ListControl.ValueMemberChanged 事件


ValueMember 属性更改时发生。Occurs when the ValueMember property changes.

 event EventHandler ^ ValueMemberChanged;
public event EventHandler ValueMemberChanged;
member this.ValueMemberChanged : EventHandler 
Public Custom Event ValueMemberChanged As EventHandler 


下面的代码示例演示如何使用此成员。The following code example demonstrates the use of this member. 在此示例中,事件处理程序报告 ValueMemberChanged 事件的发生。In the example, an event handler reports on the occurrence of the ValueMemberChanged event. 此报表可帮助你了解何时发生事件,并可帮助你进行调试。This report helps you to learn when the event occurs and can assist you in debugging. 若要报告多个事件或频繁发生的事件,请考虑将 MessageBox.Show 替换为 Console.WriteLine 或将消息附加到多行 TextBox中。To report on multiple events or on events that occur frequently, consider replacing MessageBox.Show with Console.WriteLine or appending the message to a multiline TextBox.

若要运行示例代码,请将其粘贴到一个项目中,该项目包含继承自 ListControl的类型的实例,如 ComboBoxListBoxTo run the example code, paste it into a project that contains an instance of a type that inherits from ListControl, such as a ComboBox or ListBox. 然后,将该实例命名为 ListControl1 并确保事件处理程序与 ValueMemberChanged 事件关联。Then name the instance ListControl1 and ensure that the event handler is associated with the ValueMemberChanged event.

private void ListControl1_ValueMemberChanged(Object sender, EventArgs e) {

   MessageBox.Show("You are in the ListControl.ValueMemberChanged event.");
Private Sub ListControl1_ValueMemberChanged(sender as Object, e as EventArgs) _ 
     Handles ListControl1.ValueMemberChanged

   MessageBox.Show("You are in the ListControl.ValueMemberChanged event.")

End Sub


有关处理事件的详细信息,请参阅处理和引发事件For more information about handling events, see Handling and Raising Events.