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static class MyExtensions { ... } static class TesterUtilClass { ... } static class CarExtensions { ... } } other namespaces in the project would need to explicitly import the MyExtensionMethods namespace to gain the extension methods defined by these types. Therefore, the following is a compiler error: // Here is our only using directive. using System; namespace MyNewApp { class JustATest { void SomeMethod() { // Error! Need to import MyExtensionMethods // namespace to extend int with Foo()! int i = 0; i.Foo(); } } }

The GetBytes() method returns a value that indicates the number of bytes retrieved. If you need to determine the total number of bytes in the field, you simply need to pass a null reference (Nothing) instead of a buffer when you call the GetBytes() method.

Given the fact that extension methods are not literally defined on the type being extended, it is certainly possible to become confused when examining an existing code base. For example, assume you have imported a namespace that defined some number of extension methods authored by a teammate. As you are authoring your code, you might create a variable of the extended type, apply the dot operator, and find dozens of new methods that are not members of the original class definition! Thankfully, Visual Studio s IntelliSense mechanism marks all extension methods with a unique, blue down-arrow icon (see Figure 12-5).

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The ReponseBinaryWrite() method creates a bit of a challenge if you want to integrate image data with other controls and HTML That s because when you use BinaryWrite() to return raw image data, you lose the ability to add any extra HTML content To attack this problem, you need to create another page that calls your image-generating code The best way to do this is to replace your image-generating page with a dedicated HTTP handler that generates image output This way, you save the overhead of the full ASP NET web form model, which you aren t using anyway ( 5 introduces HTTP handlers) Creating the HTTP handler you need is quite easy You simply need to implement the IHttpHandler interface and implement the ProcessRequest() method The HTTP handler will retrieve the ID of the record you want to display from the query string.

</network> <server> <max-cache-size> 1000 </max-cache-size> <message-time-to-live> 0 </message-time-to-live> <durable> true </durable> </server> </properties> </destination> </service> If you have configured everything correctly, you should be able to start the application by using the command mvn jetty:run.

Figure 12-5. The IntelliSense of extension methods Any method marked with this visual icon is a friendly reminder that the method is defined outside of the original class definition via an extension method.

Here s the complete HTTP handler code: Public Class ImageFromDB : Implements IHttpHandler Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandlerProcessRequest Dim connectionString As String = WebConfigurationManagerConnectionStrings("Pubs")ConnectionString ' Get the ID for this request Dim id As String = contextRequestQueryString("id") If id Is Nothing Then Throw New ApplicationException("Must specify ID") End If ' Create a parameterized command for this record Dim con As New SqlConnection(connectionString) Dim SQL As String = "SELECT logo FROM pub_info WHERE pub_id=@ID" Dim cmd As New SqlCommand(SQL, con) cmdParametersAddWithValue("@ID", id) Try conOpen() Dim r As SqlDataReader = cmdExecuteReader(CommandBehaviorSequentialAccess) If rRead() Then Dim bufferSize As Integer = 100 ' Size of the buffer Dim bytes As Byte() = New Byte(bufferSize - 1) {} ' The buffer Dim bytesRead As Long ' The # of bytes read.

The previous example extended the functionality of various types (such as the System.Int32 type) for use by the current console application. However, I am sure you can imagine the usefulness of building a.NET code library that defines extensions that can be referenced by multiple applications. As luck would have it, doing so is very straightforward. 14 will delve into the details of creating and configuring custom libraries; however, if you wish to follow along for this example, create a new Class Library project named MyExtensionsLibrary. Next, rename your initial C# code file to MyExtensions.cs and copy the MyExtensions class definition in your new namespace: namespace MyExtensionsLibrary { // Be sure to import System.Reflection. public static class MyExtensions { // Same implementation as before. public static void DisplayDefiningAssembly(this object obj) {...}

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