C#•3y ago

Is there a way to call generic methods through Type (from typeof or GetType) (without reflection)

like T Create<T>(); Type a = typeof(xxx);

18 Replies

Can you clarify

scixingOP•3y ago

 Type a = typeof(GameObject);
  CreateGameObject<a>();

 Type a = typeof(GameObject);
  CreateGameObject<a>();

like this This cannot be compiled. I want to know if there is any way to realize this function without reflection

Unknown User•3y ago

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scixingOP•3y ago

Thank you. I want to create a new instance through the type name in the configuration file, but there seems to be no simple way to use generic eyesbleed

may need a lot of switch to do this. If I can, I don't want to do this

Unknown User•3y ago

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scixingOP•3y ago

public static Type GetModelType(string name)
        {
            // get type
            throw new NotImplementedException();
        }
        public static object CreateGameObject(GameObjectSave save)
        {
            string typename = save.TypeName;
            Type type = GetModelType(typename);
            return CreateGameObject<Unit>("some obj");
            // CreateGameObject<type>("some obj");
            
        }

public static Type GetModelType(string name)
        {
            // get type
            throw new NotImplementedException();
        }
        public static object CreateGameObject(GameObjectSave save)
        {
            string typename = save.TypeName;
            Type type = GetModelType(typename);
            return CreateGameObject<Unit>("some obj");
            // CreateGameObject<type>("some obj");
            
        }

'Type' is a runtime type. I wonder if there is any way to directly call generic methods through Type, Well, it seems to violate the design idea of C#, which may be bigthonk

Unknown User•3y ago

Message Not Public

scixingOP•3y ago

Because some restrictions cannot be deserialized directly, it must be generated through the configuration file

Unknown User•3y ago

Message Not Public

scixingOP•3y ago

Because it contains unity gameobject It's not important. I mainly want to know whether there is a similar way to do this

public static object CreateGameObject(GameObjectSave save)
        {
            string typename = save.TypeName;
            Type type = GetModelType(typename);
            var method =  type.GetMethod("CreateGameObject").MakeGenericMethod(type);
            return method.Invoke(null, new object[] {"dani", save});
            // return CreateGameObject<Unit>("some obj");
            // CreateGameObject<type>("some obj");
            
        }

public static object CreateGameObject(GameObjectSave save)
        {
            string typename = save.TypeName;
            Type type = GetModelType(typename);
            var method =  type.GetMethod("CreateGameObject").MakeGenericMethod(type);
            return method.Invoke(null, new object[] {"dani", save});
            // return CreateGameObject<Unit>("some obj");
            // CreateGameObject<type>("some obj");
            
        }

use reflection

Unknown User•3y ago

Message Not Public

Thinker•3y ago

Yes, this is impossible without reflection, and you certainly don't want to use reflection in a game due to its major performance impact.

Up•3y ago

can't you simply use an interface?

IMyThing thing = HoweverYouLoadTheThing();
GameObject GameObj = thing.CreateGameObject();

IMyThing thing = HoweverYouLoadTheThing();
GameObject GameObj = thing.CreateGameObject();

scixingOP•3y ago

This does not seem to solve the problem of initializing to the specified type(? In HowerYouLoadTheThing, I still encounter corresponding problems

Up•3y ago

well what you could do is a 2-step process, then: have some kind of registry of object providers, mapped to a string ID. then when loading, you read that string ID, retrieve the provider for that type, and feed it the rest of the file to turn it into an object.

scixingOP•3y ago

This may lead to a lot of switch or other codes. If possible, I want to avoid them. But it seems that I can only do this, or ignore performance and use nervousowo

is used in CreateGameObject<T>

Up•3y ago

one single dictionary lookup when deserializing, no other switches needed.

Accord•3y ago

✅ This post has been marked as answered!

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Is there a way to call generic methods through Type (from typeof or GetType) (without reflection)