Question

I need to be able to determine if a given method or property comes from a particular interface and is explicitly implemented.
Has anyone done this and is it actually possible to get this information by the means of .NET reflection?

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Update

As can be seen in comments below the accepted answer, the actual thing I am trying to accomplish is to call the method that implements a particular interface via reflection. Since the possibility to have multiple interfaces with the same method signature, I wanted to determine the right implementation to invoke based on the interface. In my scenario, the implementation type, interface and method name are determined at runtime, so I cannot use simple casting
in my case.

Answer 1

Explicitly implemented interface methods in C# are private in the target class. You can use this fact and create this extension method to return only these methods:

static IEnumerable<MethodInfo> GetExplicitlyImplementedMethods(this Type targetType, 
    Type interfaceType) 
{ 
  return targetType.GetInterfaceMap(interfaceType).TargetMethods.Where(m => m.IsPrivate);
}

Note: this is for C# only.

UPDATE: But, from your requirements, it seems that you only want to know which methods implement which interface methods, without really caring about whether the implementation is implicit or explicit. For a solution that works across languages then, this would suffice:

static IEnumerable<MethodInfo> GetImplementedMethods(this Type targetType,
    Type interfaceType) 
{ 
  return targetType.GetInterfaceMap(interfaceType).TargetMethods;
}