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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
)

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.
ExceptionCondition
ArgumentNullException

One or both of the DataColumn objects contains null.

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


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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

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