TemplateControl.OnError(EventArgs) TemplateControl.OnError(EventArgs) TemplateControl.OnError(EventArgs) TemplateControl.OnError(EventArgs) Method

Definition

Löst das Error-Ereignis aus.Raises the Error event.

protected:
 virtual void OnError(EventArgs ^ e);
protected virtual void OnError (EventArgs e);
abstract member OnError : EventArgs -> unit
override this.OnError : EventArgs -> unit
Protected Overridable Sub OnError (e As EventArgs)

Parameter

e
EventArgs EventArgs EventArgs EventArgs

Ein EventArgs, das die Ereignisdaten enthält.An EventArgs that contains the event data.

Beispiele

Im folgenden Codebeispiel wird eine Möglichkeit veranschaulicht, wie die OnError -Methode verwendet werden kann.The following code example demonstrates a possible way to use of the OnError method. Er erstellt eine Zeichenfolge mit einigen Argumenten, die ungültig sind, was zu einer Ausnahme führt.It creates a string with some arguments that are not valid, which leads to an exception. Da die TemplateControl -Klasse eine abstrakte Klasse ist, wurde dieses Codebeispiel mithilfe der Page -Klasse geschrieben, die von der TemplateControl -Klasse abgeleitet wird.Because the TemplateControl class is an abstract class, this code example was written using the Page class, which is derived from the TemplateControl class.

<%@ Page language="VB" %>  
 <html>  
  <head>  
  <script language="VB" runat="server">  
  Sub Page_Load(sender as object, e as System.EventArgs)  
  AddHandler Page.Error, AddressOf Error_Handler  
  try  
  Dim myString as string = "Hello"  
  'An exception is raised because the length of 'myString' is less than '6'.  
  Dim mySubString as string= myString.Substring(0,6)  
  catch e1 As Exception  
  OnError (EventArgs.Empty)  
  End try  
  End Sub  
  Sub Error_Handler(sender as object,e as System.EventArgs)  
  Response.Write("<br><b>An Error was raised</b>")  
  End Sub  
  </script>  
  </head>  
 </html>  
<%@ Page language="c#" %>  
 <html>  
  <head>  
  <script language="C#" runat="server">  
  void Page_Load(object sender, System.EventArgs e)  
  {  
  Page.Error += new System.EventHandler(Error_Handler);  
  try  
  {  
  string myString = "Hello";  
  // An exception is raised because the length of 'myString' is less than '6'.  
  string mySubString = myString.Substring(0,6);  
  }  
  catch(Exception)  
  {  
  OnError(EventArgs.Empty);  
  }  
  }  
  void Error_Handler(object sender,System.EventArgs e)  
  {  
  Response.Write("<br><b>An Error was raised</b>");  
  }  
  </script>  
  </head>  
 </html>  

Gilt für: