如何将接口类型对象添加到列表中接口类型具有通用类型的列表

Question

如何将接口添加到列表接口类型具有通用类型的位置？

相同的代码段，

namespace MyNamespace
{
    public interface ITest<TMessageKey, TEventMessage, TProducerSetting, TProducerClient>
    {
        Task ProcesMessage(Func<TMessageKey, TEventMessage, TProducerSetting, IResult<TEventMessage>> message);
    }

    public class Test<TMessageKey, TEventMessage, TProducerSetting, TProducerClient> : ITest<TMessageKey, TEventMessage, TProducerSetting, TProducerClient>
    {
        public async Task ProcesMessage(Func<TMessageKey, TEventMessage, TProducerSetting, IResult<TEventMessage>> message)
        {
            Console.WriteLine("Processed...");
        }
    }


    public interface IResult<TEventMessage>
    {
        TEventMessage ProcessedMessage { get; set; }
        bool Status { get; set; }
    }

    public class Result<TEventMessage> : IResult<TEventMessage>
    {
        public TEventMessage ProcessedMessage { get; set; }
        public bool Status { get; set; }
    }

    public interface IType { }
    public class Message { }
    public class Message1 : Message { }
    public class Message2 : Message { }
    public class Message3 : Message { }
    public class TestProducerSetting { }
    public class SomeClient { }

    public class Execute
    {
        private List<ITest<string, Message, TestProducerSetting, SomeClient>> lst = new();

        public void TestMethod()
        {
            ITest<string, Message1, TestProducerSetting, SomeClient> test1 = new Test<string, Message1, TestProducerSetting, SomeClient>();
            ITest<string, Message2, TestProducerSetting, SomeClient> test2 = new Test<string, Message2, TestProducerSetting, SomeClient>();
            ITest<string, Message3, TestProducerSetting, SomeClient> test3 = new Test<string, Message3, TestProducerSetting, SomeClient>();

            var res1 = test1.ProcesMessage(Method1);
            var res2 = test2.ProcesMessage(Method2);
            var res3 = test3.ProcesMessage(Method3);

            //Compile time error comes here
            lst.Add(test1);
            lst.Add(test2);
            lst.Add(test3);
        }

        private IResult<Message1> Method1(string messageKey, Message1 message, TestProducerSetting setting)
        {
            return new Result<Message1> { ProcessedMessage = message, Status = true };
        }

        private IResult<Message2> Method2(string messageKey, Message2 message, TestProducerSetting setting)
        {
            return new Result<Message2> { ProcessedMessage = message, Status = true };
        }

        private IResult<Message3> Method3(string messageKey, Message3 message, TestProducerSetting setting)
        {
            return new Result<Message3> { ProcessedMessage = message, Status = true };
        }
    }
}

以下是实时 test1，test2和test3对象是在循环中创建的。
请注意，“ ProcesMessage”采用了输入的功能输入，其中teventMessage在输入中以及返回类型的一部分。我无法使用协方差和违反能力来实现这一目标。

请注意，仅对于我手动创建对象的查询。 可以解决吗？