UniqueConstraint.Columns Property
Definition
Important
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Gets the array of columns that this constraint affects.
public:
virtual property cli::array <System::Data::DataColumn ^> ^ Columns { cli::array <System::Data::DataColumn ^> ^ get(); };public virtual System.Data.DataColumn[] Columns { get; }[System.Data.DataSysDescription("KeyConstraintColumnsDescr")]
public virtual System.Data.DataColumn[] Columns { get; }member this.Columns : System.Data.DataColumn[][<System.Data.DataSysDescription("KeyConstraintColumnsDescr")>]
member this.Columns : System.Data.DataColumn[]Public Overridable ReadOnly Property Columns As DataColumn()Property Value
An array of DataColumn objects.
- Attributes
Examples
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
