System.Data.Common Namespace   DataTableMappingCollection Class

Checks whether a DataTableMapping with the given source table name exists in the collection.

[ VB ]
NotOverridable Overloads Public Function Contains ( _
   ByVal sourceTable ( ) As String _
) As Boolean Implements ITableMappingCollection.Contains

[ C# ]
public bool Contains (
   string sourceTable
);

[ C++ ]
public: __sealed bool Contains (
   String* sourceTable
);

[ JScript ]
public function Contains (
   sourceTable : String
) : Boolean

sourceTable

The case-sensitive name of a SourceTable to find.

This method returns only a boolean value: true if the collection contains a DataTableMapping with the specified source table name; otherwise, false.

ITableMappingCollection.Contains

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

The following example searches for a DataTableMapping object with the given source table name within a DataTableMappingCollection. If the DataTableMapping exists, the code displays the name and index of the mapping; otherwise, it displays an error.

public void FindDataTableMapping ( DataAdapter myAdapter ) {
   // get table mappings
   DataTableMappingCollection myTables = myAdapter.TableMappings;
   if ( myTables.Contains ( "Employees" ) ) {
      MessageBox.Show ( "Name: " + myTables [ "Employees" ].ToString ( )
         + "\nIndex: " + myTables.IndexOf ( "Employees" ).ToString ( ) );
   } else {
      MessageBox.Show ( "Error: no such table in collection" );
   }
}

Public Sub FindDataTableMapping ( ByVal myAdapter As DataAdapter )
   ' get table mappings
   Dim myTables As DataTableMappingCollection = myAdapter.TableMappings;
   If myTables.Contains ( "Employees" ) Then
      MessageBox.Show ( "Name: " + myTables ( "Employees" ).ToString ( ) _
         + ControlChars.Cr + "Index: " + myTables.IndexOf ( "Employees" ).ToString ( ) )
   Else
      MessageBox.Show ( "Error: no such table in collection" )
   End If
End Sub

DataTableMappingCollection Members   DataTableMappingCollection.Contains Overload List