CODEWITHSUNDEEP
c#oopinterface
Ropstah
Ropstah

Reputation: 17794

How to implement interface in derived class or through partial classes?

I have a partial class being generated by a tool.

Foo.cs

public partial class Foo {
    [SomeAttribute()]
    public string Bar {get;set;}
}

I need to implement the following interface for Foo without touching Foo.cs:

IFoo.cs

public interface IFoo {
    string Bar {get;set;}
}

Extending Foo is also an option, but re-implementing the Bar property isn't.

Can this be done?

Upvotes: 5

Views: 3542

Answers (3)

ken2k
ken2k

Reputation: 48975

As Bar is private, here's what you're looking for:

public partial class Foo : IFoo
{
    string IFoo.Bar
    {
        get
        {
            return this.Bar;  // Returns the private value of your existing Bar private field
        }
        set
        {
            this.Bar = value;
        }
    }
}

Anyway, this is confusing and should be avoided if possible.

EDIT: Okay, you've changed your question, so as Bar is now public, there is no more problem as Bar is always implemented in Foo.

Upvotes: 1

Fabian Nicollier
Fabian Nicollier

Reputation: 2861

You could create a partial class for Foo that implements IFoo but with the Bar property not being public it won't work.

If Bar property was public:

partial class Foo
{
    public string Bar { get; set; }
}

interface IFoo
{
    string Bar { get; set; }
}

partial class Foo : IFoo
{

}

Upvotes: 1

Tomislav Markovski
Tomislav Markovski

Reputation: 12346

What prevents you from doing this again in another file?

public partial class Foo : IFoo
{
}

Since Bar property already exists, it wont be needed to reimplement it.

Or in a new class

public class FooExtended : Foo, IFoo
{
}

Again, you won't need to implement Bar since Foo implements it already.

Upvotes: 8

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