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DataRelation Constructor (String, DataColumn[], DataColumn[], Boolean)

DataRelation Constructor (String, DataColumn[], DataColumn[], Boolean)

Initializes a new instance of the DataRelation class using the specified name, matched arrays of parent and child DataColumn objects, and value that indicates whether to create constraints.

Namespace:  System.Data
Assembly:  System.Data (in System.Data.dll)

public DataRelation(
	string relationName,
	DataColumn[] parentColumns,
	DataColumn[] childColumns,
	bool createConstraints
)

Parameters

relationName
Type: System.String

The name of the relation. If null or an empty string (""), a default name will be given when the created object is added to the DataRelationCollection.

parentColumns
Type: System.Data.DataColumn[]

An array of parent DataColumn objects.

childColumns
Type: System.Data.DataColumn[]

An array of child DataColumn objects.

createConstraints
Type: System.Boolean

A value that indicates whether to create constraints. true, if constraints are created. Otherwise, false.

ExceptionCondition
ArgumentNullException

One or both of the DataColumn objects is null.

InvalidConstraintException

The columns have different data types

-Or-

The tables do not belong to the same DataSet.

The following example creates a new DataRelation and adds it to the DataRelationCollection of a DataSet.

Private Sub CreateRelation()
    ' Code to get the DataSet not shown here. 
    ' Get the DataColumn objects from two DataTable  
    ' objects in a DataSet. 
    Dim parentColumns() As DataColumn
    Dim childColumns() As DataColumn
    parentColumns(0) = DataSet1.Tables( _
        "Customers").Columns("CustID")
    parentColumns(1) = DataSet1.Tables( _
        "Customers").Columns("OrdID")

    childColumns(0) = DataSet1.Tables( _
        "Orders").Columns("CustID")
    childColumns(1) = DataSet1.Tables( _
        "Orders").Columns("OrdID")

    Dim bConstraints As Boolean = True 
    ' Create DataRelation. 
    Dim CustOrderRel As DataRelation = New DataRelation( _
        "CustomersOrders", parentColumns, childColumns,  _
        bConstraints)

    ' Add the relation to the DataSet.
    DataSet1.Relations.Add(CustOrderRel)
End Sub

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

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