Question

System.Reflection.Type 包含GetInterfaceMap，它有助于确定从接口实现某种方法的方法。

Mono.Cecil 是否包含这样的内容？或者如何实现这种行为？

Answer 1

不，Cecil没有提供这样的方法，因为Cecil给我们提供了原样的CIL元数据。（有Cecil.Rocks项目，它包含一些有用的扩展方法，但不包含这个方法）

在MSIL方法中有一个属性'覆盖'，它包含对该方法覆盖的方法的引用（在Cecil中，MethodDefinition类中确实有一个属性覆盖）。但是，此属性仅在某些特殊情况下使用，例如显式接口实现。通常，此属性保留为空，并且所讨论的方法覆盖哪些方法基于约定。这些约定在ECMA CIL标准中描述。简而言之，方法会覆盖具有相同名称和相同签名的方法。

以下代码可能对您和本次讨论有所帮助：http://groups.google.com/group/mono-cecil/browse_thread/thread/b3c04f25c2b5bb4f/c9577543ae8bc40a

    public static bool Overrides(this MethodDefinition method, MethodReference overridden)
    {
        Contract.Requires(method != null);
        Contract.Requires(overridden != null);

        bool explicitIfaceImplementation = method.Overrides.Any(overrides => overrides.IsEqual(overridden));
        if (explicitIfaceImplementation)
        {
            return true;
        }

        if (IsImplicitInterfaceImplementation(method, overridden))
        {
            return true;
        }

        // new slot method cannot override any base classes' method by convention:
        if (method.IsNewSlot)
        {
            return false;
        }

        // check base-type overrides using Cecil's helper method GetOriginalBaseMethod()
        return method.GetOriginalBaseMethod().IsEqual(overridden);
    }

    /// <summary>
    /// Implicit interface implementations are based only on method's name and signature equivalence.
    /// </summary>
    private static bool IsImplicitInterfaceImplementation(MethodDefinition method, MethodReference overridden)
    {
        // check that the 'overridden' method is iface method and the iface is implemented by method.DeclaringType
        if (overridden.DeclaringType.SafeResolve().IsInterface == false ||
            method.DeclaringType.Interfaces.None(i => i.IsEqual(overridden.DeclaringType)))
        {
            return false;
        }

        // check whether the type contains some other explicit implementation of the method
        if (method.DeclaringType.Methods.SelectMany(m => m.Overrides).Any(m => m.IsEqual(overridden)))
        {
            // explicit implementation -> no implicit implementation possible
            return false;
        }

        // now it is enough to just match the signatures and names:
        return method.Name == overridden.Name && method.SignatureMatches(overridden);
    }

    static bool IsEqual(this MethodReference method1, MethodReference method2)
    {
        return method1.Name == method2.Name &&  method1.DeclaringType.IsEqual(method2.DeclaringType);
    }
    // IsEqual for TypeReference is similar...

Mono.Cecil类似于Type.GetInterfaceMap？

1 个答案: