ListChangedEventArgs.OldIndex 属性
定义
获取已移动的项的旧索引。Gets the old index of an item that has been moved.
public:
property int OldIndex { int get(); };
public int OldIndex { get; }
member this.OldIndex : int
Public ReadOnly Property OldIndex As Integer
属性值
已移动的项的旧索引。The old index of the moved item.
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,事件处理程序报告事件的发生 BindingSource.ListChanged 。In the example, an event handler reports on the occurrence of the BindingSource.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 MessageBox.Show Console.WriteLine 将消息替换为多行或将其追加到多行 TextBox 。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的类型的实例的项目中 BindingSource BindingSource1 。To run the example code, paste it into a project that contains an instance of type BindingSource named BindingSource1. 然后,确保事件处理程序与事件相关联 BindingSource.ListChanged 。Then ensure that the event handler is associated with the BindingSource.ListChanged event.
private void BindingSource1_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 BindingSource1_ListChanged(sender as Object, e as ListChangedEventArgs) _
Handles BindingSource1.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