interfaces as parameters of a function [duplicate]

Question

I have an issue, hope someone can help me a bit. I have the following interface :

public interface ITaskService
{
    ITaskBase GetTask(IRequestBase request);
}

i want to implement the method something like this :

public ITaskBase GetTask(Request request) 
{

}

Where the request is a model that looks like this :

public class Request:IRequestBase
{
    public DateTime CheckIn { get; set; }

    public DateTime CheckOut { get; set; }
}

I'm getting a compilation error that says the class does not implement the interface ITaskService , but I don't get it why the request parameter is inherited from the IRequestBase interface

Answer 1

Make ITaskService generic.

public interface ITaskService<T> where T : IRequestBase
{
    ITaskBase GetTask(T request);
}