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The data examples in this chapter retrieve text, numeric, and date information. However, databases often have the additional challenge of storing binary data such as pictures. For example, you might have a Products table that contains pictures of each item in a binary field. Retrieving this data in an ASP .NET web page is fairly easy, but displaying it is not as simple. The basic problem is that in order to show an image in an HTML page, you need to add an image tag that links to a separate image file through the src attribute. Here s an example: <img src="myfile.gif" /> Unfortunately, this isn t much help if you need to show image data dynamically. Although you can set the src attribute in code, you have no way to set the image content programmatically. You could first save the data to an image file on the web server s hard drive, but that approach would be dramatically slower, waste space, and raise the possibility of concurrency errors if multiple requests are being served at the same time and they are all trying to write the same file. You can solve this problem in two ways. One approach is to store all your images in separate files. Then your database record simply needs to store the filename, and you can bind the filename to a server-side image. This is a perfectly reasonable solution, but it doesn t help in situations where you want to store images in the database so you can take advantage of the abilities of the RDBMS to cache data, log usage, and back up everything.

Create a new Console Application named ExtensionMethods. Now, assume you are authoring a utility class named MyExtensions that defines two extension methods. The first method allows any object in the .NET base class libraries to have a brand-new method named DisplayDefiningAssembly() that makes use of types in the System.Reflection namespace to display the assembly of the specified type.

In these situations, the solution is to use a separate ASP.NET resource that returns the binary data directly. You can then use this binary data in other web pages in controls. To tackle this task, you also need to step outside the data binding and write custom ADO.NET code. The following sections will develop the solution you need piece by piece.

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Note You will formally examine the reflection API in 15. If you are new to the topic, simply understand that reflection allows you to discover the structure of assemblies, types, and type members at runtime.

The second extension method, named ReverseDigits(), allows any System.Int32 to obtain a new version of itself where the value is reversed digit by digit. For example, if an integer with the value 1234 called ReverseDigits(), the integer returned is set to the value 4321. Consider the following class implementation (be sure to import the System.Reflection namespace if you are following along): static class MyExtensions {

As a general rule of thumb, storing images in a database works well as long as the images are not enormous (for example, more than 50 MB) and do not need to be frequently edited by other applications.

// This method allows any object to display the assembly // it is defined in. public static void DisplayDefiningAssembly(this object obj) { Console.WriteLine("{0} lives here: => {1}\n", obj.GetType().Name, Assembly.GetAssembly(obj.GetType()).GetName().Name); } // This method allows any integer to reverse its digits. // For example, 56 would return 65. public static int ReverseDigits(this int i) { // Translate int into a string, and then // get all the characters. char[] digits = i.ToString().ToCharArray(); // Now reverse items in the array. Array.Reverse(digits); // Put back into string. string newDigits = new string(digits); // Finally, return the modified string back as an int. return int.Parse(newDigits); } } Again, note how the first parameter of each extension method has been qualified with the this keyword, before defining the parameter type. It is always the case that the first parameter of an extension method represents the type being extended. Given that DisplayDefiningAssembly() has been prototyped to extend System.Object, any type in any assembly now has this new member. However, ReverseDigits() has been prototyped to only extend integer types, and therefore if anything other than an integer attempts to invoke this method, you will receive a compile-time error. Understand that a given extension method can have multiple parameters, but only the first parameter can be qualified with this. For example, here is an overloaded extension method defined in another utility class named TesterUtilClass: static class TesterUtilClass { // Every Int32 now has a Foo() method... public static void Foo(this int i) { Console.WriteLine("{0} called the Foo() method.", i); } // ...which has been overloaded to take a string! public static void Foo(this int i, string msg) { Console.WriteLine("{0} called Foo() and told me: {1}", i, msg); } }

The last step is to add a destination to configure the flex-messages.xml defining the default channel referring to the channel-polling-amf and adding a destination that will be shared by the AS Producer and Consumer objects. Below the full listing for the flex-messages.xml file: < xml version="1.0" encoding="UTF-8" > <service id="message-service-apt" class="flex.messaging.services.MessageService">

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