CurrencyManager.ListChanged CurrencyManager.ListChanged CurrencyManager.ListChanged CurrencyManager.ListChanged Event

定义

当列表更改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将此成员。The following code example demonstrates the use of this member. 在示例中,事件处理程序报告的匹配项ListChanged事件。In the example, an event handler reports on the occurrence of the ListChanged event. 此报告可帮助您了解事件发生的并可以帮助您进行调试。This report helps you to learn when the event occurs and can assist you in debugging. 若要报告或频繁发生的事件上多个事件,请考虑更换MessageBox.ShowConsole.WriteLine或将消息附加到多行TextBoxTo 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.

若要运行此代码示例,请将其粘贴到包含类型的实例的项目CurrencyManager名为CurrencyManager1To run the example code, paste it into a project that contains an instance of type CurrencyManager named CurrencyManager1. 然后,确保事件处理程序相关联ListChanged事件。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

ListChanged事件引发的CurrencyManager类使用以下方法进行更改的项时EndCurrentEditCancelCurrentEdit,和RefreshThe ListChanged event is thrown by the CurrencyManager class when changes to an item are made using methods such as EndCurrentEdit, CancelCurrentEdit, and Refresh. 如果它实现了直接编辑数据源时,也会发生此事件IBindingListView接口。This event can also occur when the data source is edited directly if it implements the IBindingListView interface.

关联OnListChanged方法是在此类的私有方法。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