Question

要么我在DoWork中抛出异常或自然地引发异常，它就不会被捕获，并且控制权不会传递给工人完成例程，而是获取我在Program.cs文件中捕获的异常

Type: System.Reflection.TargetInvocationException
Source: mscorlib
Message: Exception has been thrown by the target of an invocation.
Target Site: System.Object _InvokeMethodFast(System.IRuntimeMethodInfo, System.Object, System.Object[], System.SignatureStruct ByRef, System.Reflection.MethodAttributes, System.RuntimeType)
Module Name: mscorlib.dll
Module Path: C:\Windows\Microsoft.NET\Framework\v4.0.30319\mscorlib.dll
Stack:
  at System.RuntimeMethodHandle._InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeType typeOwner)
  at System.RuntimeMethodHandle.InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeType typeOwner)
  at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
  at System.Delegate.DynamicInvokeImpl(Object[] args)
  at System.Windows.Forms.Control.InvokeMarshaledCallbackDo(ThreadMethodEntry tme)
  at System.Windows.Forms.Control.InvokeMarshaledCallbackHelper(Object obj)
  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, Boolean ignoreSyncCtx)
  at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
  at System.Windows.Forms.Control.InvokeMarshaledCallback(ThreadMethodEntry tme)
  at System.Windows.Forms.Control.InvokeMarshaledCallbacks()
  at System.Windows.Forms.Control.WndProc(Message& m)
  at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
  at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
  at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
  at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
  at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
  at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
  at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
  at System.Windows.Forms.Application.Run(Form mainForm)

程序中的代码段

// ...
BackgroundWorker worker = new BackgroundWorker();                
worker.WorkerSupportsCancellation = true;
worker.WorkerReportsProgress = true;
worker.DoWork += new DoWorkEventHandler(worker_DoWork);
worker.ProgressChanged += new ProgressChangedEventHandler(worker_ProgressChanged);
worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);                
worker.RunWorkerAsync(); 
// ...

void worker_DoWork(object sender, DoWorkEventArgs e)
{
    // ... 
    throw new Exception("I want to be caught and passed to completed event handler")   
    // ...
}

Answer 1

您也可以尝试在worker_DoWork中捕捉您的例外情况。这样一定不会传播到其他地方。

为什么在BackgroundWorker DoWork例程中没有捕获异常？

1 个答案: