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    <p>Yes, you can host a WCF Data Service in your own assembly - with a few little tricks. I researched this a while ago and came up with these steps / instructions.</p> <p>Here's how:</p> <ul> <li><p>put your data model (EF Data Model) into its own assembly, let's call it <code>DataModel</code></p></li> <li><p>create a new class library project (call it <code>MyDataServiceHost</code>)</p></li> <li><p>add a few references:</p> <ul> <li>your <code>DataModel</code> assembly with the data layer</li> <li><code>System.ServiceModel</code></li> <li><code>System.ServiceModel.Web</code></li> <li><code>System.Data.Services.Client</code></li> <li><code>System.Data.Services</code> - you cannot pick this from the usual <code>Add Reference</code> dialog under the .NET category - you need to browse for the assembly file. Find the directory <code>C:\Program Files\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.0</code> (or <code>C:\Program Files (x86)\...</code> on a 64-bit machine) and pick the <code>System.Data.Services.dll</code> inside it</li> </ul></li> <li><p>add a new class to that class library and call it e.g. <code>YourDataService.cs</code> - it will look something like this:</p> <pre><code>using System.Data.Services; using System.Data.Services.Common; using DataModel; namespace MyDataServiceHost { public class YourDataService : DataService&lt;YourModelEntities&gt; { // This method is called only once to initialize service-wide policies. public static void InitializeService(DataServiceConfiguration config) { // TODO: set rules to indicate which entity sets and service operations are visible, updatable, etc. // Examples: config.SetEntitySetAccessRule("*", EntitySetRights.AllRead); config.DataServiceBehavior.MaxProtocolVersion = DataServiceProtocolVersion.V2; } } } </code></pre> <p>You can name the class anything you like, and it has to derive from <code>DataService&lt;T&gt;</code> where <code>T</code> is the name of your data model; if you're using Entity Framework, it's the name of your object context class - typically something like <code>(database)Entities</code> or whatever you picked when you created the EDM</p></li> <li><p>add another class to your new project, call it <code>MyDataServiceHost.cs</code> and it will look something like this:</p> <pre><code>using System; using System.Data.Services; using DataModel; namespace MyDataServiceHost { public class MyDataServiceHost { public static void LaunchDataService(string baseAddress) { Uri[] baseAddresses = new Uri[1]; baseAddresses[0] = new Uri(baseAddress); using(DataServiceHost host = new DataServiceHost(typeof(YourDataService), baseAddresses)) { host.Open(); Console.WriteLine("DataService up and running....."); Console.ReadLine(); host.Close(); } } } } </code></pre> <p>It instantiates a DataServiceHost, which is derived from WebServiceHost (which in turn is derived from ServiceHost) and it will spin up the WCF Data Service runtime for you.</p></li> <li><p>now you can start up your WCF Data Service from any app using:</p> <pre><code>MyDataServiceHost.LaunchDataService("http://localhost:4444/YourService"); </code></pre></li> <li><p>last thing to remember: the app that you use to launch the WCF Data Service <strong>must have</strong> the connection string (the EDM connection string, if you're using Entity Framework) in its app.config (or web.config) in order for this to work!</p></li> </ul>
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    1. CO+1 Simply genius answer marc!
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