DataTableMappingCollection.Contains Method

Definition

Namespace:

System.Data.Common

Assembly:

System.Data.Common.dll

Gets a value indicating whether a particular DataTableMapping object exists in the collection.

Overloads

Contains(Object)	Gets a value indicating whether the given DataTableMapping object exists in the collection.
Contains(String)	Gets a value indicating whether a DataTableMapping object with the specified source table name exists in the collection.

Contains(Object)

Source:

DataTableMappingCollection.cs

Gets a value indicating whether the given DataTableMapping object exists in the collection.

public:
 virtual bool Contains(System::Object ^ value);

public bool Contains (object? value);

abstract member Contains : obj -> bool
override this.Contains : obj -> bool

Public Function Contains (value As Object) As Boolean

Parameters

value

Object

An Object that is the DataTableMapping.

Returns

Boolean

true if this collection contains the specified DataTableMapping; otherwise false.

Implements

Contains(Object)

Examples

The following example searches for a DataTableMapping within the collection. If the mapping exists in the collection, it is removed. If the mapping does not exist within the collection, it is added to the collection and its index is displayed. The example assumes that a DataTableMappingCollection collection and a DataTableMapping object have been created.

public void ChangedMyMind()
{
    // ...
    // create mappings and mapping
    // ...
    if (mappings.Contains((Object) mapping))
    {
        mappings.Remove((Object) mapping);
    }
    else
    {
        mappings.Add((Object) mapping);
        Console.WriteLine("Index of new mapping: "
            + mappings.IndexOf((Object) mapping));
    }
}

Public Sub ChangedMyMind()
    ' ...
    ' create mappings and mapping
    ' ...
    If mappings.Contains(CType(mapping, Object)) Then
        mappings.Remove(CType(mapping, Object))
    Else
        mappings.Add(CType(mapping, Object))
        Console.WriteLine("Index of new mapping: " _
           & mappings.IndexOf(CType(mapping, Object)).ToString())
    End If
End Sub

Contains(String)

Source:

DataTableMappingCollection.cs

Gets a value indicating whether a DataTableMapping object with the specified source table name exists in the collection.

public:
 virtual bool Contains(System::String ^ value);

public bool Contains (string? value);

abstract member Contains : string -> bool
override this.Contains : string -> bool

Public Function Contains (value As String) As Boolean

Parameters

value

String

The case-sensitive source table name containing the DataTableMapping object.

Returns

Boolean

true if the collection contains a DataTableMapping object with this source table name; otherwise false.

Implements

Contains(String)

Examples

The following example searches for a DataTableMapping object with the given source table name within a DataTableMappingCollection collection. If the DataTableMapping exists, the example displays the name and the index of the mapping. If the mapping does not exist, the example displays an error. This example assumes that a DataTableMappingCollection collection has been created.

public void FindDataTableMapping()
{
    // ...
    // create mappings
    // ...
    if (!mappings.Contains("Categories"))
        Console.WriteLine("Error: no such table in collection");
    else
        Console.WriteLine
            ("Name: " + mappings["Categories"].ToString() + "\n"
            + "Index: " + mappings.IndexOf("Categories").ToString());
}

Public Sub FindDataTableMapping()
    ' ...
    ' create mappings
    ' ...
    If Not mappings.Contains("Categories") Then
        Console.WriteLine("Error: no such table in collection")
    Else
        Console.WriteLine("Name: " & mappings("Categories").ToString() _
           & ControlChars.Cr + "Index: " _
           & mappings.IndexOf("Categories").ToString())
    End If
End Sub