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ÇÔ¸Õ¡ÒÃãªéÇÔ¸Õ¡Òà Page_Error

1. ·ÓµÒÁ¢Ñ鹵͹àËÅèÒ¹Õéà¾×èÍà¾ÔèÁá¿éÁãËÁè·Õèª×èÍÇèÒ PageEvent.aspx â¤Ã§¡Òâͧ¤Ø³:
   1. à»Ô´ Microsoft Visual Studio .NET
   2. â«Å٪ѹ Explorer ¤ÅÔ¡¢ÇÒ·Õèâ˹â¤Ã§¡Òà ªÕéä»·ÕèaddáÅéÇ ¤ÅÔ¡à¾ÔèÁ¿ÍÃìÁàÇçº.
   3. 㹡Òê×èÍ:¡Åèͧ¢éͤÇÒÁ ª¹Ô´PageEvent.aspxáÅéÇ ¤ÅÔ¡OPEN.
2. à¾ÔèÁÃËÑʵèÍ仹Õéà¾×èÍ PageEvent.aspx:

   <script language=C# runat="server">
   void Page_Load(object sender, System.EventArgs e)
   {
   	throw(new ArgumentNullException());
   }
   
   public void Page_Error(object sender,EventArgs e)
   {
   	Exception objErr = Server.GetLastError().GetBaseException();
   	string err =	"<b>Error Caught in Page_Error event</b><hr><br>" + 
   			"<br><b>Error in: </b>" + Request.Url.ToString() +
   			"<br><b>Error Message: </b>" + objErr.Message.ToString()+
   			"<br><b>Stack Trace:</b><br>" + 
   	                  objErr.StackTrace.ToString();
   	Response.Write(err.ToString());
   	Server.ClearError();
   }
   </script> 
   					

   
   ËÁÒÂà˵Ø:ã¹µÑÇÍÂèÒ§¹ÕéÃËÑÊ ¡ÒÃAutoEventWireupá͵·ÃÔºÔǵìäÁèä´éµÑ駡Ѻ ¶éҤسäÁèä´é¡Ó˹´¤èÒä»AutoEventWireupá͵·ÃÔºÔÇµì ¤èÒàÃÔèÁµé¹TrueÁÕãªé ¶éҤس¡ÓÅѧãªé Visual Studio .NET ¡ÒþѲ¹Òâ»Ãá¡ÃÁ»ÃÐÂØ¡µì¢Í§¤Ø³ ÃËÑʵé¹áºº¢Í§¿ÍÃìÁàÇçºä´é¡Ó˹´AutoEventWireup¤èÒá͵·ÃÔºÔǵìà·ç¨. äÁèÁÕ¤ÇÒÁᵡµèÒ§ÊӤѭÃÐËÇèÒ§¤èÒàÃÔèÁµé¹·Õèãªé ASP.NET áÅФèÒàÃÔèÁµé¹·ÕèÃËÑʵé¹áºº¢Í§ Visual Studio .NET ·Õè¡Ó˹´ãËé¡Ñºá͵·ÃÔºÔǵì¹Õé ¶éÒ¡ÒÃAutoEventWireupµÑ駤èÒá͵·ÃÔºÔǵìà»ç¹à·ç¨äÁèÁÕ´Óà¹Ô¹¡ÒõÑǨѴ¡ÒÃà˵ءÒóì·Õè»ÃСÒÈã¹à¾¨.ASPX «Öè§ÍÒ¨à»ç¹ÊѺʹËÒ¡¤Ø³äÁè·ÃÒºà¡ÕèÂǡѺ¿Ñ§¡ìªÑ¹¡Ò÷ӧҹ¹Õé
3. ¨Ò¡¹Ñé¹á¿éÁ:àÁ¹Ù ¤ÅÔ¡ºÑ¹·Ö¡ PageEvent.aspx.
4. ¤ÅÔ¡¢ÇÒ˹éÒ áÅШҡ¹Ñé¹ ¤ÅÔ¡¡ÒôÙã¹àºÃÒÇìà«ÍÃìàÁ×è͵éͧ¡ÒÃàÃÕ¡ãªéྨ¹Õé ¢ÍãËéÊѧࡵÇèÒ ÁÕ¢éͼԴ¾ÅÒ´ thrown áÅÐÃÒ§ҹµÒÁ·ÕèÁÕ¡ÒÃÃкØÃËÑÊ

ÇÔ¸Õ¡ÒÃãªéÇÔ¸Õ¡Òà Application_Error

1. à¾ÔèÁá¿éÁãËÁè·Õèª×èÍÇèÒ AppEvent.aspx â¤Ã§¡Òâͧ¤Ø³
2. à¾ÔèÁÃËÑʵèÍ仹Õéà¾×èÍ AppEvent.aspx:

   <script language=C# runat="server">
   	void Page_Load(object sender, System.EventArgs e)
   	{
   		throw(new ArgumentNullException());
   	}
   </script>
   					

   
   ËÁÒÂà˵Ø:¢éÍÁÙÅ·Õè¡ÅèÒǶ֧㹠"Page_Error"Êèǹ·Õèà¡ÕèÂǡѺ¡ÒÃAutoEventWireupá͵·ÃÔºÔǵìÂѧãªé¡ÑºµÑÇÍÂèÒ§ÃËÑÊã¹¢Ñ鹵͹¹Õé ´ÙÃÒÂÅÐàÍÕ´㹡Òà "Page_Error"ÊèǹÊÓËÃѺÃÒÂÅÐàÍÕ´à¾ÔèÁàµÔÁ
3. ¨Ò¡¹Ñé¹á¿éÁ:àÁ¹Ù ¤ÅÔ¡ºÑ¹·Ö¡ AppEvent.aspx.
4. à¾ÔèÁApplication_ErrorµÑǨѴ¡ÒÃà˵ءÒóìá¿éÁ Global.asax ä» trap ¢éͼԴ¾ÅÒ´·Õè¤Ø³ÍÂÙè¹Í¡¡Ãкǹ¡ÒÃ㹡ÒÃPage_LoadµÑǨѴ¡ÒÃà˵ءÒóì¢Í§à¾ AppEvent.aspx ¢ÍãËéÊѧࡵÇèÒ ¤Ø³µéͧà¾ÔèÁÍÕ¡¡ÒÃãªé¤ÓÊÑè§ÊÓËÃѺ¡ÒÃSystem.Diagnosticsnamespace à¾×èÍ Global.asax ¡ÒÃãªéá¿éÁºÑ¹·Ö¡à˵ءÒóì
   
   à¾ÔèÁÃËÑʵèÍ仹Õéŧã¹á¿éÁ Global.asax:

   using System.Diagnostics;
   
   protected void Application_Error(object sender, EventArgs e)
   {
   	Exception objErr = Server.GetLastError().GetBaseException();
   	string err =	"Error Caught in Application_Error event\n" +
   			"Error in: " + Request.Url.ToString() +
   			"\nError Message:" + objErr.Message.ToString()+ 
   			"\nStack Trace:" + objErr.StackTrace.ToString();
   	EventLog.WriteEntry("Sample_WebApp",err,EventLogEntryType.Error);
   	Server.ClearError();
   	//additional actions...
   } 
   					

5. ºÑ¹·Ö¡á¿éÁ Global.asax
6. ã¹ Visual Studio .NET 㹡ÒáÒÃÊÃéÒ§àÁ¹Ù ¤ÅÔ¡¡ÒÃÊÃéÒ§.
7. ¤ÅÔ¡¢ÇÒ˹éÒ áÅШҡ¹Ñé¹ ¤ÅÔ¡¡ÒôÙã¹àºÃÒÇìà«ÍÃì. In this case the page will be blank, however, you should notice that a new entry has been added in the event log. This sample makes an entry in the Application log, which is accessible from the Event Viewer. After logging the error you might want to redirect the user to another more user-friendly error page, or perform some additional actions if needed.

How to use the Web.config file

1. à»Ô´á¿éÁ Global.asax ¨Ò¡µÑÇÍÂèÒ§¡è͹˹éÒ¹Õé
2. ¢éͤԴàËç¹Í͡ẺServer.ClearErrorºÃ÷Ѵà¾×èÍãËéá¹èã¨ÇèÒ ÁÕ¢éͼԴ¾ÅÒ´ surfaces ã¹ Web.config á¿éÁ
3. Save your changes to Global.asax. Your code should now appear similar to the following:

   using System.Diagnostics;
   
   protected void Application_Error(object sender, EventArgs e)
   {
   	Exception objErr = Server.GetLastError().GetBaseException();
   	string err =	"Error Caught in Application_Error event\n" +
   			"Error in: " + Request.Url.ToString() +
   			"\nError Message:" + objErr.Message.ToString() + 
   			"\nStack Trace:" + objErr.StackTrace.ToString();
   	EventLog.WriteEntry("Sample_WebApp",err,EventLogEntryType.Error);
   	//Server.ClearError();
   	//additional actions...
   } 
   					

4. Add the following code to the <customerrors> section to redirect the user to a custom page: </customerrors>

   <customErrors defaultRedirect="http://hostName/applicationName/errorStatus.htm" mode="On">
   </customErrors>
   						

   ËÁÒÂà˵Ø:You must modify the file path indefaultRedirectattribute so that it references the relevant Web server and application names.
5. Because the errors that are trapped at this level are sent to a default error page, you must create an error page named ErrorStatus.htm. Keep in mind that you are using this method to control what is presented to the user, so this example uses an .htm page for the error page. Add the following code to ErrorStatus.htm:

   <HTML>
   <HEAD>
   <TITLE></TITLE>
   <META NAME="GENERATOR" Content="Microsoft Visual Studio 7.0">
   </HEAD>
   <BODY>
        <b>Custom Error page!</b>
        <br>
        You have been redirected here from the <customErrors> section of the 
        Web.config file.
   </BODY>
   </HTML>
   					

6. To test the code, save the files, build the project, and then view AppEvent.aspx in the browser. Notice that when the error is thrown, you are redirected to the ErrorStatus.htm page.

<customErrors defaultRedirect="http://hostName/applicationName/errorStatus.htm" mode="On">
	<error statusCode="404" redirect="filenotfound.htm" />
</customErrors>
				

• º¹: ¢éÍ¡àÇé¹ unhandled ¼Ùéãªé·Õèà»ÅÕè¹àÊ鹷ҧ价ÕèÃкØdefaultRedirect˹éÒ This mode is used mainly in production.
• »Ô´: Users receive the exception information and are not redirected to thedefaultRedirect˹éÒ This mode is used mainly in development.
• RemoteOnly: Only users who access the site on the local computer (by using localhost) receive the exception information. All other users are redirected to thedefaultRedirect˹éÒ This mode is used mainly for debugging.

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