Moq:验证使用特定委托调用方法会产生“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，它调用接口 B 上的方法，将它自己的方法之一传递给它，作为 B 的延续 应该在有结果时调用.该代码在实践中似乎运行良好，但我不知道如何使用 Moq 对其进行测试——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.起初以为这可能是我的代码，但它与以下玩具箱的失败方式相同:

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));
    }
}

我猜有一些我还不理解的代理的幕后魔术，我对 C# 相对较新，但是测试这个的正确方法是什么?

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 错误；我已将其归档为 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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