使用在 C# 中的泛型类中定义的泛型参数调用泛型方法

问题描述

这是我的代码：

  class Program1
    {
        private static void Main(string[] args)
        {
            //MyClass myClass = new MyClass();
            //GetIdRequest getIdRequest = new GetIdRequest();
            //GetIdReponse getIdReponse= myClass.DoRequest(getIdRequest);
            //Console.WriteLine($"getIdReponse.Msg:" + getIdReponse.Msg + ",getIdReponse.Data:" + getIdReponse.Data);

            Type myClasstype = typeof(MyClass);
            Object myClasstypeInstance = System.Activator.CreateInstance(myClasstype);
            Type unboundGenericType = typeof(MyRequest<>);
            Type boundGenericType = unboundGenericType.MakeGenericType(typeof(GetIdRequest));

            Type getIdRequestType = typeof(GetIdRequest);
            Object getIdRequest = System.Activator.CreateInstance(getIdRequestType);


            MethodInfo methodInfo = myClasstype.getmethod("DoRequest",BindingFlags.Public| BindingFlags.Instance,null,new Type[] { boundGenericType },null);


            object res = methodInfo.Invoke(myClasstypeInstance,new object[] { getIdRequest });

            Console.ReadKey();
        }

    }
    public class MyClass
    {
        public T DoRequest<T>(MyRequest<T> obj) where T : MyReponse
        {
            T res = Activator.CreateInstance<T>();
            return res;
        }
    }

    public class GetIdRequest: MyRequest<GetIdReponse>
    {
    }

    public class GetIdReponse: MyReponse
    {
        public string Data { set; get; } = "data";
    }

    public interface MyRequest<T> where T: MyReponse
    {

    }

    public class MyReponse
    {
        public string Msg { set; get; } = "res";
    }

我想用运行时在泛型类中定义的泛型参数调用泛型方法但我得到了异常

"System.ArgumentException :"" TestPlatformApi.MyRequest `Genericarguments [0] on 1 [t] "" TestPlatformApi.GetIdRequest '违反类型't'的约束"

解决方法

正如 Charlieface 评论的那样，您应该取消对 MyRequest 的限制。
根据您的代码，我无法充分了解您的设计。所以，我只是在假设下展示了一些代码。

 public class MyClass<T> where T : MsgConstraint
    {
        private IList<T> middlewares = new List<T>();

        public void Register(T m)
        {
            middlewares.Add(m);
        }

        public T DoRequest(Type type)
        {
            return middlewares.Where(st => st.GetType() == type).FirstOrDefault();
        }
    }

    public interface MsgConstraint
    {
        public string Msg { set; get; }
    }

    public class HttpMsg : MsgConstraint
    {
        public string Msg { get; set; } = "HTTPMSG";
    }

    public class RpcMsg : MsgConstraint
    {
        public string Msg { get; set; } = "RPCMSG";
    }

    class Program
    {
        static void Main(string[] args)
        {
            MyClass<MsgConstraint> myClass = new MyClass<MsgConstraint>();
            myClass.Register(new HttpMsg());
            myClass.Register(new RpcMsg());
            MsgConstraint http = myClass.DoRequest(typeof(HttpMsg));
            Console.WriteLine(http.Msg);
            MsgConstraint rpc = myClass.DoRequest(typeof(RpcMsg));
            Console.WriteLine(rpc.Msg);
        }
    }

c#c#generics generics invoke invoke