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POF# WebApi using record types doesn't give the desired XML output
 

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    <p><strong>The working code is at the bottom of this question!</strong></p> <p><strong>With the following WebApi controller in F#:</strong></p> <pre><code>namespace FsWeb.Controllers open System.Web open System.Web.Mvc open System.Net.Http open System.Web.Http open Microsoft.FSharp.Linq; open Microsoft.FSharp.Data.TypeProviders; type dbSchema = SqlDataConnection&lt;"conn string"&gt; [&lt;CLIMutable&gt;] type ViewModelRec = { CustomerId : string } type ValuesController() = inherit ApiController() let db = dbSchema.GetDataContext() do db.DataContext.Log &lt;- System.Console.Out // GET /api/values member x.Get(take:int, skip:int) = let t = take let s = skip query { for row in db.Reservations do skip s take t select { CustomerId = row.CustomerId.ToString() } } </code></pre> <p><strong>The XML output is:</strong></p> <pre class="lang-xml prettyprint-override"><code>&lt;ArrayOfViewModelRec xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/FsWeb.Controllers"&gt; &lt;ViewModelRec&gt; &lt;CustomerId_x0040_&gt;A98971F0-5F93-4F0D-B5AC-95E161458381&lt;/CustomerId_x0040_&gt; &lt;/ViewModelRec&gt; &lt;ViewModelRec&gt; &lt;CustomerId_x0040_&gt;60DF7CF6-91FB-4BBE-AD6B-FE0CAA32F60E&lt;/CustomerId_x0040_&gt; &lt;/ViewModelRec&gt; &lt;ViewModelRec&gt; &lt;CustomerId_x0040_&gt;84506E40-139C-4DD1-B396-3CE13DC20996&lt;/CustomerId_x0040_&gt; &lt;/ViewModelRec&gt; &lt;ViewModelRec&gt; &lt;CustomerId_x0040_&gt;D9FABC12-9B19-46C2-9776-E31171A302D5&lt;/CustomerId_x0040_&gt; &lt;/ViewModelRec&gt; &lt;ViewModelRec&gt; &lt;CustomerId_x0040_&gt;B1B6C617-AA0E-46A9-A0B6-312A229BE178&lt;/CustomerId_x0040_&gt; &lt;/ViewModelRec&gt; &lt;ViewModelRec&gt; &lt;CustomerId_x0040_&gt;BAB194AE-CD2C-400F-B81E-2A293C50C404&lt;/CustomerId_x0040_&gt; &lt;/ViewModelRec&gt; &lt;ViewModelRec&gt; &lt;CustomerId_x0040_&gt;AE001AB4-8410-43BF-9C93-AE5A2EACFDF5&lt;/CustomerId_x0040_&gt; &lt;/ViewModelRec&gt; &lt;ViewModelRec&gt; &lt;CustomerId_x0040_&gt;2DDBDB91-9307-4BF7-865F-C6237D09D542&lt;/CustomerId_x0040_&gt; &lt;/ViewModelRec&gt; &lt;ViewModelRec&gt; &lt;CustomerId_x0040_&gt;A3E93E5C-2B7E-4B8D-8AAD-AD245E32093F&lt;/CustomerId_x0040_&gt; &lt;/ViewModelRec&gt; &lt;ViewModelRec&gt; &lt;CustomerId_x0040_&gt;B64B814F-9B4C-46BD-A804-648309FA7DD0&lt;/CustomerId_x0040_&gt; &lt;/ViewModelRec&gt; &lt;/ArrayOfViewModelRec&gt; </code></pre> <p>When I use a class instead, the naming looks correct (without the <em>x0040</em> tag).</p> <p>Anyone a suggestion?</p> <p><strong>Updated: Solution:</strong></p> <pre><code>namespace FsWeb.Controllers open System.Web open System.Web.Mvc open System.Net.Http open System.Web.Http open System.Runtime.Serialization; open Microsoft.FSharp.Linq; open Microsoft.FSharp.Data.TypeProviders; type dbSchema = SqlDataConnection&lt;"here comes the connection string"&gt; [&lt;DataContract&gt;] type ViewModelRec = { [&lt;field: DataMember(Name="CustomerId")&gt;] CustomerId : string } type ValuesController() = inherit ApiController() let db = dbSchema.GetDataContext() do db.DataContext.Log &lt;- System.Console.Out member x.Get(take:int, skip:int) = let t = take let s = skip query { for row in db.Reservations do skip s take t select { CustomerId = row.CustomerId.ToString() } } </code></pre>
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