T型通用接口，其中

Question

I try my first steps into generic interfaces and have this interface:

public interface ISetting<T>
{
    T Value { get; }
}

And a implementation like this:

public class MySetting : ISetting<DateTime> 
{ 
    DateTime Value { get; }
}

Now my target is, that I can write my code like this in my service layer:

public class MyService
{
    public DateTime GetMySetting()
    {
        return MyDataLayer.GetSettings<MySetting>();
    }
}

So in my DataLayer i am struggling with my implementation of my generic and where:

public T ReadOrAddOne<T>() where T : ISetting<????>
{
    // My Code goes here
}

So how to tell my ISetting which Type I am awaiting?

Answer 1

You just need to define another letter to represent that type.

public T ReadOrAddOne<T,R>() where T : ISetting<R>
{
    return default(T);
}