UniqueConstraint::Columns Property
.NET Framework (current version)
Gets the array of columns that this constraint affects.
Assembly: System.Data (in System.Data.dll)
The following example returns the DataColumn objects that the UniqueConstraint constrains.
Private Sub GetColsFromConstraint() Dim dataColumns() As DataColumn ' Get a named relation from a DataSet. Dim dataRelation As DataRelation dataRelation = DataSet1.Relations("CustomerOrders") ' Get the ParentKeyConstraint Dim uniqueConstraint As UniqueConstraint uniqueConstraint= dataRelation.ParentKeyConstraint ' Get the DataColumn objects being constrained. dataColumns = uniqueConstraint.Columns ' Print the column name of each column. Dim i As Integer For i = 0 to dataColumns.GetUpperBound(0) Console.Write(dataColumns(i).ColumnName) Next i End Sub
.NET Framework
Available since 1.1
Available since 1.1
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