TextBoxBase.ReadOnlyChanged 事件


ReadOnly 属性的值更改后发生。Occurs when the value of the ReadOnly property has changed.

 event EventHandler ^ ReadOnlyChanged;
public event EventHandler ReadOnlyChanged;
member this.ReadOnlyChanged : EventHandler 
Public Custom Event ReadOnlyChanged 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,事件处理程序报告事件的发生 ReadOnlyChangedIn the example, an event handler reports on the occurrence of the ReadOnlyChanged 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 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.

若要运行示例代码,请将其粘贴到一个项目中,该项目包含从继承的类型的实例 TextBoxBase ,如 TextBoxTextBoxBaseTo run the example code, paste it into a project that contains an instance of a type that inherits from TextBoxBase, such as a TextBox or TextBoxBase. 然后命名该实例 TextBoxBase1 ,并确保事件处理程序与事件相关联 ReadOnlyChangedThen name the instance TextBoxBase1 and ensure that the event handler is associated with the ReadOnlyChanged event.

private void TextBoxBase1_ReadOnlyChanged(Object sender, EventArgs e) {

   MessageBox.Show("You are in the TextBoxBase.ReadOnlyChanged event.");
Private Sub TextBoxBase1_ReadOnlyChanged(sender as Object, e as EventArgs) _ 
     Handles TextBoxBase1.ReadOnlyChanged

   MessageBox.Show("You are in the TextBoxBase.ReadOnlyChanged event.")

End Sub


有关如何处理事件的详细信息,请参阅 处理和引发事件For more information about how to handle events, see Handling and Raising Events.