AppDomain.UnhandledException 事件

定义

命名空间:

System

程序集:

System.Runtime.dll

Source:

AppDomain.cs

当某个异常未被捕获时出现。

public:
 event UnhandledExceptionEventHandler ^ UnhandledException;

public event UnhandledExceptionEventHandler? UnhandledException;

member this.UnhandledException : UnhandledExceptionEventHandler 

Public Custom Event UnhandledException As UnhandledExceptionEventHandler 

事件类型

UnhandledExceptionEventHandler

示例

以下示例演示 了 事件 UnhandledException 。 它定义事件处理程序 ， MyHandler每当在默认应用程序域中引发未经处理的异常时，就会调用该事件处理程序。 然后，它会引发两个异常。 第一个由 try/catch 块处理。 第二个未处理，在应用程序终止之前调用 MyHandle 例程。

// The example should be compiled with the /clr:pure compiler option.
using namespace System;
using namespace System::Security::Permissions;

public ref class Example
{


private:
   static void MyHandler(Object^ sender, UnhandledExceptionEventArgs^ args)
   {
      Exception^ e = dynamic_cast<Exception^>(args->ExceptionObject);
      Console::WriteLine( "MyHandler caught : {0}", e->Message );
      Console::WriteLine("Runtime terminating: {0}", args->IsTerminating);
   }
   
public: 
   [SecurityPermissionAttribute( SecurityAction::Demand, ControlAppDomain = true )]
   static void Main()
   {
      AppDomain^ currentDomain = AppDomain::CurrentDomain;
      currentDomain->UnhandledException += gcnew UnhandledExceptionEventHandler(Example::MyHandler);
      try
      {
         throw gcnew Exception("1");
      }
      catch (Exception^ e) 
      {
         Console::WriteLine( "Catch clause caught : {0}\n", e->Message );
      }

      throw gcnew Exception("2");
   }
};

void main()
{
   Example::Main();
}   
// The example displays the following output:
//       Catch clause caught : 1
//       
//       MyHandler caught : 2
//       Runtime terminating: True
//       
//       Unhandled Exception: System.Exception: 2
//          at Example.Main()
//          at mainCRTStartup(String[] arguments)

using System;

public class Example
{
   public static void Main()
   {
      AppDomain currentDomain = AppDomain.CurrentDomain;
      currentDomain.UnhandledException += new UnhandledExceptionEventHandler(MyHandler);

      try {
         throw new Exception("1");
      } catch (Exception e) {
         Console.WriteLine("Catch clause caught : {0} \n", e.Message);
      }

      throw new Exception("2");
   }

   static void MyHandler(object sender, UnhandledExceptionEventArgs args)
   {
      Exception e = (Exception) args.ExceptionObject;
      Console.WriteLine("MyHandler caught : " + e.Message);
      Console.WriteLine("Runtime terminating: {0}", args.IsTerminating);
   }
}
// The example displays the following output:
//       Catch clause caught : 1
//
//       MyHandler caught : 2
//       Runtime terminating: True
//
//       Unhandled Exception: System.Exception: 2
//          at Example.Main()

open System
open System.Security.Permissions

let myHandler _ (args: UnhandledExceptionEventArgs) =
    let e = args.ExceptionObject :?> Exception
    printfn $"MyHandler caught : {e.Message}"
    printfn $"Runtime terminating: {args.IsTerminating}"

[<EntryPoint>]
let main _ =
    let currentDomain = AppDomain.CurrentDomain
    currentDomain.UnhandledException.AddHandler(UnhandledExceptionEventHandler myHandler)

    try
        failwith "1"
    with e ->
        printfn $"Catch clause caught : {e.Message} \n"

    failwith "2"

// The example displays the following output:
//       Catch clause caught : 1
//
//       MyHandler caught : 2
//       Runtime terminating: True
//
//       Unhandled Exception: System.Exception: 2
//          at Example.main()

Module Example
   Sub Main()
      Dim currentDomain As AppDomain = AppDomain.CurrentDomain
      AddHandler currentDomain.UnhandledException, AddressOf MyHandler
      
      Try
         Throw New Exception("1")
      Catch e As Exception
         Console.WriteLine("Catch clause caught : " + e.Message)
         Console.WriteLine()
      End Try
      
      Throw New Exception("2")
   End Sub
   
   Sub MyHandler(sender As Object, args As UnhandledExceptionEventArgs)
      Dim e As Exception = DirectCast(args.ExceptionObject, Exception)
      Console.WriteLine("MyHandler caught : " + e.Message)
      Console.WriteLine("Runtime terminating: {0}", args.IsTerminating)
   End Sub
End Module
' The example displays the following output:
'       Catch clause caught : 1
'       
'       MyHandler caught : 2
'       Runtime terminating: True
'       
'       Unhandled Exception: System.Exception: 2
'          at Example.Main()

注解

有关此 API 的详细信息，请参阅 UnhandledException 的补充 API 说明。