C# reflection, get overloaded method

I've already checked a few other posts regarding reflection and overloaded methods but could find any help. One post I found was this one, but that didn't help a lot.

I have the following to methods:

1 | public void Delete<T>(T obj) where T : class { ... }
2 | public void Delete<T>(ICollection<T> obj) where T : class { ... }

I'm trying to get method N°1.

I tried the classic GetMethod("Delete") approach, but since there are two methods with this name a Ambiguous-Exception was thrown. I tried specifying the method schema with an additional parameter like GetMethod("Delete", new [] { typeof(Object) }) which didn't find anything (null returned).

I figgured I might as well just loop through all methods and check for the parameters. I have the following method...

public static IEnumerable<MethodInfo> GetMethods(this Type t, String name, Type schemaExclude)
{
    IEnumerable<MethodInfo> rm = t.GetRuntimeMethods().Where(x => x.Name.Equals(name));
    return (from runtimeMethod in rm let pis = runtimeMethod.GetParameters() where !pis.Any(x => schemaExclude.IsAssignableFrom(x.ParameterType)) select runtimeMethod).ToList();
}

... which returns the methods which do not contain a parameter with type schemaExclude.

I called it like this GetMethods("Delete", typeof(ICollection)) which didn't work as expected.

Apparently ..ICollection'1[T] is not assignable to ICollection. Neither is it to IEnumerable, IEnumerable<> and ICollection<>. I, again, tried it with typeof(Object) which did work but did return both methods (like its supposed to).

What exactly am I missing?