C# and specialized generic method - how to implement it?

Question

Hi,
I'm trying to make a highly specialized version of generic method that my class inherits from its ancestor:

public class Request<K>
{
    public K Id;
}

public class Response<T>
{
    public T Data;
}

public class MyDto
{
}


public abstract class BaseStorage
{
    public virtual Response<T> GetDemo<T, K>(Request<K> request)
    {
    }
}


public class ChildStorage : BaseStorage
{
    public override Response<MyDto> GetDemo<MyDto, int>(Request<int> request)
    {
        return new Response<MyDto>();
    }
}

How should I write my specialized GetDemo() implementation w/o compiler errors?

Answer 1

@senglory , you could try the following code to implment the generic method from the abstract class without the compliler errors.

public abstract class BaseStorage  
    {  
        public  abstract Response<T> GetDemo<T,K>(Request<K> request);  
    }  
  
  
    public class ChildStorage : BaseStorage  
    {  
        public override Response<T> GetDemo<T, K>(Request<K> request)  
        {  
           return new Response<T>();  
        }  
    }  

You could call it like the following code:

    Request<int> request = new Request<int>();    
    request.Id = 1;  
    Response<MyDto> response = new Response<MyDto>();  
    response.Data = new MyDto { Name="test1" ,Description="d1"};  
    ChildStorage storage = new ChildStorage();  
    Response<MyDto> response1 = storage.GetDemo<MyDto, int>(request);  

Hope this could help you.

Best Regards,
Jack

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Answer 2

Also I found another solution:

public abstract class BaseStorage<T, K>
{
    public virtual Response<T> GetDemo(Request<K> request)
    {
        throw new NotImplementedException();
    }
}


public class ChildStorage : BaseStorage<MyDto, int>
{
    public override Response<MyDto> GetDemo(Request<int> request)
    {
        return new Response<MyDto>();
    }
}