WebBrowser.DetachSink 方法

定义

命名空间:

System.Windows.Forms

程序集:

System.Windows.Forms.dll

从基础 ActiveX 控件中释放附加在 CreateSink() 方法中的事件处理客户端。

protected:
 override void DetachSink();

protected override void DetachSink ();

override this.DetachSink : unit -> unit

Protected Overrides Sub DetachSink ()

示例

下面的代码示例演示如何在派生自 WebBrowser 的类中使用此方法，该类使用 NavigateError OLE DWebBrowserEvents2 接口中的 事件来补充标准WebBrowser事件。

有关完整的代码示例，请参阅 CreateSink。

AxHost.ConnectionPointCookie cookie;
WebBrowser2EventHelper helper;

protected override void CreateSink()
{
    base.CreateSink();

    // Create an instance of the client that will handle the event
    // and associate it with the underlying ActiveX control.
    helper = new WebBrowser2EventHelper(this);
    cookie = new AxHost.ConnectionPointCookie(
        this.ActiveXInstance, helper, typeof(DWebBrowserEvents2));
}

protected override void DetachSink()
{
    // Disconnect the client that handles the event
    // from the underlying ActiveX control.
    if (cookie != null)
    {
        cookie.Disconnect();
        cookie = null;
    }
    base.DetachSink();
}

Private cookie As AxHost.ConnectionPointCookie
Private helper As WebBrowser2EventHelper

<PermissionSetAttribute(SecurityAction.LinkDemand, _
Name := "FullTrust")> Protected Overrides Sub CreateSink()

    MyBase.CreateSink()

    ' Create an instance of the client that will handle the event
    ' and associate it with the underlying ActiveX control.
    helper = New WebBrowser2EventHelper(Me)
    cookie = New AxHost.ConnectionPointCookie( _
        Me.ActiveXInstance, helper, GetType(DWebBrowserEvents2))
End Sub

<PermissionSetAttribute(SecurityAction.LinkDemand, _
Name := "FullTrust")> Protected Overrides Sub DetachSink()

    ' Disconnect the client that handles the event
    ' from the underlying ActiveX control.
    If cookie IsNot Nothing Then
        cookie.Disconnect()
        cookie = Nothing
    End If
    MyBase.DetachSink()

End Sub

注解

如果你熟悉使用非托管 WebBrowser ActiveX 控件进行 OLE 开发，并且想要扩展 Windows 窗体 WebBrowser 控件（ActiveX 控件的托管包装器）的功能，则此方法非常有用。 可以使用此扩展性来实现 ActiveX 控件中未由包装器控件提供的事件。

另请参阅

• CreateSink()
• WebBrowser 控件
• DWebBrowserEvents2 接口