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So far in this chapter, you ve seen how to use the Gestalt project to host IronPython and IronRuby code in Silverlight. You ve seen examples that use the Gestalt components hosted on http://gestalt.ironruby.net and http://gestalt.ironpython.net. You ve also seen how to download the Gestalt code and host the Gestalt components yourself. It s nice to leverage the Gestalt components in a Silverlight application. However, if you ever need to host your custom language code in Silverlight or if you want to target different DLR versions for your Silverlight application, you ll need to build your own Gestalt-like components. The rest of this chapter will show you how to do that, from the ground up. First, we will build a new custom language the Hello language you saw in 1. To host the custom language in Silverlight, we need to implement the provider side of the DLR Hosting API for the language. Second, we will host the Hello language in Silverlight without using Microsoft.Scripting.Silverlight.dll or any Gestalt-like components. In this exercise, you ll see that hosting a custom language in Silverlight is really no different from using a class library. Finally, we will create our custom Gestalt-like components and use them to host the Hello language in a Silverlight application. To follow these examples, you need to install some software components. You also need to build the Microsoft.Scripting.Silverlight project in the DLR source code. Let s go through those steps for setting up the development environment we need for this chapter s examples.

public Event GetNewEvent() { return Provider.GetNewEvent(); } [DataObjectMethod(DataObjectMethodType.Select)] public Event GetEvent(DomainKey key) { return Provider.GetEvent(key); } [DataObjectMethod(DataObjectMethodType.Select)] public EventCollection GetAllEvents() { return Provider.GetAllEvents(); } [DataObjectMethod(DataObjectMethodType.Select)] public EventCollection GetEventsByDate(DateTime targetDate) { return Provider.GetEventsByDate(targetDate); } [DataObjectMethod(DataObjectMethodType.Update)] public DomainKey SaveEvent(Event evt) { return Provider.SaveEvent(evt); } [DataObjectMethod(DataObjectMethodType.Delete)] public void DeleteEvent(Event evt) { Provider.DeleteEvent(evt); } public bool IsUsingLocation(Location location) { return Provider.IsUsingLocation(location); } #endregion #region " Provider Properties "

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Here are the software components you need in order to try out the examples in the rest of this chapter. You need to have Visual Web Developer 2010 Express installed. You need to have the Silverlight 4 Toolkit April 2010 Release and Silverlight 4 Tools for Visual Studio 2010 installed. The easiest way to install these components is to install Microsoft Web Platform Installer 2.0. Once it s installed, you can use it to download and install both components. Alternatively, you can go to the respective web sites for Silverlight 4 Toolkit April 2010 Release and Silverlight 4 Tools for Visual Studio 2010 to download and install them.

public EventProvider Provider { get {

After installing these software components, some people expressed in various discussion forums that they got an error message saying that Silverlight Developer Runtime is not installed. If you happen to run into that issue, you can fix it by downloading the Silverlight Developer Runtime at http://go.microsoft.com/fwlink/ LinkID=188039 and installing it.

return EventManager.GetProvider(ProviderName); } } private string _providerName = String.Empty; public string ProviderName { get { return _providerName; } set { _providerName = value; } } #endregion } } The EventDataObject uses a property called Provider that is simply a wrapper to get EventManager, which returns the named provider. Because the default constructor will be used with an ObjectDataSource, the value returned from the ProviderName property will always return a null value. When the EventManager is given a null value, it assumes the default provider is appropriate and the EventDataObject is able to function. If you wanted to use a different provider other than the default, you would have to programmatically instantiate either the EventDataObject and set the ProviderName property or directly use the EventManager to get access to the provider you want. Finally, we can declare the ObjectDataSource and bind it to a databound control, such as a Repeater. Listing 10-36 shows the event listing in a user control. Listing 10-36. EventListingControl.ascx <%@ Control Language="C#" AutoEventWireup="true" CodeFile="EventListingControl.ascx.cs" Inherits="Controls_EventListingControl" %> <h1>Event Listing</h1> <asp:Repeater ID="rptEvents" runat="server" DataSourceID="odsEventsByDate" OnItemDataBound="rptEvents_ItemDataBound"> <HeaderTemplate> <hr /> </HeaderTemplate>

Before we start coding, there s one last bit of preparation work that needs to be done building the DLR source code with Silverlight as the target platform. This is necessary because we will be building Silverlight applications and the DLR assemblies we ve been using so far are for.NET applications. The challenge here is that if you open the C:\Codeplex-DLR-1.0\Src\Codeplex-DLR-VSExpress.sln and try to build the Microsoft.Scripting.Silverlight project, you will get a bunch of compilation errors. Fortunately, a workaround was posted on the DLR Codeplex discussion forum and it works like a charm. Here s how to build the DLR source code for Silverlight. 1. 2. Open the Visual Studio command prompt. The command prompt seems to be installed as part of the installation of Visual Studio C++ 2010 Express. In the command prompt, navigate to the C:\Codeplex-DLR-1.0\Src folder and execute the following command:

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