تحرير

مشاركة عبر

CurrencyManager.ListChanged Event

  • Reference

Definition

Namespace:
System.Windows.Forms
Assembly:
System.Windows.Forms.dll

Occurs when the list changes or an item in the list changes.

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

Event Type

ListChangedEventHandler

Examples

The following code example demonstrates the use of this member. In the example, an event handler reports on the occurrence of the ListChanged event. This report helps you to learn when the event occurs and can assist you in debugging. 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.

To run the example code, paste it into a project that contains an instance of type CurrencyManager named CurrencyManager1. 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

Remarks

The ListChanged event is thrown by the CurrencyManager class when changes to an item are made using methods such as EndCurrentEdit, CancelCurrentEdit, and Refresh. This event can also occur when the data source is edited directly if it implements the IBindingListView interface.

The associated OnListChanged method is a private method in this class.

For more information about handling events, see Handling and Raising Events.

Applies to

See also