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

定義

引發 Error 事件。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)

參數

e
EventArgs EventArgs EventArgs EventArgs

包含事件資料的 EventArgsAn EventArgs that contains the event data.

範例

下列程式碼範例將示範使用OnError方法的可能方式。The following code example demonstrates a possible way to use of the OnError method. 它會建立一個字串, 其中包含一些不正確引數, 這會導致例外狀況。It creates a string with some arguments that are not valid, which leads to an exception. 因為類別是抽象類別, 所以這個程式碼範例是Page使用衍生自TemplateControl類別的類別來撰寫。 TemplateControlBecause 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>  

適用於