Type.GetMembers() on an interface does not return members from inherited interfaces

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Type.GetMembers() on an interface does not return members from inherited interfaces

Consider the following:



using System;
using System.Reflection;

public interface IBaseBlah
{
    string GetSuperString();
}

public interface IBlah : IBaseBlah
{
    object DoStuff(string name);
}

public class Foo
{
    public static void Main()
    {
        Type t = typeof(IBlah);
        foreach(MemberInfo info in t.GetMembers(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance))
            Console.WriteLine(info.Name);        
    }
}

 



The output here only gives me "DoStuff". The method on the base interface, GetSuperString(), is not returned. Why not How can I retrieve all methods on an interface, including those provided by base interfaces



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Type.GetMembers() on an interface does not return members from inherited interfaces

  • Shane Gidley

    Could you provide a more complete sample, this code works for me.
    It could list the same members more than once if interface is declared as a "base" for more than one interface

  • ebc

    Not sure if it will work, but have you tried throwing in a BindingFlags.FlattenHierarchy into your binding flags

    -Shawn



  • Najm

    Just to add/clarify.
    class A { }
    class B : A {}
    interface I {}
    class D : I {}
    interface I2 : I {}

    B inherits from A
    D promises to implement I (and probably does)
    I2 forces whoever implements I2 to also implement I

    The last point is important because there is no interface inheritance in CLI

  • coronaride

    Thanks to all who have replied. I will have to work around this using .GetInterfaces() as described.

  • aalford

    I did that when trying to figure out a solution myself. It doesn't help, and the help for FlattenHierarchy says it only works for static members.

    I wrote a little helper method for the workaround taumuon suggested:



    public List<MemberInfo> GetMemberList(Type type)
    {
            List<MemberInfo> result = new List<MemberInfo>();
        result.AddRange(type.GetMembers(    BindingFlags.Public | BindingFlags.Instance));
            foreach (Type baseInterface in type.GetInterfaces())
        {
            result.AddRange(GetMemberList(baseInterface));
        }
            return result;
    }
     



  • Jeff Walsh

    Nevermind, my mistake. When I tried it yesterday, it didn't seem to work, but I guess it was too late already...

  • Johan Delimon

    Using ILDASM, you can see that IBlah implements IBaseBlah and doesn't duplicate the members.

    I'm not sure why GetMethods() understands when a class derives from (extends in the MSIL) another class, but doesn't understand when an interface implements another one.

    As a workaround, you could recursively use the Type.FindInterfaces method on IBlah to find all implemented interfaces and their methods.


  • Type.GetMembers() on an interface does not return members from inherited interfaces
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