System.Data.Common Namespace   DataColumnMappingCollection Class

Checks whether a given DataColumnMapping object exists in the collection.

[ VB ]
NotOverridable Overloads Public Function Contains ( _
   ByVal columnMapping As Object _
) As Boolean Implements IList.Contains

[ C# ]
public bool Contains (
   object columnMapping
);

[ C++ ]
public: __sealed bool Contains (
   Object* columnMapping
);

[ JScript ]
public function Contains (
   columnMapping : Object
) : Boolean

columnMapping

A DataColumnMapping object to find.

This method returns only a boolean value: true if the collection contains a specified DataColumnMapping object; otherwise, false.

IList.Contains

Use the Contains method to confirm the existence of a column mapping object before performing further operations on the object.

The following example first uses the Contains method to determine if a particular column mapping exists in the collection. If found, the column mapping is removed with the Remove method.

private void RemoveColumnMapping ( DataTableMapping myTableMap, object myFieldMap ) {
   // get the DataColumnMappingCollection of a DataTableMapping
   DataColumnMappingCollection myFieldsMaps = myTableMap.ColumnMappings;
   if ( myFieldsMaps.Contains ( myFieldMap ) {
      myFieldsMaps.Remove ( myFieldMap );
   }
}

Private Sub RemoveColumnMapping ( myTableMap As DataTableMapping, myFieldMap As Object )
   ' get the DataColumnMappingCollection of a DataTableMapping
   Dim myFieldsMaps As DataColumnMappingCollection = myTableMap.ColumnMappings
   If myFieldsMaps.Contains ( myFieldMap ) Then
      myFieldsMaps.Remove ( myFieldMap )
   End If
End Sub

DataColumnMappingCollection Members   DataColumnMappingCollection.Contains Overload List