ControlAdapter.OnInit(EventArgs) 方法

protected public:
 virtual void OnInit(EventArgs ^ e);

protected internal virtual void OnInit(EventArgs e);

abstract member OnInit : EventArgs -> unit
override this.OnInit : EventArgs -> unit

Protected Friend Overridable Sub OnInit (e As EventArgs)

参数

示例

下面的代码示例从 ControlAdapter 类派生自定义控件适配器。 然后，它会重写 OnInit 方法以在关联的控件上设置属性，并调用基方法以完成控件初始化。

#using <System.Web.dll>
#using <System.dll>

using namespace System;
using namespace System::Web::UI;
using namespace System::Web::UI::Adapters;

public ref class CustomControlAdapter: public ControlAdapter
{
   // Override the ControlAdapter default OnInit implementation.
protected:
   virtual void OnInit( EventArgs^ e ) override
   {
      // Make the control invisible.
      Control->Visible = false;
      
      // Call the base method, which calls OnInit of the control,
      // which raises the control Init event.
      ControlAdapter::OnInit( e );
   }
};

using System;
using System.Web.UI;
using System.Web.UI.Adapters;

public class CustomControlAdapter : ControlAdapter
{
    // Override the ControlAdapter default OnInit implementation.
    protected override void OnInit (EventArgs e)
    {
        // Make the control invisible.
        Control.Visible = false;

        // Call the base method, which calls OnInit of the control,
        // which raises the control Init event.
        base.OnInit(e);
    }
}

Imports System.Web.UI
Imports System.Web.UI.Adapters

Public Class CustomControlAdapter
    Inherits ControlAdapter

    ' Override the ControlAdapter default OnInit implementation.
    Protected Overrides Sub OnInit(ByVal e As EventArgs)

        ' Make the control invisible.
        Control.Visible = False

        ' Call the base method, which calls OnInit of the control, 
        ' which raises the control Init event.
        MyBase.OnInit(e)

    End Sub
End Class

注解

如果存在附加到 Control 对象的适配器，并且 OnInit 重写了该方法，则会调用替代方法，而不是 Control.OnInit 方法。

重写 OnInit 以在 Initialize 控制生命周期的阶段执行特定于目标的处理。 通常，这些函数是在创建控件时执行的。

继承者说明

从 ControlAdapter 类继承并适配器重写 OnInit(EventArgs) 该方法时，适配器必须调用相应的基类方法，后者又会调用该方法 OnInit(EventArgs) 。 OnInit(EventArgs)如果未调用该方法，Init则不会引发该事件。

另请参阅

• Init
• OnInit(EventArgs)
• Control