HtmlElementEventHandler HtmlElementEventHandler HtmlElementEventHandler HtmlElementEventHandler Delegate

定义

表示将处理 HtmlDocumentHtmlElementHtmlWindow 上的 ClickMouseDown 和相关事件的方法。Represents the method that will handle the Click, MouseDown and related events on HtmlDocument, HtmlElement, and HtmlWindow.

public delegate void HtmlElementEventHandler(System::Object ^ sender, HtmlElementEventArgs ^ e);
public delegate void HtmlElementEventHandler(object sender, HtmlElementEventArgs e);
type HtmlElementEventHandler = delegate of obj * HtmlElementEventArgs -> unit
Public Delegate Sub HtmlElementEventHandler(sender As Object, e As HtmlElementEventArgs)

参数

sender
Object Object Object Object

事件源。The source of the event.

继承
HtmlElementEventHandlerHtmlElementEventHandlerHtmlElementEventHandlerHtmlElementEventHandler

示例

下面MouseDown的代码附加上MouseMove MouseUp 的、和事件的事件处理程序HtmlDocumentThe following code attaches event handlers for the MouseDown, MouseMove, and MouseUp events on HtmlDocument. 此代码示例假定你的项目包含一个名为WebBrowser WebBrowser1的控件的实例。This code sample assumes your project has an instance of the WebBrowser control named WebBrowser1.

private:
   void webBrowser1_DocumentCompleted( Object^ /*sender*/, System::Windows::Forms::WebBrowserDocumentCompletedEventArgs^ /*e*/ )
   {
      WebBrowser1->Document->MouseDown += gcnew HtmlElementEventHandler( this, &Form1::Document_MouseDown );
      WebBrowser1->Document->MouseMove += gcnew HtmlElementEventHandler( this, &Form1::Document_MouseMove );
      WebBrowser1->Document->MouseUp += gcnew HtmlElementEventHandler( this, &Form1::Document_MouseUp );
   }

   void Document_MouseDown( Object^ /*sender*/, HtmlElementEventArgs^ /*e*/ )
   {
      // Insert your code here.
   }

   void Document_MouseMove( Object^ /*sender*/, HtmlElementEventArgs^ /*e*/ )
   {
      // Insert your code here.
   }

   void Document_MouseUp( Object^ /*sender*/, HtmlElementEventArgs^ /*e*/ )
   {
      // Insert your code here.
   }
private void webBrowser1_DocumentCompleted(object sender, System.Windows.Forms.WebBrowserDocumentCompletedEventArgs e)
{
	WebBrowser1.Document.MouseDown += new HtmlElementEventHandler(Document_MouseDown);
	WebBrowser1.Document.MouseMove += new HtmlElementEventHandler(Document_MouseMove);
	WebBrowser1.Document.MouseUp += new HtmlElementEventHandler(Document_MouseUp);
}

private void Document_MouseDown(object sender, HtmlElementEventArgs e)
{
	// Insert your code here.
}

private void Document_MouseMove(object sender, HtmlElementEventArgs e)
{
	// Insert your code here.
}

private void Document_MouseUp(object sender, HtmlElementEventArgs e)
{
	// Insert your code here.
}
Private Sub WebBrowser1_DocumentCompleted(ByVal sender As Object, ByVal e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs) Handles WebBrowser1.DocumentCompleted
    Dim Doc As HtmlDocument = WebBrowser1.Document

    AddHandler Doc.MouseDown, New HtmlElementEventHandler(AddressOf Document_MouseDown)
    AddHandler Doc.MouseMove, New HtmlElementEventHandler(AddressOf Document_MouseMove)
    AddHandler Doc.MouseUp, New HtmlElementEventHandler(AddressOf Document_MouseUp)
End Sub

Private Sub Document_MouseDown(ByVal sender As Object, ByVal e As HtmlElementEventArgs)
    ' Insert your code here.
End Sub

Private Sub Document_MouseMove(ByVal sender As Object, ByVal e As HtmlElementEventArgs)
    ' Insert your code here.
End Sub

Private Sub Document_MouseUp(ByVal sender As Object, ByVal e As HtmlElementEventArgs)
    ' Insert your code here.
End Sub

注解

创建 HtmlElementEventHandler 委托时,需要标识将处理该事件的方法。When you create a HtmlElementEventHandler delegate, you identify the method that will handle the event. 若要将事件与事件处理程序关联,请将该委托的一个实例添加到事件中。To associate the event with your event handler, add an instance of the delegate to the event. 除非移除了该委托,否则每当发生该事件时就会调用事件处理程序。The event handler is called whenever the event occurs, unless you remove the delegate. 有关事件处理程序委托的详细信息, 请参阅处理和引发事件For more information about event handler delegates, see Handling and Raising Events.

您必须等到 HTML 文档加载完成后, 才能将事件处理程序附加到文档。You must wait until an HTML document has finished loading in order to attach an event handler to the document. 如果尝试在加载完成之前附加处理程序, 则附加操作可能会失败。If you attempt to attach a handler before loading has completed, the attach operation may fail. 将事件处理程序附加到新文档中的最佳位置是在DocumentCompleted WebBrowser控件的事件处理程序中。The best place to attach event handlers in a new document is in the DocumentCompleted event handler for the WebBrowser control.

扩展方法

GetMethodInfo(Delegate) GetMethodInfo(Delegate) GetMethodInfo(Delegate) GetMethodInfo(Delegate)

获取指示指定委托表示的方法的对象。Gets an object that represents the method represented by the specified delegate.

适用于