Passing a Type to a generic method at runtime [duplicate]

Question

I have something like this

Type MyType = Type.GetType(FromSomewhereElse);

var listS = context.GetList<MyType>().ToList();

I would like to get the Type which is MyType in this case and pass it to the Generic Type method GetList

This is the error I am getting:

The type or namespace name 'MyType' could not be found (are you missing a using directive or an assembly reference?)

Answer 1

You can use reflection and construct your call like this:

Type MyType = Type.GetType(FromSomewhereElse);

var typeOfContext = context.GetType();

var method = typeOfContext.GetMethod("GetList");

var genericMethod = method.MakeGenericMethod(MyType);

genericMethod.Invoke(context, null);

Note that calling methods with reflection will add a huge performance penalty, try to redesign your solution if possible.

Answer 2

You'll have to use reflection:

var method = context.GetType()
    .GetMethod("GetList").MakeGenericMethod(MyType)

IEnumerable result = (IEnumerable)method.Invoke(context, new object[0]);
List<object> listS = result.Cast<object>().ToList();

However there's no way to use your type instance MyType as a static type variable, so the best you can do is to type the results as object.