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

Initializes a new instance of the DataRelation class using the specified DataRelation name and matched arrays of parent and child DataColumn objects.

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

public DataRelation (
	string relationName,
	DataColumn[] parentColumns,
	DataColumn[] childColumns
)
public DataRelation (
	String relationName, 
	DataColumn[] parentColumns, 
	DataColumn[] childColumns
)
public function DataRelation (
	relationName : String, 
	parentColumns : DataColumn[], 
	childColumns : DataColumn[]
)

Parameters

relationName

The name of the relation. If a null reference (Nothing in Visual Basic) or an empty string (""), a default name will be given when the created object is added to the DataRelationCollection.

parentColumns

An array of parent DataColumn objects.

childColumns

An array of child DataColumn objects.

Exception typeCondition

ArgumentNullException

One or both of the DataColumn objects contains a null reference (Nothing in Visual Basic).

InvalidConstraintException

The DataColumn objects have different data types

-Or-

One or both of the arrays are not composed of distinct columns from the same table.

-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")

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

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

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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