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Traditionally, when you wanted to create a new content type in Drupal, you would write a node module that took responsibility for providing the new and interesting things your content type needed. We say traditionally because recent advents within the Drupal framework allow you to create content types within the administrative interface and extend their functionality with contributed modules rather than writing a node module from scratch. I ll cover both solutions within this chapter. I ll write a node module that lets users add a job posting to a site. A job posting node will include a title, a body where the details of the job posting will be entered, and a field where the user can enter the name of the company. For the job posting title and a body, I ll use the built-in node title and body that are standard with all Drupal nodes. I ll need to add a new custom field for the company s name. I ll start by creating a folder named job_post in your sites/all/modules/custom directory.

Out of the box, the ADO.NET DataSet (and related types such as DataTable and DataView) do not have the necessary infrastructure to be a direct target for a LINQ query. For example, the following method (which uses types in the AutoLotDisconnectedLayer namespace) results in a compile-time error: static void LinqOverDataTable() { // Get a DataTable of data. InventoryDALDisLayer dal = new InventoryDALDisLayer( @"Data Source=(local)\SQLEXPRESS;" + "Initial Catalog=AutoLot;Integrated Security=True"); DataTable data = dal.GetAllInventory(); // Apply a LINQ query to the DataSet var moreData = from c in data where (int)c["CarID"] > 5 select c; } If you were to compile the LinqOverDataTable() method, the compiler would inform you that the DataTable type provides a query pattern implementation. Similar to the process of applying LINQ queries to objects that do not implement IEnumerable<T>, ADO.NET objects must be transformed into a compatible type. To understand how to do so requires examining the types of System.Data.DataSetExtensions.dll.

The System.Data.DataSetExtensions.dll assembly, which is referenced by default in all Visual Studio 2010 projects, augments the System.Data namespace with a handful of new types (see Figure 22-27).

The install file for the job post module performs all of the set-up operations for things like defining the node type, creating the fields that make up our new node type, and handling the uninstall process when an administrator uninstalls the module.

Figure 22-27. The System.Data.DataSetExtensions.dll assembly The two most useful types by far are DataTableExtensions and DataRowExtensions. These classes extend the functionality of DataTable and DataRow by using a set of extension methods (see 12). The other key class is TypedTableBaseExtensions, which defines extension methods that you can apply to strongly typed DataSet objects to make the internal DataTable objects LINQ aware. All of the remaining members within the System.Data.DataSetExtensions.dll assembly are pure infrastructure, and they are not intended to be used directly in your code base.

Now let s look at how you use the DataSet extensions. Assume you have a new C# Console Application named LinqToDataSetApp. Add a reference to the latest and greatest version (3.0.0.0) of the AutoLotDAL.dll assembly and update your initial code file with the following logic: using System; using System.Data; // Location of strongly typed data containers. using AutoLotDAL; // Location of strongly typed data adapters. using AutoLotDAL.AutoLotDataSetTableAdapters; namespace LinqToDataSetApp { class Program { static void Main(string[] args) { Console.WriteLine("***** LINQ over DataSet *****\n"); // Get a strongly typed DataTable containing the current Inventory // of the AutoLot database.

AutoLotDataSet dal = new AutoLotDataSet(); InventoryTableAdapter da = new InventoryTableAdapter(); AutoLotDataSetInventoryDataTable data = daGetData(); // Invoke the methods that follow here! ConsoleReadLine(); } } } When you wish to transform an ADONET DataTable (including a strongly typed DataTable) into a LINQ-compatible object, you must call the AsEnumerable() extension method defined by the DataTableExtensions type This returns an EnumerableRowCollection object that contains a collection of DataRows You can then use the EnumerableRowCollection type to operate on each row using basic DataRow syntax (eg, indexer syntax) Consider the following new method of your Program class, which takes a strongly typed DataTable, obtains an enumerable copy of the data, and prints out each CarID value: static void PrintAllCarIDs(DataTable data) { // Get enumerable version of DataTable EnumerableRowCollection enumData = dataAsEnumerable(); // Print the car ID values foreach (DataRow r in enumData) Console.