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Websharper client use classes of portable c# class library
websharperf#javascript

Hi
We have a portable c# library containing our domain model (and interfaces).
I'm experimenting with WebSharper and I wonder if it's possible to use the domain model from [<JavaScript>] fsharp.
I understand WebSharper won't compile the C# IL to JS, but I thought maybe I can just use the type's properties while we would generate code using just plain js-Objects for those types(and ignoring their implementations).
When trying to use a type from a C# Assembly, I get some build errors like:

The type 'Lazy`2' is required here and is unavailable. You must add a reference to assembly 'System.ComponentModel.Composition, Version=4.0.0.0, Culture=neutral,

A reference to the type 'System.ValueType' in assembly 'System.Runtime' was found, but the type could not be found in that assembly

Is this supported in any way?
Or maybe there could be even a typeprovider for random non-F# assemblies generating from IL? :D

Thanks.

.

It looks like what you need is the Proxy functionality.

For example, if I have the following type in C#:

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class Example
{
    public Example(int property)
    {
	Property = property;
    }

    public int Property { get; private set; }
}

then I can write a new type ExampleProxy in F# and mark it as a proxy for Example:

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open IntelliFactory.WebSharper

[<Proxy(typeof<Example>)>]
type ExampleProxy [<JavaScript>] (p: int) =

    let mutable property = p

    member this.Property
        with [<JavaScript>] get() = property
        and [<JavaScript>] private set v = property <- v

This way, when WebSharper tries to translate a call to a constructor or method of the class Example, it will use the corresponding method from ExampleProxy instead:

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module Test =

    [<JavaScript>]
    let f() =

        // in JS, the constructor for ExampleProxy is called
        let ex = new Example(12)

        // same here, ExampleProxy.Property getter is called
        ex.Property

The error messages you show here seem to be about something else, though; it looks like your C# library depends on some assemblies and your WebSharper project needs to reference them as well.

By on 6/27/2013 1:55 PM ()

Thank you. The thing is, using a type from the portable lib only fails when I reference Websharper targets.
Basically Websharper fails as soon as I reference the portable c# project.
I'm using the latest Alpha 2.5.x from Nuget. I should probably put up a sample...
A question, can I also use the "Example" type without a proxie, when I only want to access some properties (doesn't need to generate a js function type, can be an anonymous object)?

By on 6/29/2013 6:58 AM ()

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