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Now rebuild and run the solution. You will not get any compiler errors, but when the test executes, the test fails. That s because you are simply returning a null value for the user. Let s fix that first. Start by modifying the UserData.cs file as shown in Listing 13-4. Listing 13-4. Modified UserData.cs File #region Using directives using System; using System.Collections.Generic; using System.Text; using BusinessLayer; #endregion namespace DataLayer { public class UserData { public UserData() { }

Receive() You always receive messages asynchronously, so that you do not block a thread while waiting for a message You post messages to the class using its posted method: mailboxPost(Add(name, sw)) You use a union type to define the messages that you can send and receive In this case, you define four operations, which are Add, Remove, SendMessage, and ClientExists: type ClientTableCommands = | Add of (string * StreamWriter) | Remove of string | SendMessage of string | ClientExists of (string * AsyncReplyChannel<bool>) These operations are implemented by pattern matching over the received message within the asynchronous workflow that receives the message Typically, you use an infinite recursive loop to read messages continuously In this example, the function is called loop.

There are a variety of ways to store an image on your hard drive Over the years, many formats for image files have been developed, each with pros and cons Fortunately a small number have emerged as being the most useful, two in particular: JPEG and PNG Both are well supported in image-editing software and you will probably not have to use other formats for storing images in a game JPEG (Joint Photographic Expert Group) JPEG image files typically have the extension jpg or sometimes jpeg If you use a digital camera, the files it produces will probably be JPEGs, because they were specifically designed for storing photographs They use a process known as lossy compression, which is very good at shrinking the file size.

public User GetUser(string username, string password) { User user = null; user = new User(); return user; } } } Notice that you just wrote a test, coded a little, and then refactored. This is the coding habit you want to develop. Once you have adopted this style of coding, you will find that you will produce fewer bugs and have a greater sense that the quality of the code you are creating is continually getting better. Now when you rebuild the solution, it builds just fine and your test passes, but nothing of any significance is really happening. To take the next step, you need to modify your UserData class to connect to the Northwind database to get the user s role, along with the username and password, using the username and password passed to the UserData class from the UserTests class. Listing 13-5 shows the UserData.cs file with these changes. Listing 13-5. UserData.cs File Modified to Connect to the Database #region Using directives using System; using System.Collections.Generic; using System.Data; using System.Data.Odbc; using System.Text; using BusinessLayer; #endregion namespace DataLayer { public class UserData { private static string connectionString = "Driver={Microsoft Access Driver (*.mdb)};" + "DBQ=c:\\xpnet\\database\\Northwind.mdb"; public UserData() { } public User GetUser(string username, string password) { User user = null;

The loop has a parameter of F# s immutable Map class, which provides the mapping between the client name, a string, and the connection to the client, which is represented by a StreamWriter: let rec loop (nameMap: Map<string, StreamWriter>) = .. This provides an elegant way to share state between the operations The operations update the map, and then pass the new instance on to the next iteration The operations Add and Remove are straightforward to implement; a new updated version of the map is created and passed forward to the next iteration of the loop This example shows only the Add operation because the Remove operation is so similar:.