为什么使用 Moq 创建的模拟实例会抛出 System.BadImageFormatException？

发布于 2024-07-20 19:03:17 字数 1070 浏览 7 评论 0原文

这个问题可能与另一个问题相关，并且它肯定会导致 System.BadImageFormatException。也许是同一件事，但曝光不同？

我有以下代码：

public interface IFoo<T> where T : class, new() {
  T FooMethod(object o);
}

public interface IFooRepo {
  F GetFoo<T, F>() where T : class, new() where F : IFoo<T>;
}

然后我有一个使用 Moq 模拟 IFooRepo 的测试，如下所示：

var instance = new Mock<IFooRepo>().Object;

上面的代码运行良好，除非使用 Visual Studio 2008 调试测试。当我跨过上面的行时，系统会抛出 System.BadImageFormatException通过 Castle.DynamicProxy .Reflection.Emit。这是否与 Ayende Rahien 发布的某些内容类似？

现在的解决方法是为 IFooRepo 实现一个假的，但我很好奇为什么会为这种情况生成不良图像，有解决办法吗？ System.Reflection.Emit 有问题吗？或者我在自己的代码中遗漏了一些明显的东西？

编辑：发布了 GetFoo() 的错误签名。将签名更正为 GetFoo()，这可以正确重现问题。安装 GDR 后，此问题仍然存在。

编辑：似乎如果对 F 的约束包含类型参数 T BadImageFormatException 就会引发。但我将其更改为 where F : class, new()，然后一切都会按预期工作。

原文

This question may be related to another question and it certainly results with a System.BadImageFormatException. Maybe it's the same thing but exposed differently?

I have the following the code:

public interface IFoo<T> where T : class, new() {
  T FooMethod(object o);
}

public interface IFooRepo {
  F GetFoo<T, F>() where T : class, new() where F : IFoo<T>;
}

Then I have a test that mocks IFooRepo using Moq like so:

var instance = new Mock<IFooRepo>().Object;

The above code runs fine except when debugging the test with Visual Studio 2008. When I step over the above line a System.BadImageFormatException is thrown from System.Reflection.Emit via Castle.DynamicProxy. Could this be similar to something Ayende Rahien posted?

Now the workaround is to implement a fake for IFooRepo but I'm curious as to why a bad image is generated for this kind of scenario and is there a fix? Is System.Reflection.Emit buggy? Or am I missing something obvious in my own code?

EDIT: Posted the incorrect signature for GetFoo(). Corrected the signature to GetFoo<T, F>(), which correctly reproduces the problem. With the GDR installed this problem persists.

EDIT: It seems that if the constraint on F includes type parameter T BadImageFormatException is raised. But I change it to, say where F : class, new(), then everything works as expected.

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