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f# linq to xml
f#linq

I want to use linq in f# to print xml. I'm having trouble since most of the examples online are out of date. Is there some way to pretty up the syntax? Also, what modules need to be included?

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open System
open System.Collections.Generic
open System.Linq
open System.Xml
open System.Xml.Linq


type Segment( id:int ) =
    member x.Id = id
     
    override x.ToString() =
        (new XDocument(
                new XDeclaration("1.0", "utf-8", "yes"),
                Array.init 1 ( fun _ -> new XElement(
                       XName.Get("Segment"), new XElement( XName.Get("id"), x.id) ) :> obj ))).ToString()
.

Also, what modules need to be included?

See the docs for XDocument/...:

Namespace: <mshelp:link tabindex="0" keywords="N:System.Xml.Linq">System.Xml.Linq</mshelp:link>
Assembly:

System.Xml.Linq (in System.Xml.Linq.dll)

My try on the formatting:

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#r "System.Xml.Linq"

open System.Xml.Linq

// http://cs.hubfs.net/forums/thread/11005.aspx
let inline (!>) arg = ( ^a : (static member op_Implicit : ^b -> ^a) arg)

type Segment( id:int ) =
    member x.Id = id
    
    override x.ToString() =
        let root =
            XDocument(
                XDeclaration("1.0", "utf-8", "yes"),
                [| box <| XElement(!> "Segment", 
                    XElement(!> "id", x.Id))
                |]
            )
        root.ToString()

Looks like 

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[| x :> T |]

isn't valid, not sure why...

error FS0010: Unexpected symbol ':>'" " in interaction. Expected '|]' or other token.

By on 7/23/2009 6:27 AM ()

That still seems like a verbose transcription of what I would write in C#. I was thinking more along the lines of an f# specific library that handles the casting and the generation of single element arrays.

If nothing like that exists, it's not too difficult to write it. But, looking through the tutorials, it seems like at one time there was at one time a ``Microsoft.FSharp.Xml.Linq'' namespace.

By on 7/24/2009 4:59 AM ()

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