Passing from a string parameter to use AddSingleton

Question

Why can't I do this?

     services.AddSingleton<Type.GetType("ShoppingCartCache",true)>();

OR is there a better way of passing from a string

Because `Type.GetType` is resolved at runtime but generic parameters must be resolved at compile time. — Wiktor Zychla, Jun 18 '20 at 12:50

score 0 · Answer 1 · answered Jun 18 '20 at 12:45

The method also has an overload to pass a type as parameter. So you can do:

services.AddSingleton(typeof(ShoppingCartCache));

Same also works with your example (although more prone to runtime errors):

services.AddSingleton(Type.GetType("ShoppingCartCache",true));

The reason it doesn't work is because generic types must be static, thus known at compilation.

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