CODEWITHSUNDEEP
c#interfacestruct
William Jockusch
William Jockusch

Reputation: 27295

Declare an interface that a struct conforms to

I need a PointF-like struct in PCL code. But System.Drawing is not available. So I declare my own struct:

public struct PointFF: IPointF {
  public float X { get; set; };
  public float Y { get; set; };
}

Now I want to define an interface IPointF that both PointF and PointFF conform to:

interface IPointF {
  float X {get; set; };
  float Y {get; set; };
}

Lastly, I want to somehow "make it official" that PointF conforms to IPointF, so I can do things like this:

public void DoFunkyStuff (IPointF p) {
  float x = p.X;
  float y = p.Y;
  // do something with x and y
}

Is that possible?

Upvotes: 0

Views: 108

Answers (1)

Michael Edenfield
Michael Edenfield

Reputation: 28338

No, it's no possible for you do to what you want.

In general, though it is possible for structures to implement interfaces, it's considered a very bad idea. It forces your structures to be boxed, and tends to break the value-type semantics you expect from a structure. But the language permits it, so that's not your main problem.

What you can't do is to somehow arrange from a pre-existing structure to implement that interface without changing it's source code. Since you have no control over System.Drawing.PointF, there's nothing you can do to convince the compiler that it implements your IPointF.

Upvotes: 3

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