CurrencyManager.ListChanged 事件

定义

当列表或列表中的项更改时发生。Occurs when the list changes or an item in the list changes.

public:
 event System::ComponentModel::ListChangedEventHandler ^ ListChanged;
public event System.ComponentModel.ListChangedEventHandler ListChanged;
member this.ListChanged : System.ComponentModel.ListChangedEventHandler 
Public Custom Event ListChanged As ListChangedEventHandler 

示例

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 ListChanged 事件的发生。In the example, an event handler reports on the occurrence of the ListChanged 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,请将其粘贴到包含名为 CurrencyManager1CurrencyManager 类型实例的项目中。To run the example code, paste it into a project that contains an instance of type CurrencyManager named CurrencyManager1. 然后,确保事件处理程序与 ListChanged 事件关联。Then ensure that the event handler is associated with the ListChanged event.

private void CurrencyManager1_ListChanged(Object sender, ListChangedEventArgs e) {

System.Text.StringBuilder messageBoxCS = new System.Text.StringBuilder();
messageBoxCS.AppendFormat("{0} = {1}", "ListChangedType", e.ListChangedType );
messageBoxCS.AppendLine();
messageBoxCS.AppendFormat("{0} = {1}", "NewIndex", e.NewIndex );
messageBoxCS.AppendLine();
messageBoxCS.AppendFormat("{0} = {1}", "OldIndex", e.OldIndex );
messageBoxCS.AppendLine();
messageBoxCS.AppendFormat("{0} = {1}", "PropertyDescriptor", e.PropertyDescriptor );
messageBoxCS.AppendLine();
MessageBox.Show(messageBoxCS.ToString(), "ListChanged Event" );
}
Private Sub CurrencyManager1_ListChanged(sender as Object, e as ListChangedEventArgs) _ 
     Handles CurrencyManager1.ListChanged

    Dim messageBoxVB as New System.Text.StringBuilder()
    messageBoxVB.AppendFormat("{0} = {1}", "ListChangedType", e.ListChangedType)
    messageBoxVB.AppendLine()
    messageBoxVB.AppendFormat("{0} = {1}", "NewIndex", e.NewIndex)
    messageBoxVB.AppendLine()
    messageBoxVB.AppendFormat("{0} = {1}", "OldIndex", e.OldIndex)
    messageBoxVB.AppendLine()
    messageBoxVB.AppendFormat("{0} = {1}", "PropertyDescriptor", e.PropertyDescriptor)
    messageBoxVB.AppendLine()
    MessageBox.Show(messageBoxVB.ToString(),"ListChanged Event")

End Sub

注解

当使用 EndCurrentEditCancelCurrentEditRefresh等方法更改项时,CurrencyManager 类将引发 ListChanged 事件。The ListChanged event is thrown by the CurrencyManager class when changes to an item are made using methods such as EndCurrentEdit, CancelCurrentEdit, and Refresh. 如果直接编辑数据源(如果它实现 IBindingListView 接口),则也可能发生此事件。This event can also occur when the data source is edited directly if it implements the IBindingListView interface.

关联的 OnListChanged 方法是此类中的私有方法。The associated OnListChanged method is a private method in this class.

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.

适用于

另请参阅