DataTable.RowDeleting 事件

在表中的行要被删除之前发生。

**命名空间:**System.Data
**程序集:**System.Data（在 system.data.dll 中）

语法

声明
Public Event RowDeleting As DataRowChangeEventHandler
用法
Dim instance As DataTable
Dim handler As DataRowChangeEventHandler

AddHandler instance.RowDeleting, handler

public event DataRowChangeEventHandler RowDeleting

public:
event DataRowChangeEventHandler^ RowDeleting {
    void add (DataRowChangeEventHandler^ value);
    void remove (DataRowChangeEventHandler^ value);
}

/** @event */
public void add_RowDeleting (DataRowChangeEventHandler value)

/** @event */
public void remove_RowDeleting (DataRowChangeEventHandler value)

JScript 支持使用事件，但不支持进行新的声明。

备注

有关更多信息，请参见 使用 DataTable 事件。

示例

Private Shared Sub DataTableRowDeleting()
    Dim customerTable As DataTable = New DataTable("Customers")
    ' add columns
    customerTable.Columns.Add( "id", Type.GetType("System.Int32"))
    customerTable.Columns.Add( "name", Type.GetType("System.String"))
    customerTable.Columns.Add( "address", Type.GetType("System.String"))

    ' set PrimaryKey
    customerTable.Columns( "id").Unique = true
    customerTable.PrimaryKey = New DataColumn() { customerTable.Columns("id") }

    ' add a RowDeleting event handler for the table.
    AddHandler customerTable.RowDeleting, New _
        DataRowChangeEventHandler( AddressOf Row_Deleting )


    ' add ten rows
    Dim id As Integer
    For id = 1 To 10
        customerTable.Rows.Add( _
            New Object() { id, string.Format("customer{0}", id), _
            string.Format("address{0}", id) })
    Next
    
    customerTable.AcceptChanges()

    ' Delete all the rows
    Dim row As DataRow
    For Each row In customerTable.Rows 
        row.Delete()
    Next
End Sub

Private Shared Sub Row_Deleting(sender As Object, _
    e As DataRowChangeEventArgs)
    Console.WriteLine( "Row_Deleting Event: name={0}; action={1}", _
        e.Row("name"), e.Action) 
End Sub

private static void DataTableRowDeleting()
{
    DataTable customerTable = new DataTable("Customers");
    // add columns
    customerTable.Columns.Add( "id", typeof(int));
    customerTable.Columns.Add( "name", typeof(string));
    customerTable.Columns.Add( "address", typeof(string));

    // set PrimaryKey
    customerTable.Columns[ "id" ].Unique = true;
    customerTable.PrimaryKey = new DataColumn[] 
        { customerTable.Columns["id"] };

    // add a RowDeleting event handler for the table.
    customerTable.RowDeleting += new DataRowChangeEventHandler( Row_Deleting );


    // add ten rows
    for( int id=1; id<=10; id++)
    {
        customerTable.Rows.Add( 
            new object[] { id, string.Format("customer{0}", id), 
            string.Format("address{0}", id) });
    }

    customerTable.AcceptChanges();

    // Delete all the rows
    foreach( DataRow row in customerTable.Rows )
        row.Delete();
}

private static void Row_Deleting( object sender, 
    DataRowChangeEventArgs e )
{
    Console.WriteLine( "Row_Deleting Event: name={0}; action={1}", 
        e.Row["name"], e.Action );
}

平台

Windows 98、Windows 2000 SP4、Windows CE、Windows Millennium Edition、Windows Mobile for Pocket PC、Windows Mobile for Smartphone、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition

.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。

版本信息

.NET Framework

受以下版本支持：2.0、1.1、1.0

.NET Compact Framework

受以下版本支持：2.0、1.0

请参见

参考

DataTable 类
DataTable 成员
System.Data 命名空间

其他资源

创建和使用 DataTables