Add 'set' to properties of interface in C#

Question

I am looking to 'extending' an interface by providing set accessors to properties in that interface. The interface looks something like this:

interface IUser
{
    string UserName
    {
        get;
    }
}

I want something like this:

interface IMutableUser : IUser
{
    string UserName
    {
        get;
        set;
    }
}

I need the inheritence. I cannot copy the body of IUser into IMutableUser and add the set accessors.

Is this possible in C#? If so, how can it be accomplished?

Answer 1

I don't see any reason why what you have posted shouldn't work? Just did a quick test and it compiles alright, but gives a warning about hiding. This can be fixed by adding the new keyword, like this:

public interface IMutableUser : IUser
{
    new string Username { get; set; }
}

An alternative would be to add explicit set methods; eg:

public interface IMutableUser : IUser
{
    void SetUsername(string value);
}

Of course, I'd prefer to use setters, but if it's not possible, I guess you do what you have to.