C#5 AsyncCtp BadImageFormatException

Question

请帮助我解决这个问题，我一直在使用AsyncCtpLibrary和C#5 ctp编译器编写控制台应用程序。当我第一次真正运行等待的代码时，我得到了以下信息：

System.BadImageFormatException was unhandled
  Message=An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0x8007000B)
  Source=AsyncCtpLibrary
  StackTrace:
    Server stack trace: 
       at [...].<Execute>d__1c.MoveNext()
       at [...].Execute()
       at [...].<Move>d__1d.MoveNext() in[..]:line 266
    Exception rethrown at [0]: 
       at System.Runtime.CompilerServices.AsyncVoidMethodBuilder.<SetException>b__1(Object state)
       at System.Threading.QueueUserWorkItemCallback.WaitCallback_Context(Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
       at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
       at System.Threading.ThreadPoolWorkQueue.Dispatch()
       at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()
  InnerException: 

是否缺少要引用的dll？

重要的新产品

我失败的方法如下所示：

public async override Task<bool> Execute()
{
    //do stuff
    await stuff;
    //do other stuff
    await base.Execute()
    //do other stuff
    return true;
}

我遵循乔恩·斯基特的建议，试图一点一点地重现这个错误，现在我可以看出，等待base.Execute()线才是杀手！如果我注释了这一行，那么所有东西都会运行，如果我把它放在里面，调用我的方法就会立即失败(而不是在到达base.Execute()时)。所以我假设ctp编译器会做一些奇怪的事情。为什么？我不应该做什么？虫子有多大？

老东西：

编辑：

至于32位/64位问题，我的系统是32位(在虚拟机中，请注意)，据我所知，AsyncCtpLibrary.dll不包含非托管代码。我的所有项目(类库和单个控制台应用程序)都有如下构建选项卡：

，还有什么可能还是错的？

编辑:我还检查了融合日志查看器，加载AsyncCtpLibrary时没有任何错误：

*** Assembly Binder Log Entry  (6/10/2011 @ 9:04:11 PM) ***    
The operation was successful.    
Bind result: hr = 0x0. The operation completed successfully.     
Assembly manager loaded from:  C:\Windows\Microsoft.NET\Framework\v4.0.30319\clr.dll    
Running under executable  C:\Users\Daver\Documents\Visual Studio 2010\Projects\[...]\bin\Debug\MyApp.exe

--- A detailed error log follows. 

=== Pre-bind state information ===    
LOG: User = WIN-N74LV38NLV3\Daver    
LOG: DisplayName = AsyncCtpLibrary, Version=1.0.4107.18181, Culture=neutral, PublicKeyToken=31bf3856ad364e35    
 (Fully-specified)    
LOG: Appbase = file:///C:/Users/Daver/Documents/Visual Studio 2010/Projects/[...]/bin/Debug/

LOG: Initial PrivatePath = NULL    
LOG: Dynamic Base = NULL    
LOG: Cache Base = NULL    
LOG: AppName = MyApp.exe    
Calling assembly : MyLibrary, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null.
===

LOG: This bind starts in default load context.    
LOG: Using application configuration file: C:\Users\Daver\Documents\Visual Studio 2010\Projects\[...]\bin\Debug\MyApp.exe.Config    
LOG: Using host configuration file:     
LOG: Using machine configuration file from C:\Windows\Microsoft.NET\Framework\v4.0.30319\config\machine.config.    
LOG: Post-policy reference: AsyncCtpLibrary, Version=1.0.4107.18181, Culture=neutral, PublicKeyToken=31bf3856ad364e35    
LOG: GAC Lookup was unsuccessful.    
LOG: Attempting download of new URL file:///C:/Users/Daver/Documents/Visual Studio 2010/Projects/[...]/bin/Debug/AsyncCtpLibrary.DLL.    
LOG: Assembly download was successful. Attempting setup of file: C:\Users\Daver\Documents\Visual Studio 2010\Projects\[...]\bin\Debug\AsyncCtpLibrary.dll    
LOG: Entering run-from-source setup phase.    
LOG: Assembly Name is: AsyncCtpLibrary, Version=1.0.4107.18181, Culture=neutral, PublicKeyToken=31bf3856ad364e35    
LOG: Binding succeeds. Returns assembly from C:\Users\Daver\Documents\Visual Studio 2010\Projects\[...]\bin\Debug\AsyncCtpLibrary.dll.    
LOG: Assembly is loaded in default load context.

我还检查了编译器生成的类的MoveNext()方法的<Execute>d__1c IL代码，它引用的唯一程序集(assemblyName)是mscorlib、System.Core和AsyncCtpLibrary。

我检查了我的dll和的dll和AsyncCtpLibrary，我的.corflags 0x00000003 // ILONLY 32BITREQUIRED说，AsyncCtpLibrary说.corflags 0x00000009 // ILONLY，我不确定这是否是问题所在。

，请帮帮忙，我没有主意了！

Answer 1

编辑:我已经收到编译器团队的回复，他们已经确认它是一个bug。它已经在他们的代码库中被修复了，所以希望我们在下一个版本/ beta / CTP中看到这个修复。修复不会被重新移植到“正常”VS2010，因为它是一组非常不寻常的环境，至少在异步之前是这样的。

编辑:好的，我现在有一个很短但很完整的程序来演示这个问题。我认为这是泛型和基本方法的混合：

using System;
using System.Threading.Tasks;

public abstract class AsyncAction<T>
{
    public virtual Task<T> Execute()
    {
        // We never get this far
        Console.WriteLine("Execute called");
        return null;
    }
}

public class BoolAction : AsyncAction<bool>
{
    public async override Task<bool> Execute()
    {
        return await base.Execute();
    }
}

class Test
{
    static void Main()
    {
        BoolAction b = new BoolAction();
        b.Execute();
    }
}

编辑:好的，我想出了一个解决办法。基本上，要非虚拟地调用基类方法，编译器将在BoolAction中创建一个合成方法.这有点不对，但我们可以做得对：

public class BoolAction : AsyncAction<bool>
{
    public async override Task<bool> Execute()
    {
        return await BaseExecute();
    }

    private Task<bool> BaseExecute()
    {
        return base.Execute();
    }
}

因此，无论何时编写base.Execute，编写BaseExecute并插入额外的方法。这不是很糟糕的解决办法，直到团队修复错误。

编辑:我已经稍微简化了这个例子--您不需要任何重写，特别是不需要基类来公开Task<T>。对任何虚拟base.Foo方法的调用都会做到这一点：

public abstract class AsyncAction<T>
{
    public virtual T GetT()
    {
        return default(T);
    }
}

public class BoolAction : AsyncAction<bool>
{
#pragma warning disable 1998 // We're not awaiting anything
    public async void Execute()
    {
        base.GetT();
    }
#pragma warning restore 1998
}

class Test
{
    static void Main()
    {
        BoolAction b = new BoolAction();
        b.Execute();
    }
}

编辑:与我之前的想法相反，这也会影响迭代器。不需要异步CTP。

public abstract class Base<T>
{
    public virtual T GetT()
    {
        return default(T);
    }
}

public class Derived : Base<bool>
{
    public System.Collections.IEnumerator Foo()
    {
        base.GetT();
        yield break;
    }
}

class Test
{
    static void Main()
    {
        Derived d = new Derived();
        d.Foo().MoveNext();
    }
}

编辑:它也会影响匿名功能.

using System;

public abstract class Base<T>
{
    public virtual T GetT()
    {
        return default(T);
    }
}

public class Derived : Base<bool>
{
    public void Foo()
    {
        Action x = () => base.GetT();
        x();
    }
}

class Test
{
    static void Main()
    {
        Derived d = new Derived();
        d.Foo();
    }
}

Answer 2

您正在命中已知的VS 2010错误。

https://connect.microsoft.com/VisualStudio/feedback/details/626550/badimageformatexception-on-simple-program-using-generics-and-lambdas

Answer 3

当您尝试在64位环境中加载32位DLL时，通常会发生此异常。

如果在64位操作系统上运行，请尝试更改项目设置以直接编译x86 (而不是AnyCPU)。

(这听起来可能有点倒转，但这是因为如果要加载外部32位DLL，则需要强制整个项目为32位。)