BindingManagerBase.CurrentChanged 事件

在当前绑定项更改时发生。

**命名空间:**System.Windows.Forms
**程序集:**System.Windows.Forms（在 system.windows.forms.dll 中）

语法

声明
Public Event CurrentChanged As EventHandler
用法
Dim instance As BindingManagerBase
Dim handler As EventHandler

AddHandler instance.CurrentChanged, handler

public event EventHandler CurrentChanged

public:
event EventHandler^ CurrentChanged {
    void add (EventHandler^ value);
    void remove (EventHandler^ value);
}

/** @event */
public void add_CurrentChanged (EventHandler value)

/** @event */
public void remove_CurrentChanged (EventHandler value)

JScript 支持使用事件，但不支持进行新的声明。

备注

每当 Current 属性发生更改，或发生 CurrentItemChanged 事件时，都会引发 CurrentChanged 事件。

有关处理事件的更多信息，请参见 使用事件。

示例

下面的代码示例输出 CurrentChanged 事件中的 BindingManagerBase 中 Current 对象的值。 该示例假定数据源是一个包含名为 CustName 的 DataColumn 的 DataTable。

Private Sub Current_Changed(sender As Object, e As EventArgs)
    Dim bm As BindingManagerBase = CType(sender, BindingManagerBase)
    ' Check the type of the Current object. If it is not a
    ' DataRowView, exit the method. 
    If Not bm.Current.GetType() Is GetType(DataRowView) Then
        Return
    End If 
    ' Otherwise, print the value of the column named "CustName".
    Dim drv As DataRowView = CType(bm.Current, DataRowView)
    Console.Write("CurrentChanged): ")
    Console.Write(drv("CustName"))
    Console.WriteLine()
End Sub 'Current_Changed

private void Current_Changed(object sender, EventArgs e)
{
    BindingManagerBase bm = (BindingManagerBase) sender;
    /* Check the type of the Current object. If it is not a 
    DataRowView, exit the method. */
    if(bm.Current.GetType() != typeof(DataRowView)) return;

    // Otherwise, print the value of the column named "CustName".
    DataRowView drv = (DataRowView) bm.Current;
    Console.Write("CurrentChanged): ");
    Console.Write(drv["CustName"]);
    Console.WriteLine();
}

void Current_Changed( Object^ sender, EventArgs^ /*e*/ )
{
   BindingManagerBase^ bm = dynamic_cast<BindingManagerBase^>(sender);
   
   /* Check the type of the Current object. If it is not a 
           DataRowView, exit the method. */
   if ( bm->Current->GetType() != DataRowView::typeid )
         return;

   // Otherwise, print the value of the column named "CustName".
   DataRowView^ drv = dynamic_cast<DataRowView^>(bm->Current);
   Console::Write( "CurrentChanged): " );
   Console::Write( drv[ "CustName" ] );
   Console::WriteLine();
}

private void Current_Changed(Object sender, EventArgs e)
{
    BindingManagerBase bm = (BindingManagerBase)sender;
    /* Check the type of the Current object. If it is not a 
       DataRowView, exit the method. 
     */
    if (!bm.get_Current().GetType().Equals(DataRowView.class.ToType())) {
        return;
    }
    // Otherwise, print the value of the column named "CustName".
    DataRowView drv = (DataRowView)(bm.get_Current());
    Console.Write("CurrentChanged): ");
    Console.Write(drv.get_Item("CustName"));
    Console.WriteLine();
} //Current_Changed

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

BindingManagerBase 类
BindingManagerBase 成员
System.Windows.Forms 命名空间
OnCurrentChanged
PositionChanged
CurrentItemChanged
BindingManagerBase.Current 属性