具有两个通用参数的接口，自动求解一个 [英] Interface with two generic parameters, solve one automatically

问题描述

因此，我正在为我的模型和项目中的服务创建接口.我创建的第一个接口是用于持久性实体的接口，我将其设置为通用类型，因为该实体可以具有类型为'int'或'Guid'的ID.

So I'm creating interfaces for my models and for my services in my project. The first interface I created was one for persistent entities, I set it up with a generic as the entity could have an Id of type 'int' or 'Guid'.

public interface IPersistentEntity<T>
{
    T Id { get; set; }
}

此后，我继续为处理持久性实体的服务创建接口，最终这样.

After this, I went on to create the interface for the services that would deal with Persistent entities, which ended up like this.

public interface IPersistentEntityService<TPersistentEntity, T>
    where TPersistentEntity : IPersistentEntity<T>
{
    TPersistentEntity Get(T id);
}

现在，这很好用，我想知道是否可以通过一种方式来设置接口，以便在考虑到服务中使用的实体的情况下自动解决Id的类型.

Now, this works just fine, the thing is I'm curious if it is possible to set up the interface in a way where the type for the Id is solved automatically taking into account the entity used in the service.

使用代码，如果我想创建一个服务，我就已经做了类似的事情.

With the code, I've done if I want to create a service I would need to do something like this.

public partial class User : IPersistentEntity<int>
{
    public int Id { get; set; }
}

public class UserService : IPersistentEntityService<User, int>
{
    public User Get(int id)
    {
        throw new NotImplementedException();
    }
}

我希望它像

public class UserService : IPersistentEntityService<User>
{
    public User Get(int id)
    {
        throw new NotImplementedException();
    }
}

注意，我将不再指示类中使用的类型(在这种情况下为"int")，这是我希望以某种方式自动解决的问题.

Note I would no longer be indicating the type used in the class ("int" in this case), which is the thing I would like to be resolved automatically somehow.

这有可能吗?

推荐答案

以下内容是否会满足您的需求?

Would something like the following do what you're looking for?

public class UserService : IPersistentEntityService<User, int>
{
    public User Get<U>(U id)
    {
        Console.WriteLine(typeof(U));
        return null;
    }
}

public interface IPersistentEntityService<TPersistentEntity, T>
    where TPersistentEntity : IPersistentEntity<T>
{
    TPersistentEntity Get<U>(U id);
}

void Main()
{
    UserService service = new UserService();
    service.Get<int>(23);
}

这篇关于具有两个通用参数的接口，自动求解一个的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！