Control.HandleCreated 事件

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 HandleCreated 事件的发生。In the example, an event handler reports on the occurrence of the HandleCreated 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,请考虑将 MessageBox.Show 替换为 Console.WriteLine 或将消息附加到多行 TextBox中。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,请将其粘贴到一个项目中,该项目包含继承自 Control的类型的实例,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,将该实例命名为 Control1 并确保事件处理程序与 HandleCreated 事件关联。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

第一次显示 Control 时,将创建一个句柄。A handle is created when the Control is displayed for the first time. 例如,如果创建了一个 Visible 设置为 falseControl,则在 Visible 设置为 true之前,将不会引发 HandleCreated 事件。For 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