【技术】.Net 下未捕获异常的处理(页 1) - 网站建设 - 【3.A.S.T】网络安全爱好者 -- 网络安全，势在必行

星☆雨 发表于 2009-9-11 23:19

【技术】.Net 下未捕获异常的处理

随着.Net技术的发展，.Net技术被逐渐应用到很多大型的应用软件项目中。这些项目的规模越来越大，很多项目中除了自己的代码外还引用了很多第三方的.net组件。同时很多项目又被应用到很多关键的部门，软件系统的稳定性越来越至关重要。由于.Net 框架提供了非常强大的异常处理机制，同时对一些非托管代码很难控制的系统问题比如指针越界，内存泄漏等提供了很好的解决方案。相比非托管代码构建的系统，.Net构建的系统更加稳定。不过这并不是说.Net构建的系统就完全无懈可击，很多由于代码的不严谨或者系统问题引发的故障将会导致.Net应用程序产生未捕获异常，从而导致应用程序异常终止。本文将对三种最常见的.Net应用的未捕获异常处理进行阐述。    在开始本文之前，让我们来看看.Net在什么情况下会产生未捕获异常。未捕获异常从定义上说就是结构化异常处理未能捕获的异常。通俗的讲就是发生在Try Catch块意外的异常。那么是不是我们在Main函数中加一个Try Catch 块就可以捕获全部未捕获异常了呢？答案是否定的。这里面有两种情况无法通过这种方法捕获：

1. GC 产生的异常，这种异常通常因为Finalize函数中引发未捕获异常引起。当然这并不绝对，一些系统问题比如内存耗尽有时候也会造成GC异常。

2. 主线程以为的线程引发的未捕获异常。这些异常我们往往可以在线程的主函数中用Try Catch 来捕获，但如果系统中使用了外部的组件，或者甚至是.Net 框架自带的一些系统组件，由这些组件的线程引发的异常，调用代码无法通过Try Catch来捕获。

从上面两点来看，即使我们的代码在每个地方都加了Try Catch ，也不能百分百杜绝未捕获异常的发生。

鉴于此，为了提高系统的健壮性和可维护性，我们需要通过一种方法来截获这些未捕获异常，并进行适当的处理。

.Net 的设计者已经考虑到这些问题，并且为我们提供了一个叫 UnhandledExceptionEventHandler 的事件，通过这个事件，我们可以截获未捕获异常，并进行处理。
这个事件的事件参数UnhandledExceptionEventArgs e，有两个属性，一个是ExceptionObject，这个属性返回为截获异常的对象实例。还有一个属性是IsTerminating，这个属性告诉我们这个异常是否会导致应用终止。这里需要说明的是，对于.Net1.1 和 .Net2.0及以上，情况是不一样的，.Net1.1 只有在主线程中的未捕获异常才会终止应用程序，而.Net2.0及以上版本则是始终终止应用程序。如果不终止应用程序，而是有CLR 将当前异常消化，系统的运行状态很可能不可控，最后可能会发生更大的故障，所以.Net2.0以后，对于所有未捕获异常，一律终止当前应用。这样看来，对于.net2.0以上的应用似乎我们截获未捕获异常已经毫无意义，其实不然。通过截获为未捕获异常，我们可以记录下程序是再哪里产生这种未捕获异常的，以便程序的开发者改进程序。我们也可以在当前应用退出前为系统做一些其他的保护工作，比如备份数据，告警提示等等。
下面我们来看看三种常见的.Net应用分别如何来截获未捕获异常。

控制台应用
　　
   首先为当前AppDomain 添加  UnhandledExceptionEventHandler
[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]AppDomain.CurrentDomain.UnhandledException +=

         new UnhandledExceptionEventHandler(UnhandledExceptionEventHandler);

   再添加事件响应函数

[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
static
void UnhandledExceptionEventHandler(object sender, UnhandledExceptionEventArgs e)
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif[/img]       [img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif[/img][img]http://www.cnblogs.com/Images/dot.gif[/img]{
         [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]try
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img]          [img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img][img]http://www.cnblogs.com/Images/dot.gif[/img]{
            [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]using (System.IO.FileStream fs =
new System.IO.FileStream(@"c:\testme.log",
                     System.IO.FileMode.Append, System.IO.FileAccess.Write))

[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img]             [img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img][img]http://www.cnblogs.com/Images/dot.gif[/img]{
                  [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]using (System.IO.StreamWriter w =
new System.IO.StreamWriter(fs,
                           System.Text.Encoding.UTF8))

[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img]                   [img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img][img]http://www.cnblogs.com/Images/dot.gif[/img]{
                     w.WriteLine(e.ExceptionObject);[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]
                  }[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]
            }[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]
         }[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]
         [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]catch
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img]          [img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img][img]http://www.cnblogs.com/Images/dot.gif[/img]{
         }[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]
      }[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif[/img]

现在我们就可以截获未捕获异常了
下面是完整的测试代码：

[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
public
class TestRaiseException
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif[/img]       [img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif[/img][img]http://www.cnblogs.com/Images/dot.gif[/img]{
         [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]~TestRaiseException()
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img]          [img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img][img]http://www.cnblogs.com/Images/dot.gif[/img]{
            [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]int i =
0;
            [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]int j =
1
/ i;
         }[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]
      }[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif[/img]
[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
      [img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]static
void UnhandledExceptionEventHandler(object sender, UnhandledExceptionEventArgs e)
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif[/img]       [img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif[/img][img]http://www.cnblogs.com/Images/dot.gif[/img]{
         [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]try
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img]          [img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img][img]http://www.cnblogs.com/Images/dot.gif[/img]{
            [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]using (System.IO.FileStream fs =
new System.IO.FileStream(@"c:\testme.log",
                  System.IO.FileMode.Append, System.IO.FileAccess.Write))

[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img]             [img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img]{[img]http://www.cnblogs.com/Images/dot.gif[/img]

                  [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]using (System.IO.StreamWriter w =
new System.IO.StreamWriter(fs,
                     System.Text.Encoding.UTF8))

[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img]                   [img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img]{[img]http://www.cnblogs.com/Images/dot.gif[/img]

                     w.WriteLine(e.ExceptionObject);[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]
                  }[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]
            }[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]
         }[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]
         [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]catch
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img]          [img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img][img]http://www.cnblogs.com/Images/dot.gif[/img]{
         }[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]
      }[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif[/img]
[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
      [img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]static
void Main(string[] args)
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif[/img]       [img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif[/img][img]http://www.cnblogs.com/Images/dot.gif[/img]{
         AppDomain.CurrentDomain.UnhandledException [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]+=

                  new UnhandledExceptionEventHandler(UnhandledExceptionEventHandler);

[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]

         TestRaiseException testRaiseException [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]=
new TestRaiseException();
[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]
      }[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif[/img]

程序运行后记录下日志如下
System.DivideByZeroException: Attempted to divide by zero.
at TestCosole.Program.TestRaiseException.Finalize()

WinForm
WinForm 应用通过 Application.ThreadException 事件来截获未捕获异常
　　详见园子里面另一篇博客，这里就不再冗诉。
   [url=http://www.cnblogs.com/cgzwwy/archive/2008/08/31/1280597.html]链接标记体面地处理程序的未捕获异常[/url]

Asp.net
   ASP.NET 应用和前两种应用有所不同，ASP.NET 一般在后台线程或者线程池中产生未捕获异常，才会导致W3WP.exe终止，并在事件查看器中产生一条类似下面内容的事件：EventType clr20r3, P1 w3wp.exe, P2 6.0.3790.1830, P3 42435be1, P4 app_web_ncsnb2-n, P5 0.0.0.0, P6 440a4082, P7 5, P8 1, P9 system.nullreferenceexception, P10 NIL.
   要截获ASP.NET 的未捕获异常，我们需要为每个应用程序域安装事件钩子
   这个过程需要分两步完成：

   首先创建一个实现IHttpModule接口的类

[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]using System;
[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]using System.Data;
[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]using System.Configuration;
[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]using System.Web;
[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]using System.Web.Security;
[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]using System.Web.UI;
[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]using System.Web.UI.WebControls;
[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]using System.Web.UI.WebControls.WebParts;
[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]using System.Web.UI.HtmlControls;
[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]namespace WebMonitor
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif[/img][img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif[/img][img]http://www.cnblogs.com/Images/dot.gif[/img]{
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img] [img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img]/**////
<summary>
[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]/// Summary description for UnhandledExceptionModule
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]///
</summary>
[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]
public
class UnhandledExceptionModule : IHttpModule
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img] [img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img][img]http://www.cnblogs.com/Images/dot.gif[/img]{
      [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]static
object _initLock =
new
object();
      [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]static
bool _initialized =
false;
[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]
      [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]public UnhandledExceptionModule()
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img]       [img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img][img]http://www.cnblogs.com/Images/dot.gif[/img]{
         [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]//
         [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]// TODO: Add constructor logic here
         [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]//
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]       }
[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]
[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]
      [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]void OnUnhandledException(object o, UnhandledExceptionEventArgs e)
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img]       [img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img][img]http://www.cnblogs.com/Images/dot.gif[/img]{
         [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]//Do some thing you wish to do when the Unhandled Exception raised.
[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]
         [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]try
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img]          [img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img][img]http://www.cnblogs.com/Images/dot.gif[/img]{
            [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]using (System.IO.FileStream fs =
new System.IO.FileStream(@"c:\testme.log",
                     System.IO.FileMode.Append, System.IO.FileAccess.Write))

[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img]             [img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img]{[img]http://www.cnblogs.com/Images/dot.gif[/img]

                  [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]using (System.IO.StreamWriter w =
new System.IO.StreamWriter(fs, System.
                        Text.Encoding.UTF8))

[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img]                   [img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img]{[img]http://www.cnblogs.com/Images/dot.gif[/img]

                     w.WriteLine(e.ExceptionObject);[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]
                  }[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]
            }[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]
         }[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]
         [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]catch
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img]          [img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img][img]http://www.cnblogs.com/Images/dot.gif[/img]{
         }[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]
      }[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]
[img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img]       [img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img]IHttpModule Members#region IHttpModule Members
[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]
      [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]public
void Dispose()
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img]       [img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img][img]http://www.cnblogs.com/Images/dot.gif[/img]{
         [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]throw
new Exception("The method or operation is not implemented.");
      }[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]
[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]
      [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]public
void Init(HttpApplication context)
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img]       [img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img][img]http://www.cnblogs.com/Images/dot.gif[/img]{
         [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]// Do this one time for each AppDomain.
[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]
lock (_initLock)
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img]          [img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img][img]http://www.cnblogs.com/Images/dot.gif[/img]{
            [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]if (!_initialized)
[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif[/img]             [img]http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif[/img][img]http://www.cnblogs.com/Images/dot.gif[/img]{
                  AppDomain.CurrentDomain.UnhandledException [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]+=
new UnhandledExceptionEventHandler(OnUnhandledException);
                  _initialized [img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]=
true;
            }[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]
         }[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]
      }[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]
[img]http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif[/img]
      [img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]#endregion
}[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif[/img]
}[img]http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif[/img]
[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]

第二步：

修改web.config
在 system.web 段中加入
[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
<httpModules>
   [img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]<add name="UnhandledExceptionModule" type="WebMonitor.UnhandledExceptionModule"
/>
   [img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]</httpModules>

完成这两步后，你的ASP.NET 应用就可以截获未捕获异常了。

下面是测试代码

[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]using System;
using System.Data;[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
using System.Configuration;[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
using System.Web;[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
using System.Web.Security;[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
using System.Web.UI;[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
using System.Web.UI.WebControls;[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
using System.Web.UI.WebControls.WebParts;[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
using System.Web.UI.HtmlControls;[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
public partial class _Default : System.Web.UI.Page [img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
{[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
protected void Page_Load(object sender, EventArgs e)[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
{[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
}[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
protected void TestMe(object state)[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
{[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
      byte[] buf = new byte[2];[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
      buf[2] = 0;[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
}[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
protected void Button1_Click(object sender, EventArgs e)[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
{[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
      System.Threading.ThreadPool.QueueUserWorkItem(new System.Threading.WaitCallback(TestMe), [img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
               null);

}[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]

}[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]
[img]http://www.cnblogs.com/Images/OutliningIndicators/None.gif[/img]

按下Button1后，w3wp.exe被终止，testme.log 中记录下了异常信息如下：
System.IndexOutOfRangeException: Index was outside the bounds of the array.

at _Default.TestMe(Object state) in c:"ApolloWorkFolder"test"laboratory
"TestWebSite"Default.aspx.cs:line 21
at System.Threading._ThreadPoolWaitCallback.WaitCallback_Context(Object state)
at System.Threading.ExecutionContext.runTryCode(Object userData)

at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(
TryCode code, CleanupCode backoutCode, Object userData)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext,
ContextCallback callback, Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext,
ContextCallback callback, Object state)
at System.Threading._ThreadPoolWaitCallback.PerformWaitCallbackInternal(
_ThreadPoolWaitCallback tpWaitCallBack)

at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback(Object state)

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