIndex , according to the Transaction Set Schema.

Syntax

vdareadercontrol.ElementComponentType(ElementIndex)

Default Value

""

Remarks

The data type of component selected by ElementComponentIndex, according to the Transaction Set Schema.

Possible values are:

The ElementIndex parameter specifies the index of the item in the array. The size of the array is controlled by the ElementCount property.

This property is read-only and not available at design time.

Data Type

String

ElementComponentValue Property (VDAReader Control)

The value of the control selected by ControlIndex .

Syntax

vdareadercontrol.ElementComponentValue(ElementIndex)

Default Value

""

Remarks

The value of the component selected by ElementComponentIndex.

The ElementIndex parameter specifies the index of the item in the array. The size of the array is controlled by the ElementCount property.

This property is read-only and not available at design time.

Data Type

String

ElementDataType Property (VDAReader Control)

The data type of this EDI element, according to the Transaction Set Schema.

Syntax

vdareadercontrol.ElementDataType(ElementIndex)

Default Value

""

Remarks

The data type of this EDI element, according to the Transaction Set Schema.

Possible values are:

The ElementIndex parameter specifies the index of the item in the array. The size of the array is controlled by the ElementCount property.

This property is read-only and not available at design time.

Data Type

String

ElementName Property (VDAReader Control)

The name of this EDI element, according to the Transaction Set schema.

Syntax

vdareadercontrol.ElementName(ElementIndex)

Default Value

""

Remarks

The name of this EDI element, according to the Transaction Set schema. The name is based on the position of the element within the segment. For instance "N101".

See ElementSchemaName for additional details.

Note: This property is only applicable when a ArcESB JSON schema is loaded.

The ElementIndex parameter specifies the index of the item in the array. The size of the array is controlled by the ElementCount property.

This property is read-only and not available at design time.

Data Type

String

ElementRepeatCount Property (VDAReader Control)

The number of times this element is repeated in the in the segment.

Syntax

vdareadercontrol.ElementRepeatCount(ElementIndex)

Default Value

1

Remarks

The number of times this element is repeated in the in the segment. If the element is not repeated this will return 0.

To access the repeated element values set ElementRepeatIndex.

The ElementIndex parameter specifies the index of the item in the array. The size of the array is controlled by the ElementCount property.

This property is read-only and not available at design time.

Data Type

Integer

ElementRepeatIndex Property (VDAReader Control)

The index of the selected instance of this repeatable element.

Syntax

vdareadercontrol.ElementRepeatIndex(ElementIndex)[=integer]

Default Value

1

Remarks

The index of the selected instance of this repeatable element. ElementRepeatIndex valid values are from 0 to (ElementRepeatCount - 1).

Setting ElementRepeatIndex will affect the value reported by all other properties.

The ElementIndex parameter specifies the index of the item in the array. The size of the array is controlled by the ElementCount property.

This property is not available at design time.

Data Type

Integer

ElementSchemaDesc Property (VDAReader Control)

The textual description of the element from the loaded ArcESB JSON schema.

Syntax

vdareadercontrol.ElementSchemaDesc(ElementIndex)

Default Value

""

Remarks

The textual description of the element from the loaded ArcESB JSON schema.

This property holds a human readable description of the element as obtained from the ArcESB JSON schema.

Note: This property is only applicable when a ArcESB JSON schema is loaded.

The ElementIndex parameter specifies the index of the item in the array. The size of the array is controlled by the ElementCount property.

This property is read-only and not available at design time.

Data Type

String

ElementSchemaName Property (VDAReader Control)

The name of the element as taken from the schema.

Syntax

vdareadercontrol.ElementSchemaName(ElementIndex)

Default Value

""

Remarks

The name of the element as taken from the schema.

ElementName holds positional (ref) value like "N101". ElementSchemaName holds the Id taken from the schema.

For instance: reader.XPath = "/IX/FG/TX/N1Loop1[1]/N1"; for (int i = 0; i < reader.XElements.Count; i++) { Console.WriteLine(reader.XElements[i].SchemaName + ": " + reader.XElements[i].Value); }

When ElementSchemaName is used this will use the name from the schema and will output values like:

98: ST
93: BUYSNACKS PORT
66: 9
67: 1223334445

In contrast, if ElementName was used the output would look like:

N101: ST
N102: BUYSNACKS PORT
N103: 9
N104: 1223334445

Note: This property is only applicable when a ArcESB JSON schema is loaded.

The ElementIndex parameter specifies the index of the item in the array. The size of the array is controlled by the ElementCount property.

This property is read-only and not available at design time.

Data Type

String

ElementValue Property (VDAReader Control)

The value directly associated with this EDI element.

Syntax

vdareadercontrol.ElementValue(ElementIndex)

Default Value

""

Remarks

The value directly associated with this EDI element.

Note that this property will be populated with the entire element contents when a composite element exists. The components of the composite element will also be parsed out into the ElementComponentName, ElementComponentType, and ElementComponentValue properties.

The ElementIndex parameter specifies the index of the item in the array. The size of the array is controlled by the ElementCount property.

This property is read-only and not available at design time.

Data Type

String

XPath Property (VDAReader Control)

Provides a way to point to a specific segment in the document.

Syntax

vdareadercontrol.XPath[=string]

Default Value

""

Remarks

The path is a series of one or more segment accessors separated by '/'. The path can be absolute (starting with '/') or relative to the current XPath location.

The following are possible values for an element accessor:

When XPath is set to a valid path, XSegment points to the name of the segment, with XTag, XSegmentType, and XChildren providing other properties of the segment. The elements of the current segment are provided in the XElements properties.

BuildDOM must be set to bdEntireDocument or bdTransaction prior to parsing the document for the XPath functionality to be available.

Example (Setting XPath)

Data Type

String

XSegment Property (VDAReader Control)

The name of the current segment.

Syntax

vdareadercontrol.XSegment

Default Value

""

Remarks

The name of the current segment according to the schema. The current segment is specified via the XPath property.

This property is read-only and not available at design time.

Data Type

String

XSegmentNumber Property (VDAReader Control)

The number of the current segment.

Syntax

vdareadercontrol.XSegmentNumber

Default Value

0

Remarks

The number of the current segment according to the schema. The current segment is specified via the XPath property.

This property is read-only and not available at design time.

Data Type

Integer

XSegmentType Property (VDAReader Control)

Indicates the current segment type.

Syntax

vdareadercontrol.XSegmentType

Possible Values

stNone(0), 
stInterchange(1), 
stFunctionalGroup(2), 
stTransaction(3), 
stInterchangeHeader(4), 
stFunctionalGroupHeader(5), 
stTransactionHeader(6), 
stTransactionSegment(7), 
stTransactionLoop(8), 
stTransactionFooter(9), 
stFunctionalGroupFooter(10), 
stInterchangeFooter(11)

Default Value

0

Remarks

The current segment will be a control segment footer/header or a transaction data segment.

This property is read-only and not available at design time.

Data Type

Integer

XTag Property (VDAReader Control)

The tag of the current segment.

Syntax

vdareadercontrol.XTag

Default Value

""

Remarks

The current segment is specified via the XPath property.

This property is read-only and not available at design time.

Data Type

String

XTransactionCode Property (VDAReader Control)

The transaction code of the current segment.

Syntax

vdareadercontrol.XTransactionCode

Default Value

""

Remarks

The current segment is specified via the XPath property.

This property is read-only and not available at design time.

Data Type

String

CompileSchema Method (VDAReader Control)

Compiles an existing XSD schema into an optimized binary representation.

Syntax

vdareadercontrol.CompileSchema XsdSchema, BinSchema

Remarks

This method parses XsdSchema and generates an optimized binary representation that is saved into the path referenced by BinSchema. Binary schemas are smaller and require less resources when loading later using LoadSchema

If the schema file does not exists or cannot be parsed as an EDI schema, the component throws an exception.

Config Method (VDAReader Control)

Sets or retrieves a configuration setting.

Syntax

vdareadercontrol.Config ConfigurationString

Remarks

Config is a generic method available in every control. It is used to set and retrieve configuration settings for the control.

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the control, access to these internal properties is provided through the Config method.

To set a configuration setting named PROPERTY, you must call Config("PROPERTY=VALUE"), where VALUE is the value of the setting expressed as a string. For boolean values, use the strings "True", "False", "0", "1", "Yes", or "No" (case does not matter).

To read (query) the value of a configuration setting, you must call Config("PROPERTY"). The value will be returned as a string.

DisplaySchemaInfo Method (VDAReader Control)

Returns a string showing the structure of the schema defining the document.

Syntax

vdareadercontrol.DisplaySchemaInfo 

Remarks

After calling LoadSchema this may be called to obtain information about the structure of the schema defining the document. If the desired XPath is not known this helps determine the structure so that the correct XPath can be built.

Note: A valid schema must be loaded via LoadSchema.

For instance: Console.WriteLine(component.DisplaySchemaInfo()); Will output text like:

UNH[0,1]
  BGM[0,1]
  DTM[0,35]
  PAI[0,1]
  ALI[0,5]
  IMD[0,1]
  FTX[0,10]
  LOC[0,10]
  GIS[0,10]
  DGS[0,1]
  RFFLoop1[0,99]
    RFF[0,1]
    DTM_2[0,5]
    GIR[0,5]
    LOC_2[0,2]
    MEA[0,5]
    QTY[0,2]
    FTX_2[0,5]
    MOA[0,2]
  NADLoop1[0,99]
    NAD[0,1]
    LOC_3[0,25]
    FII[0,5]
    RFFLoop2[0,9999]
      RFF_2[0,1]
      DTM_3[0,5]
    DOCLoop1[0,5]
      DOC[0,1]
      DTM_4[0,5]
    CTALoop1[0,5]
      CTA[0,1]
      COM[0,5]
  TAXLoop1[0,5]
    TAX[0,1]
    MOA_2[0,1]
    LOC_4[0,5]
  CUXLoop1[0,5]
    CUX[0,1]
    DTM_5[0,5]
  PATLoop1[0,10]
    PAT[0,1]
    DTM_6[0,5]
    PCD[0,1]
    MOA_3[0,1]
    PAI_2[0,1]
    FII_2[0,1]
  TDTLoop1[0,10]
    TDT[0,1]
    TSR[0,1]
    LOCLoop1[0,10]
      LOC_5[0,1]
      DTM_7[0,5]
    RFFLoop3[0,9999]
      RFF_3[0,1]
      DTM_8[0,5]
  TODLoop1[0,5]
    TOD[0,1]
    LOC_6[0,2]
  PACLoop1[0,1000]
    PAC[0,1]
    MEA_2[0,5]
    EQD[0,1]
    PCILoop1[0,5]
      PCI[0,1]
      RFF_4[0,1]
      DTM_9[0,5]
      GIN[0,5]
  ALCLoop1[0,9999]
    ALC[0,1]
    ALI_2[0,5]
    FTX_3[0,1]
    RFFLoop4[0,5]
      RFF_5[0,1]
      DTM_10[0,5]
    QTYLoop1[0,1]
      QTY_2[0,1]
      RNG[0,1]
    PCDLoop1[0,1]
      PCD_2[0,1]
      RNG_2[0,1]
    MOALoop1[0,2]
      MOA_4[0,1]
      RNG_3[0,1]
      CUX_2[0,1]
      DTM_11[0,1]
    RTELoop1[0,1]
      RTE[0,1]
      RNG_4[0,1]
    TAXLoop2[0,5]
      TAX_2[0,1]
      MOA_5[0,1]
  RCSLoop1[0,100]
    RCS[0,1]
    RFF_6[0,5]
    DTM_12[0,5]
    FTX_4[0,5]
  AJTLoop1[0,1]
    AJT[0,1]
    FTX_5[0,5]
  INPLoop1[0,1]
    INP[0,1]
    FTX_6[0,5]
  LINLoop1[0,9999999]
    LIN[0,1]
    PIA[0,25]
    IMD_2[0,10]
    MEA_3[0,5]
    QTY_3[0,5]
    PCD_3[0,1]
    ALI_3[0,5]
    DTM_13[0,35]
    GIN_2[0,1000]
    GIR_2[0,1000]
    QVR[0,1]
    EQD_2[0,1]
    FTX_7[0,5]
    DGS_2[0,1]
    MOALoop2[0,10]
      MOA_6[0,1]
      CUX_3[0,1]
    PATLoop2[0,10]
      PAT_2[0,1]
      DTM_14[0,5]
      PCD_4[0,1]
      MOA_7[0,1]
    PRILoop1[0,25]
      PRI[0,1]
      CUX_4[0,1]
      APR[0,1]
      RNG_5[0,1]
      DTM_15[0,5]
    RFFLoop5[0,10]
      RFF_7[0,1]
      DTM_16[0,5]
    PACLoop2[0,10]
      PAC_2[0,1]
      MEA_4[0,10]
      EQD_3[0,1]
      PCILoop2[0,10]
        PCI_2[0,1]
        RFF_8[0,1]
        DTM_17[0,5]
        GIN_3[0,10]
    LOCLoop2[0,9999]
      LOC_7[0,1]
      QTY_4[0,100]
      DTM_18[0,5]
    TAXLoop3[0,99]
      TAX_3[0,1]
      MOA_8[0,1]
      LOC_8[0,5]
    NADLoop2[0,99]
      NAD_2[0,1]
      LOC_9[0,5]
      RFFLoop6[0,5]
        RFF_9[0,1]
        DTM_19[0,5]
      DOCLoop2[0,5]
        DOC_2[0,1]
        DTM_20[0,5]
      CTALoop2[0,5]
        CTA_2[0,1]
        COM_2[0,5]
    ALCLoop2[0,30]
      ALC_2[0,1]
      ALI_4[0,5]
      DTM_21[0,5]
      FTX_8[0,1]
      QTYLoop2[0,1]
        QTY_5[0,1]
        RNG_6[0,1]
      PCDLoop2[0,1]
        PCD_5[0,1]
        RNG_7[0,1]
      MOALoop3[0,2]
        MOA_9[0,1]
        RNG_8[0,1]
        CUX_5[0,1]
        DTM_22[0,1]
      RTELoop2[0,1]
        RTE_2[0,1]
        RNG_9[0,1]
      TAXLoop4[0,5]
        TAX_4[0,1]
        MOA_10[0,1]
    TDTLoop2[0,10]
      TDT_2[0,1]
      LOCLoop3[0,10]
        LOC_10[0,1]
        DTM_23[0,5]
    TODLoop2[0,5]
      TOD_2[0,1]
      LOC_11[0,2]
    RCSLoop2[0,100]
      RCS_2[0,1]
      RFF_10[0,5]
      DTM_24[0,5]
      FTX_9[0,5]
    GISLoop1[0,10]
      GIS_2[0,1]
      RFF_11[0,1]
      DTM_25[0,5]
      GIR_3[0,5]
      LOC_12[0,2]
      MEA_5[0,5]
      QTY_6[0,2]
      FTX_10[0,5]
      MOA_11[0,2]
  UNS[0,1]
  CNT[0,10]
  MOALoop4[0,100]
    MOA_12[0,1]
    RFFLoop7[0,1]
      RFF_12[0,1]
      DTM_26[0,5]
  TAXLoop5[0,10]
    TAX_5[0,1]
    MOA_13[0,2]
  ALCLoop3[0,15]
    ALC_3[0,1]
    ALI_5[0,1]
    MOA_14[0,2]
    FTX_11[0,1]
  UNT[0,1]

DisplayXMLInfo Method (VDAReader Control)

Returns a string showing the structure of the parsed document as XML.

Syntax

vdareadercontrol.DisplayXMLInfo 

Remarks

After the EDI document has been parsed this method may be called to obtain information about the document structure. The parsed data is represented as XML when queried. This shows all parsed data and may be useful for testing and debugging purposes. For instance: Console.WriteLine(component.DisplayXMLInfo()); Will output text like:

<IX tag="UNB" UNB1="UNOB:1" UNB2="WAYNE_TECH" UNB3="ACME" UNB4="160707:1547" UNB5="000000002" UNB6="" UNB7="1234" UNB8="" UNB9="" UNB10="" UNB11="1">
  <TX tag="UNH" UNH1="509010117" UNH2="INVOIC:D:97A:UN">
    <BGM tag="BGM" BGM01="380:::TAX INVOICE" BGM02="0013550417" BGM03="9"/>
    <DTM tag="DTM" DTM01="3:20070926:102"/>
    <DTM tag="DTM" DTM01="4:20061123:102"/>
    <FTX tag="FTX" FTX01="AAI" FTX02="1"/>
    <TAXLoop1>
      <TAX tag="TAX" TAX01="7" TAX02="VAT" TAX03="" TAX04="" TAX05=":::10072.14" TAX06="S"/>
    </TAXLoop1>
    <CUXLoop1>
      <CUX tag="CUX" CUX01="2:EUR:4" CUX02="" CUX03="0.67529"/>
    </CUXLoop1>
    <PATLoop1>
      <PAT tag="PAT" PAT01="1"/>
      <DTM_6 tag="DTM" DTM01="10:20070926:102"/>
      <PCD tag="PCD" PCD01="2:0:13"/>
    </PATLoop1>
    <LINLoop1>
      <LIN tag="LIN" LIN01="000030" LIN02=""/>
      <PIA tag="PIA" PIA01="1" PIA02="2265S13:BP::92"/>
      <PIA tag="PIA" PIA01="1" PIA02="5029766832002:UP::92"/>
      <IMD_2 tag="IMD" IMD01="F" IMD02=""/>
      <QTY_3 tag="QTY" QTY01="47:50.000:EA"/>
      <DTM_13 tag="DTM" DTM01="11:20070926:102"/>
      <MOALoop2>
        <MOA_6 tag="MOA" MOA01="203:19150.00"/>
      </MOALoop2>
      <PRILoop1>
        <PRI tag="PRI" PRI01="INV:383.00:TU"/>
      </PRILoop1>
      <TAXLoop3>
        <TAX_3 tag="TAX" TAX01="7" TAX02="VAT" TAX03="" TAX04="" TAX05=":::17.500" TAX06="S"/>
        <MOA_8 tag="MOA" MOA01="125:19150.45"/>
      </TAXLoop3>
      <ALCLoop2>
        <ALC_2 tag="ALC" ALC01="C" ALC02="0.45" ALC03="" ALC04="" ALC05="FC"/>
        <MOALoop3>
          <MOA_9 tag="MOA" MOA01="8:0.45"/>
        </MOALoop3>
      </ALCLoop2>
    </LINLoop1>
    <LINLoop1>
      <LIN tag="LIN" LIN01="000040" LIN02=""/>
      <PIA tag="PIA" PIA01="1" PIA02="2269F22:BP::92"/>
      <PIA tag="PIA" PIA01="1" PIA02="5051254078241:UP::92"/>
      <IMD_2 tag="IMD" IMD01="F" IMD02=""/>
      <QTY_3 tag="QTY" QTY01="47:20.000:EA"/>
      <DTM_13 tag="DTM" DTM01="11:20070926:102"/>
      <MOALoop2>
        <MOA_6 tag="MOA" MOA01="203:21060.00"/>
      </MOALoop2>
      <PRILoop1>
        <PRI tag="PRI" PRI01="INV:1053.00:TU"/>
      </PRILoop1>
      <TAXLoop3>
        <TAX_3 tag="TAX" TAX01="7" TAX02="VAT" TAX03="" TAX04="" TAX05=":::17.500" TAX06="S"/>
        <MOA_8 tag="MOA" MOA01="125:21060.50"/>
      </TAXLoop3>
      <ALCLoop2>
        <ALC_2 tag="ALC" ALC01="C" ALC02="0.50" ALC03="" ALC04="" ALC05="FC"/>
        <MOALoop3>
          <MOA_9 tag="MOA" MOA01="8:0.50"/>
        </MOALoop3>
      </ALCLoop2>
    </LINLoop1>
    <LINLoop1>
      <LIN tag="LIN" LIN01="000170" LIN02=""/>
      <PIA tag="PIA" PIA01="1" PIA02="2269F10:BP::92"/>
      <PIA tag="PIA" PIA01="1" PIA02="5051254078326:UP::92"/>
      <IMD_2 tag="IMD" IMD01="F" IMD02=""/>
      <QTY_3 tag="QTY" QTY01="47:10.000:EA"/>
      <DTM_13 tag="DTM" DTM01="11:20070926:102"/>
      <MOALoop2>
        <MOA_6 tag="MOA" MOA01="203:6950.00"/>
      </MOALoop2>
      <PRILoop1>
        <PRI tag="PRI" PRI01="INV:695.00:TU"/>
      </PRILoop1>
      <TAXLoop3>
        <TAX_3 tag="TAX" TAX01="7" TAX02="VAT" TAX03="" TAX04="" TAX05=":::17.500" TAX06="S"/>
        <MOA_8 tag="MOA" MOA01="125:6950.16"/>
      </TAXLoop3>
      <ALCLoop2>
        <ALC_2 tag="ALC" ALC01="C" ALC02="0.16" ALC03="" ALC04="" ALC05="FC"/>
        <MOALoop3>
          <MOA_9 tag="MOA" MOA01="8:0.16"/>
        </MOALoop3>
      </ALCLoop2>
    </LINLoop1>
    <LINLoop1>
      <LIN tag="LIN" LIN01="000190" LIN02=""/>
      <PIA tag="PIA" PIA01="1" PIA02="2269F26:BP::92"/>
      <PIA tag="PIA" PIA01="1" PIA02="5051254051190:UP::92"/>
      <IMD_2 tag="IMD" IMD01="F" IMD02=""/>
      <QTY_3 tag="QTY" QTY01="47:5.000:EA"/>
      <DTM_13 tag="DTM" DTM01="11:20070926:102"/>
      <MOALoop2>
        <MOA_6 tag="MOA" MOA01="203:2375.00"/>
      </MOALoop2>
      <PRILoop1>
        <PRI tag="PRI" PRI01="INV:475.00:TU"/>
      </PRILoop1>
      <TAXLoop3>
        <TAX_3 tag="TAX" TAX01="7" TAX02="VAT" TAX03="" TAX04="" TAX05=":::17.500" TAX06="S"/>
        <MOA_8 tag="MOA" MOA01="125:2375.06"/>
      </TAXLoop3>
      <ALCLoop2>
        <ALC_2 tag="ALC" ALC01="C" ALC02="0.06" ALC03="" ALC04="" ALC05="FC"/>
        <MOALoop3>
          <MOA_9 tag="MOA" MOA01="8:0.06"/>
        </MOALoop3>
      </ALCLoop2>
    </LINLoop1>
    <LINLoop1>
      <LIN tag="LIN" LIN01="000200" LIN02=""/>
      <PIA tag="PIA" PIA01="1" PIA02="2265S24:BP::92"/>
      <PIA tag="PIA" PIA01="1" PIA02="5029766000685:UP::92"/>
      <IMD_2 tag="IMD" IMD01="F" IMD02=""/>
      <QTY_3 tag="QTY" QTY01="47:3.000:EA"/>
      <DTM_13 tag="DTM" DTM01="11:20070926:102"/>
      <MOALoop2>
        <MOA_6 tag="MOA" MOA01="203:957.00"/>
      </MOALoop2>
      <PRILoop1>
        <PRI tag="PRI" PRI01="INV:319.00:TU"/>
      </PRILoop1>
      <TAXLoop3>
        <TAX_3 tag="TAX" TAX01="7" TAX02="VAT" TAX03="" TAX04="" TAX05=":::17.500" TAX06="S"/>
        <MOA_8 tag="MOA" MOA01="125:957.02"/>
      </TAXLoop3>
      <ALCLoop2>
        <ALC_2 tag="ALC" ALC01="C" ALC02="0.02" ALC03="" ALC04="" ALC05="FC"/>
        <MOALoop3>
          <MOA_9 tag="MOA" MOA01="8:0.02"/>
        </MOALoop3>
      </ALCLoop2>
    </LINLoop1>
    <LINLoop1>
      <LIN tag="LIN" LIN01="000210" LIN02=""/>
      <PIA tag="PIA" PIA01="1" PIA02="2263T95:BP::92"/>
      <PIA tag="PIA" PIA01="1" PIA02="5029766699575:UP::92"/>
      <IMD_2 tag="IMD" IMD01="F" IMD02=""/>
      <QTY_3 tag="QTY" QTY01="47:3.000:EA"/>
      <DTM_13 tag="DTM" DTM01="11:20070926:102"/>
      <MOALoop2>
        <MOA_6 tag="MOA" MOA01="203:2085.00"/>
      </MOALoop2>
      <PRILoop1>
        <PRI tag="PRI" PRI01="INV:695.00:TU"/>
      </PRILoop1>
      <TAXLoop3>
        <TAX_3 tag="TAX" TAX01="7" TAX02="VAT" TAX03="" TAX04="" TAX05=":::17.500" TAX06="S"/>
        <MOA_8 tag="MOA" MOA01="125:2085.05"/>
      </TAXLoop3>
      <ALCLoop2>
        <ALC_2 tag="ALC" ALC01="C" ALC02="0.05" ALC03="" ALC04="" ALC05="FC"/>
        <MOALoop3>
          <MOA_9 tag="MOA" MOA01="8:0.05"/>
        </MOALoop3>
      </ALCLoop2>
    </LINLoop1>
    <LINLoop1>
      <LIN tag="LIN" LIN01="000250" LIN02=""/>
      <PIA tag="PIA" PIA01="1" PIA02="2269F15:BP::92"/>
      <PIA tag="PIA" PIA01="1" PIA02="5051254080091:UP::92"/>
      <IMD_2 tag="IMD" IMD01="F" IMD02=""/>
      <QTY_3 tag="QTY" QTY01="47:3.000:EA"/>
      <DTM_13 tag="DTM" DTM01="11:20070926:102"/>
      <MOALoop2>
        <MOA_6 tag="MOA" MOA01="203:4977.00"/>
      </MOALoop2>
      <PRILoop1>
        <PRI tag="PRI" PRI01="INV:1659.00:TU"/>
      </PRILoop1>
      <TAXLoop3>
        <TAX_3 tag="TAX" TAX01="7" TAX02="VAT" TAX03="" TAX04="" TAX05=":::17.500" TAX06="S"/>
        <MOA_8 tag="MOA" MOA01="125:4977.12"/>
      </TAXLoop3>
      <ALCLoop2>
        <ALC_2 tag="ALC" ALC01="C" ALC02="0.12" ALC03="" ALC04="" ALC05="FC"/>
        <MOALoop3>
          <MOA_9 tag="MOA" MOA01="8:0.12"/>
        </MOALoop3>
      </ALCLoop2>
    </LINLoop1>
    <UNS tag="UNS" UNS01="S"/>
    <CNT tag="CNT" CNT01="4:7"/>
    <MOALoop4>
      <MOA_12 tag="MOA" MOA01="9:67627.50"/>
    </MOALoop4>
    <MOALoop4>
      <MOA_12 tag="MOA" MOA01="79:57554.00"/>
    </MOALoop4>
    <TAXLoop5>
      <TAX_5 tag="TAX" TAX01="7" TAX02="VAT" TAX03="" TAX04="" TAX05=":::17.500" TAX06="S"/>
      <MOA_13 tag="MOA" MOA01="125:57555.36:EUR:3"/>
      <MOA_13 tag="MOA" MOA01="124:10072.14:EUR:3"/>
    </TAXLoop5>
    <ALCLoop3>
      <ALC_3 tag="ALC" ALC01="C" ALC02="1.36" ALC03="" ALC04="" ALC05="FC"/>
      <MOA_14 tag="MOA" MOA01="8:1.36"/>
    </ALCLoop3>
  </TX>
</IX>

Flush Method (VDAReader Control)

Flushes the parser and checks its end state.

Syntax

vdareadercontrol.Flush 

Remarks

When Flush is called, the parser flushes all its buffers, firing events as necessary, and then checks its end state.

Any extra un-parsed data will be populated in the ExtraData property after this method is called.

GenerateAck Method (VDAReader Control)

Generates an EDI acknowledgement.

Syntax

vdareadercontrol.GenerateAck 

Remarks

This functionality is not yet implemented and is reserved for future use.

HasXPath Method (VDAReader Control)

Determines whether a specific element exists in the document.

Syntax

vdareadercontrol.HasXPath XPath

Remarks

This method determines whether a particular XPath exists within the document. This may be used to check if a path exists before setting it via XPath.

This method returns True if the xpath exists, False if not.

See XPath for details on the XPath syntax.

LoadSchema Method (VDAReader Control)

Loads a schema file describing a Transaction Set.

Syntax

vdareadercontrol.LoadSchema FileName

Remarks

This method parses the File and loads it into an internal schema list. The control will attempt to automatically detect the SchemaFormat.

If the schema file does not exist or cannot be parsed as an EDI schema, the control fails with an error.

Parse Method (VDAReader Control)

Parse the specified input data.

Syntax

vdareadercontrol.Parse 

Remarks

This method parsed the input data specified by InputFile or InputData.

During parsing the following events may fire:

• StartInterchange
• StartFunctionalGroup
• StartTransaction
• Segment
• StartLoop
• EndLoop
• EndTransaction
• EndFunctionalGroup
• EndInterchange

After Parse returns the document may be traversed by setting the XPath property. The XPath navigation is done through the XPath property. For example: EDIReader.XPath = "/IX[1]/FG[1]/TX[2]/N1Loop1[1]/N1[1]"; This example path means the following: Select the first N1 segment within the first iteration of the N1Loop1, within second transaction in the first functional group and interchange.

You can also make use of XPath conditional statements to locate the first element which matches a name=value. For example, you could use the following XPath to locate the path of the first element within any N1Loop1 that has a name=N101 and value=BT: EDIReader.XPath = "IX[1]/FG[1]/TX[1]/N1Loop1[N101='BT']";

Note that the conditional statements will search the children, but not the grand children of the element on which the conditional statement is applied. For instance in the above example the children of N1Loop1 will be searched, but the grandchildren will not.

Additionally if the schema loaded is a ArcESB JSON schema the element Id (from the schema) can be used in the conditional statement. For instance instead of N101 the following is also acceptable: EDIReader.XPath = "IX[1]/FG[1]/TX[1]/N1Loop1[98='BT']";

Input Properties

The control will determine the source of the input based on which properties are set.

The order in which the input properties are checked is as follows:

• InputFile
• InputData

When a valid source is found the search stops.

InputData Notes

When setting data to parse via InputData fragments or complete documents may be specified. To parse data in chunks set InputData and call Parse for each fragment.

When the parser is finally reset via the Reset method, all buffered text is flushed out through the ExtraData property.

Since the control can be used to parse EDI data fragments, the internal buffer will not be cleared until Reset is called. If you plan to use this method to parse multiple complete EDI documents be sure to call Reset between calls.

Reset Method (VDAReader Control)

Resets the parser.

Syntax

vdareadercontrol.Reset 

Remarks

When called, the parser flushes all its buffers, firing events as necessary, and then initializes itself to its default state.

Reset must also be used as signal to the parser that the current stream of text has terminated.

TryXPath Method (VDAReader Control)

Navigates to the specified XPath if it exists.

Syntax

vdareadercontrol.TryXPath xpath

Remarks

This method will attempt to navigate to the specified XPath parameter if it exists within the document.

If the XPath exists the XPath property will be updated and this method returns True.

If the XPath does not exist the XPath property is not updated and this method returns False.

EndFunctionalGroup Event (VDAReader Control)

Fires whenever a control segment is read that marks the end of an interchange.

Syntax

Sub vdareadercontrol_EndFunctionalGroup(Tag As String, ControlNumber As String, Count As Integer, FullSegment As String)

Remarks

The EndFunctionalGroup event will fire when a control segment marking the end of a functional group is read. The Tag parameter contains the tag of the segment, such as GE. ControlNumber contains the control number associated with the segment, and links this event with the corresponding StartFunctionalGroup event. Count contains the value of the count element included in the closing segment, which identifies the number of transactions in a functional group.

EndInterchange Event (VDAReader Control)

Fires whenever a control segment is read that marks the end of an interchange.

Syntax

Sub vdareadercontrol_EndInterchange(Tag As String, ControlNumber As String, FullSegment As String)

Remarks

The EndInterchange event will fire when a control segment marking the end of an interchange is read. The Tag parameter contains the tag of the segment, such as IEA. ControlNumber contains the control number associated with the segment, and links this event with the corresponding StartInterchange event.

EndLoop Event (VDAReader Control)

Fires when the end of a loop is detected in a transaction set.

Syntax

Sub vdareadercontrol_EndLoop()

Remarks

The EndLoop event will fire after the last segment in a loop is read. Each EndLoop event is paired with one StartLoop event.

EndTransaction Event (VDAReader Control)

Fires whenever a control segment is read that marks the end of a transaction.

Syntax

Sub vdareadercontrol_EndTransaction(Tag As String, ControlNumber As String, Count As Integer, FullSegment As String)

Remarks

The EndTransaction event will fire when a control segment marking the end of a transaction is read. The Tag parameter contains the tag of the segment, such as SE. ControlNumber contains the control number associated with the segment, and links this event with the corresponding StartTransaction event. Count contains the value of the count element included in the closing segment, which identifies the number of segments in a transaction set.

Error Event (VDAReader Control)

Fired when information is available about errors during data delivery.

Syntax

Sub vdareadercontrol_Error(ErrorCode As Integer, Description As String)

Remarks

The Error event is fired in case of exceptional conditions during message processing. Normally the control fails with an error.

The ErrorCode parameter contains an error code, and the Description parameter contains a textual description of the error. For a list of valid error codes and their descriptions, please refer to the Error Codes section.

ResolveSchema Event (VDAReader Control)

Fires whenever a new transaction set is encountered and no schema is found for it.

Syntax

Sub vdareadercontrol_ResolveSchema(TransactionCode As String, StandardVersion As String)

Remarks

The ResolveSchema event will fire when a the control encounters the header segment of a new transaction set, but it finds no schema corresponding to it already loaded.

TransactionCode contains the code of the transaction, such as "810" or "APERAK".

StandardVersion contains the version of the transaction, such as "004010" or "D95A".

When processing this event, the caller can use LoadSchema() to load a new schema into the control that can be used to parse the transaction.

After the event fires, if the control still doesn't have a matching schema, then it will attempt schema-less parsing of the transaction set.

Segment Event (VDAReader Control)

Fires whenever a data segment in a transaction set is read.

Syntax

Sub vdareadercontrol_Segment(Tag As String, Name As String, LoopName As String, FullSegment As String)

Remarks

The Segment event will fire when a data segment is read. The Tag parameter contains the tag of the segment. Name contains the name of the segment as defined in the associated transaction set schema. LoopName contains the name of the loop or group this segment is present in (such as N1Loop1).

StartFunctionalGroup Event (VDAReader Control)

Fires whenever a control segment is read that marks the start of a functional group.

Syntax

Sub vdareadercontrol_StartFunctionalGroup(Tag As String, ControlNumber As String, FullSegment As String)

Remarks

The StartFunctionalGroup event will fire when a control segment marking the start of a functional group structure is read. The Tag parameter contains the tag of the segment, such as GS. ControlNumber contains the control number associated with the segment.

StartInterchange Event (VDAReader Control)

Fires whenever a control segment is read that marks the start of an interchange.

Syntax

Sub vdareadercontrol_StartInterchange(Tag As String, ControlNumber As String, FullSegment As String)

Remarks

The StartInterchange event will fire when a control segment marking the start of an interchange structure is read. The Tag parameter contains the tag of the segment, such as ISA. ControlNumber contains the control number associated with the segment.

StartLoop Event (VDAReader Control)

Fires when the starting of a loop is detected in a transaction set.

Syntax

Sub vdareadercontrol_StartLoop(Name As String)

Remarks

The StartLoop event will fire when the tag of a loop trigger segment is read. The Name parameter contains the schema-provided name of the loop, such as "N1Loop1".

StartTransaction Event (VDAReader Control)

Fires whenever a control segment is read that marks the start of a transaction.

Syntax

Sub vdareadercontrol_StartTransaction(Tag As String, ControlNumber As String, Code As String, FullSegment As String)

Remarks

The StartTransaction event will fire when a control segment marking the start of a transaction is read. The Tag parameter contains the tag of the segment, such as ST. ControlNumber contains the control number associated with the segment. Code contains the transaction code (such as 810).

Warning Event (VDAReader Control)

Fires whenever a validation warning is encountered.

Syntax

Sub vdareadercontrol_Warning(WarnCode As Integer, Message As String, SegmentNumber As Integer, SegmentTag As String, TechnicalErrorCode As String, SegmentErrorCode As String, ElementErrorCode As String, ElementPosition As Integer)

Remarks

The Warning event will fire during parsing of a segment of an EDI document. The WarnCode parameter contains the type of warning encountered. Message is a textual description of the problem. SegmentNumber is the index of the segment where the problem was found.

SegmentTag holds the tag name of the segment. SegmentErrorCode holds the error code that may be used in the IK304 field of a 999. ElementErrorCode holds the error code that may be used in the IK403 field of a 999. ElementPosition is the position of the element where the error occurred.

It's very important to note that segment validation happens right in the middle of the parsing process. Because of this, the Warning event will usually fire long before the validated segment becomes the current segment for the parser state. This means you cannot access the parser properties to examine the current segment in relation with the Warning event when the event fires.

Possible WarnCode values are:

TechnicalErrorCode holds a technical error code that helps identify structural issues with the document. For instance when parsing an X12 document this will hold values that may be used for TA1 error codes. When parsing X12 documents the following codes are applicable:

Config Settings (VDAReader Control)

The control accepts one or more of the following configuration settings. Configuration settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the control, access to these internal properties is provided through the Config method.

VDAREADER Config Settings

Base Config Settings

Trappable Errors (VDAReader Control)

VDAReader Errors

	21001    Input/Output error
	21002    No stream or file name were specified for the component
	21003    Unexpected end of file (EOF).
	21004    Segment not found.
	21005    Segment not found in schema.
	21006    Schema not found.
	21011    Invalid Writer state.
	21012    Segment does not have the specified element or component.
	21013    Invalid XPath.
	21014    DOM tree unavailable (set BuildDOM and reparse).
	21015    Document contains incomplete segments.
	21016    Document contains an open EDI structure (interchange, functional group or transaction) with no matching footer segment.
	21045    Error while reading schema file.
	21101    Component is busy.
	21100    Unexpected error.