Question

Please help me on how to list all classes with a specific Attribute within an assembly in C#?

Answer 1

I have finally written my own ClassLoader class which supports .NET 2.0, 3.5 and 4.0.

static class ClassLoader
{
    public static IEnumerable<MethodInfo> GetMethodsWithAttribute(Type attributeType, Type type)
    {
        List<MethodInfo> list = new List<MethodInfo>();

        foreach (MethodInfo m in type.GetMethods())
        {
            if (m.IsDefined(attributeType, false))
            {
                list.Add(m);
            }
        }

        return list;
    }

    public static IEnumerable<Type> GetTypesWithAttribute(Type attributeType, string assemblyName)
    {
        Assembly assembly = Assembly.LoadFrom(assemblyName);
        return GetTypesWithAttribute(attributeType, assembly);
    }

    public static IEnumerable<Type> GetTypesWithAttribute(Type attributeType, Assembly assembly)
    {
        List<Type> list = new List<Type>();
        foreach (Type type in assembly.GetTypes())
        {
            if (type.IsDefined(attributeType, false))
                list.Add(type);
        }

        return list;
    }
}