Moq：使用特定委托调用验证方法会产生“方法参数长度不匹配” [英] Moq: Verifying a method was called with a particular delegate produces "method argument length mismatch"

问题描述

我有一个类 A ，调用界面 B 上的一个方法，传递给它一个自己的方法作为一种连续性，当 c> B 在结果时应该调用。代码似乎在实践中工作正常，但是我无法弄清楚如何使用Moq进行测试 - 当我尝试显而易见的事情时，它会产生 System.ArgumentException：方法参数长度不匹配。首先它可能是我的代码，但是它与以下玩具案例的失败方式相同：

I've got a class A that calls a method on interface B, passing to it one of its own methods as sort of a continuation that B is supposed to call when it has a result. The code seems to work fine in practice, but I can't figure out how to test it with Moq -- when I try the obvious thing, it produces System.ArgumentException : method argument length mismatch. Thought at first it might be my code, but it fails the same way with the following toy case:

public class A
{
    readonly B myB;

    public A (B b)
    {
        myB = b;
    }

    public void HandleC (C c)
    {
        // do something
    }

    public void DoFindC ()
    {
        myB.FindC (HandleC);
    }
}

public interface B
{
    // Finds a C and then passes it to handleC
    void FindC (Action<C> handleC);
}

public interface C
{
}

[TestFixture()]
public class ATest
{
    [Test()]
    public void TestDoFindC ()
    {
        Mock<B> bMock = new Mock<B> ();
        A a = new A(bMock.Object);
        a.DoFindC();

        bMock.Verify(b => b.FindC(a.HandleC));
    }
}

我猜这里有一些幕后对于C＃来说，我不了解的代表的魔法，对于C＃来说是比较新的，但是测试的方法是什么？

I'm guessing there's some behind-the-scenes magic with delegates that I don't understand yet, being relatively new to C#, but what's the right way to test this?

更新：作为参考，我在MacOS 10.6.5上使用Mono 2.6.7，并针对.NET 3.5。

Update: For reference, I'm using Mono 2.6.7 on MacOS 10.6.5 and targeting .NET 3.5.

再次更新：最好的猜测是这是一个Mono bug;我已将其提交为 https://bugzilla.novell.com/show_bug.cgi?id = 656918 。

Updated again: Best guess is that this is a Mono bug; I've filed it as https://bugzilla.novell.com/show_bug.cgi?id=656918.

推荐答案

单声道错误： https://bugzilla.novell.com/show_bug.cgi?id=656918 。

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