Create list of runtime-known type from object list and call generic method

I have IEnumerable<object> in memory.

Let's say this:

IEnumerable<object>() addedEntities = // ... some Linq-To-Object query

Also, I have a method with this signature:

public static IEnumerable<TSource> FilterByUniqueProp<TSource>
                (this IEnumerable<TSource> query, TSource model)
{
       // Do something accourding to this type
       var type = model.GetType();
}

As you see, this is an extension method. So, I can't dynamically call it, I must use MethodInfo for executing it in runtime.

In runtime, I must dynamically call this method for some Enumerable<T> of runtime-known type. But, it didn't matter what I did, it doesn't work. Either model.GetType() is always Object or exception is thrown.

Object of type 'System.Linq.Enumerable+WhereSelectArrayIterator2[System.Data.Objects.ObjectStateEntry,System.Object]' cannot be converted to type System.Collections.Generic.IEnumerable1[PersonDetail]'.

Here what I had tried:

 IEnumerable<object>() addedEntities = // ... some Linq-To-Object query
 Type listType = typeof(List<>);
 Type constructed = listType.MakeGenericType(model.GetType());
 dynamic myList = Activator.CreateInstance(constructed);
 myList = addedEntities;

 MethodInfo mesthod = typeof(DynamicLinqExtensions).GetMethod("FilterByUniqueProp");
 MethodInfo genericMethod= mesthod.MakeGenericMethod(model.GetType());
 dynamic sameEntitiesInContext = genericMethod.Invoke(this, new object[] { myList, model });