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Extension Methods of a Struct?
f#

I have this Point extension in C# code:

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public static class PointExtensions
{
        public static int ToInt32(this Point point)
        {
            return 0;
        }
}

When I try to use it in F# like this

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let p = new Point(1,1)
let x = p.ToInt32(p)

I am getting this exception:

System.InvalidProgramException: JIT Compiler encountered an internal limitation.

What is the problem?

.

You need....

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let p = new Point(1,1)


let x = p.ToInt32()  // <- empty parameter list

I don't know how you got that particular error. When I entered the F#

code into the editor intellisense picked up the error and prompted with

correct signature.

It's all working nicely in my VS 2010. I've done some C#/F# interoperability in VS 2008 with

the 1.9.6.16 and found it worked also.

When you've got that going, you might like try this, just to see it all hanging together...

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        public static int ToInt32(this Point point)
        {
            return point.X;
        }

F#...

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let mutable p = new System.Drawing.Point(1,1)
p.X <- 100
System.Console.WriteLine(sprintf "x is %i" (p.ToInt32()))
By on 6/12/2009 10:43 PM ()

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