Control.HandleCreated Control.HandleCreated Control.HandleCreated Control.HandleCreated Event

定义

在为控件创建句柄时发生。Occurs when a handle is created for the control.

public:
 event EventHandler ^ HandleCreated;
[System.ComponentModel.Browsable(false)]
public event EventHandler HandleCreated;
member this.HandleCreated : EventHandler 
Public Custom Event HandleCreated As EventHandler 
属性

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HandleCreated事件。In the example, an event handler reports on the occurrence of the HandleCreated 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,请将其粘贴到包含继承的类型的实例的项目Control,如ButtonComboBoxTo run the example code, paste it into a project that contains an instance of a type that inherits from Control, such as a Button or ComboBox. 然后该实例命名Control1,并确保事件处理程序相关联HandleCreated事件。Then name the instance Control1 and ensure that the event handler is associated with the HandleCreated event.

private void Control1_HandleCreated(Object sender, EventArgs e) {

   MessageBox.Show("You are in the Control.HandleCreated event.");

}
Private Sub Control1_HandleCreated(sender as Object, e as EventArgs) _ 
     Handles Control1.HandleCreated

   MessageBox.Show("You are in the Control.HandleCreated event.")

End Sub

注解

当创建句柄Control显示第一次。A handle is created when the Control is displayed for the first time. 例如,如果Control将创建一个具有Visible设置为false,则HandleCreated之前将不会引发事件Visible设置为trueFor example, if a Control is created that has Visible set to false, the HandleCreated event will not be raised until Visible is set to true.

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