UniqueConstraint.Columns UniqueConstraint.Columns UniqueConstraint.Columns UniqueConstraint.Columns Property

Definizione

Ottiene la matrice delle colonne su cui agisce questo vincolo.Gets the array of columns that this constraint affects.

public:
 virtual property cli::array <System::Data::DataColumn ^> ^ Columns { cli::array <System::Data::DataColumn ^> ^ get(); };
[System.Data.DataSysDescription("KeyConstraintColumnsDescr")]
public virtual System.Data.DataColumn[] Columns { get; }
member this.Columns : System.Data.DataColumn[]
Public Overridable ReadOnly Property Columns As DataColumn()

Valore della proprietà

Matrice di oggetti DataColumn.An array of DataColumn objects.

Esempi

Nell'esempio seguente vengono restituiti DataColumn gli oggetti vincolati UniqueConstraint da.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

Si applica a

Vedi anche