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Figure 4 15. Error due to having specified no value for the page parameter How is the MVC Framework supposed to invoke your List() method when it doesn t know what value to supply for page If the parameter were of a reference or nullable type,13 it would just pass null, but int isn t one of those, so it has to throw an error and give up. As an experiment, try changing the URL in your browser to http://localhost:xxxxx/ page=1 or http://localhost:xxxxx/ page=2 (replacing xxxxx with whatever port number was already there). You ll find that it works, and your application will select and display the relevant page of results. That s because when ASP.NET MVC can t find a routing parameter to match an action method parameter (in this case page), it will try to use a query string parameter instead. This is the framework s model binding mechanism, which is explained in detail in 12. Of course, your site still needs to work when somebody visits the root URL without any query string value, so let s define the default page index.

In this function, we are using the SharePoint Object Model on the server side to obtain a reference to the Connection Strings list that we created to store the database connection string. Then, we are building a CAML query to access the list, and returning the value. This portion of accessing data through a data connection is now ready to be deployed and tested.

A nullable type is a type for which null is a valid value. Examples include object, string, System.Nullable<int>, and any class you define. These are held on the heap and referenced via a pointer (which can be set to null). That s not the case with int, DateTime, or any struct, which are held as a block of memory in the stack, so it isn t meaningful to set them to null (there has to be something in that memory space).

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string connStringName = String.Empty; private Database db; #endregion #region " Implementation Methods "

It s very easy to tell ASP.NET MVC what value to use for an action method parameter if no other value is available. Update ProductsController s List() method signature by applying a [DefaultValue] attribute: public ViewResult List([DefaultValue(1)] int page) { // ... method body as before ... } Now if you run the application with no query string values, you ll see the error message has gone, and you ll be shown only the first page of products (as in Figure 4 16).

Figure 4 16. The paging logic selects and displays only the first four products If you re using Visual Studio 2010 even if your project targets .NET 3.5 you can use C# 4 s optional parameter syntax to express the default value for page. Here s how it would look: public ViewResult List(int page = 1) { // ... method body as before ... }

CAML is an underlying XML language that is used in SharePoint throughout the product. You can query a list either directly through CAML as we have done in the previous example, or by using LINQ to SharePoint, which is a new feature in SharePoint 2010. We will cover a LINQ to SharePoint example later in the book. For more information about CAML, here are some other resources the first two links had not at the time of the book writing been updated for Office 12 but are still accurate for Office 12/SharePoint 2010:

At runtime, ASP.NET MVC uses reflection to look for any such default value embedded by the compiler in your assembly s metadata. If there is no default value, ASP.NET MVC looks for a [DefaultValue] attribute instead.

/// <summary> /// SQL Implementation /// </summary> public override void Initialize(string name, NameValueCollection config) { if (config == null) { throw new ArgumentNullException("config"); } if (String.IsNullOrEmpty(name)) { name = "SqlPhotoAlbumProvider"; } if (String.IsNullOrEmpty(config["description"])) { config.Remove("description"); config.Add("description", "SQL Photo Album Provider"); } base.Initialize(name, config); if (config["connectionStringName"] == null) { throw new ProviderException( "Required attribute missing: connectionStringName"); } connStringName = config["connectionStringName"].ToString(); config.Remove("connectionStringName");

Note ASP.NET MVC supports [DefaultValue] for backward compatibility with Visual Studio 2008. In this tutorial, I won t use C# 4 s optional parameter syntax; I ll instead use [DefaultValue] because it works equally well for all readers.

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