如何将对象转换为仅知道类名称的类？

Question

I am a C# NewBie and I'm in a situation where i know the type of the object (ClassName) in

ObservableCollection<ClassName>

and now i need to use it to cast returning object of the same thats comes as an

ObservableCollection<object>

how do i do somethign like

ObservableCollection<type> where type s the Type of ClassName? is it possible when i have the type of the ClassName i can use it instead of the ClassName if not how do i achive it?

Answer 1

Generic parameters on concrete classes are never co-variant. And on interface they can only be variant if they are either used as input or output parameter, but never both.

So you can't ever cast ObservableCollection<T> to ObservableCollection<object> .

Check out Covariance and Contravariance in Generics

Answer 2

I'm a bit confused by your wording, do you mean you want:

typeof(ClassName)

?

Answer 3

尝试这个：

return new ObservableCollection<object>(myClassNameObservableCollection);

Answer 4

From the last sentence of your question I guess you need that

Type.MakeGenericType

So you can do something like that:

Type generic = typeof(ObservableCollection<>);
Type[] typeArgs = { typeof(ClassName) };
Type constructed = generic.MakeGenericType(typeArgs);
var obj = Activator.CreateInstance(constructed);