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ForeignKeyConstraint.Columns Property

Gets the child columns of this constraint.

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

public virtual DataColumn[] Columns { get; }

Property Value

Type: System.Data.DataColumn[]
An array of DataColumn objects that are the child columns of the constraint.

The following example returns an array of DataColumn objects through the Columns property.

Private Sub GetColumns()
   Dim dataColumns() As DataColumn
   Dim relation As DataRelation
   Dim i As Integer  
   ' Get the DataRelation from a DataSet. 
   For Each relation In DataSet1.Relations
      If relation.GetType.ToString = _
        "System.Data.ForeignKeyConstraint" Then
        dataColumns = relation.ParentColumns
           For i = 0 To dataColumns.GetUpperBound(0)
              Console.WriteLine(dataColumns(i).ColumnName)
           Next i
      End If 
   Next 
End Sub

.NET Framework

Supported in: 4.5.3, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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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