Wednesday, November 12, 2008

Using Reflection to Instantiate a Generic Type

How to use Activator.CreateInstance to instantiate a generic type based on a name and type parameters? It's not quite as simple as I thought. First mark the fully qualified name of the class by appending a backquote (`) and the number of type arguments. Then you can do make the type generic by calling the MakeGenericType method and passing in the types.

string generic = string.Format("{0}`{1}", _className, _genericTypeParams.Count);
Type genericType = Type.GetType(generic).MakeGenericType(_genericTypeParams.ToArray());

x = Activator.CreateInstance(genericType);


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