gistfile1.cs

using System;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace TestProject3
{
    public interface IExecuteType<T>
    {
        bool IsExecuted { get; set; }
    }

    public class ClassA { }
    public class ClassB { }
    public class ClassC { }

    public class MyImplClass : IExecuteType<ClassA>, IExecuteType<ClassB>, IExecuteType<ClassC>
    {

        // outras operações desta classe...

        public void DoOperation()
        {
            ((IExecuteType<ClassB>)this).IsExecuted = true;
        }

        //...

        bool IExecuteType<ClassA>.IsExecuted { get; set; }
        bool IExecuteType<ClassB>.IsExecuted { get; set; }
        bool IExecuteType<ClassC>.IsExecuted { get; set; }

        public bool IsExecutedToType(Type type)
        {
            return (bool)typeof(IExecuteType<>).MakeGenericType(new [] { type }).GetMethod("get_IsExecuted").Invoke(this, new object[] { });
        }
    }

    [TestClass]
    public class UnitTest1
    {
        [TestMethod]
        public void TestMethod1()
        {
            var aClass = new MyImplClass();
            aClass.DoOperation();
            Assert.IsTrue(aClass.IsExecutedToType(typeof(ClassB)));
        }
    }
}