编译器为匿名方法生成了不正确的代码 [MS BUG FIXED] [英] Compiler generated incorrect code for anonymous methods [MS BUG FIXED]

问题描述

见以下代码:

public abstract class Base
{
    public virtual void Foo<T>() where T : class
    {
        Console.WriteLine("base");
    }
}

public class Derived : Base
{
    public override void Foo<T>()
    {
        Console.WriteLine("derived");
    }

    public void Bang()
    {
        Action bang = new Action(delegate { base.Foo<string>(); });
        bang();    //VerificationException is thrown
    }
}

new Derived().Bang(); 抛出异常.在 Bang 方法生成的 CIL 中，我得到了:

new Derived().Bang(); throws an exception. Inside the generated CIL of the method Bang I got:

call instance void ConsoleApp.Derived::'<>n__FabricatedMethod1'<string>()

以及编译器生成方法的签名:

and the signature of the compiler generated method:

method private hidebysig 
    instance void '<>n__FabricatedMethod1'<T> () cil managed 
{
    .custom instance void [mscorlib]System.Runtime.CompilerServices.CompilerGeneratedAttribute::.ctor() = (
        01 00 00 00
    )       
    .maxstack 8

    IL_0000: ldarg.0
    IL_0001: call instance void ConsoleApp.Base::Foo<!!T>()
    IL_0006: ret
}

我认为正确的代码应该是'<>n__FabricatedMethod1'<class T>.它是一个错误吗?顺便说一句，不使用 delegate{ }(lambda 表达式是一样的)，代码可以很好地使用语法糖.

I think the correct code should be '<>n__FabricatedMethod1'<class T>. Is it a bug? By the way, without using delegate{ }(lambda expression is the same), the code works fine with syntax sugars.

Action good = new Action(base.Foo<string>());
good();  //fine

编辑我在 windows8 RTM，.net framework 4.5 中使用 VS2012 RTMRel

EDIT I'm using VS2012 RTMRel in windows8 RTM, .net framework 4.5

编辑此错误现已修复.

推荐答案

确认为bug，现已修复

更新:Connect 文章不再存在.错误已修复.

Update: the Connect article no longer exists. The bug is fixed.

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