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Every resource processed by ASP .NET is processed by an actor called an HTTP handler. For example, web pages with the extension .aspx are processed by a page handler, while web services with the extension .asmx are processed by a SOAP handler. All these classes are implementations of the IHttpHandler interface. When you associate your custom file type with the ASP.NET runtime, as shown in the previous section, you have to tell ASP .NET how to process this resource. The way to do this is to write a custom HTTP handler class that implements this interface. A custom handler processing any type of binary file looks like this: Namespace RolesDemo.Handlers Public Class GenericHandler Implements IHttpHandler Public ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable Get Return True End Get End Property

The last part of the *.edmx file is the <Designer> element, which is not used by the EF runtime. If you view this data, you will see it contains instructions used by Visual Studio to display your entities on the visual designer surface. Again, ensure that you have compiled your project at least once and click the Show All Files button of the Solution Explorer. Next, begin by drilling into the obj\Debug folder; and then drill into the edmxResourcesToEmbed subdirectory. Here you will find three XML files that are based on the entirety of your *.edmx file (see Figure 23-16).

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Hibernate implementation classes require access to the SessionFactory in order to work. The SessionFactory is a thread-safe and sharable object representing a single datasource. A SessionFactory requires a datasource and the mapping metadata. Spring provides a FactoryBean to simplify the configuration of a sharable SessionFactory. Figure 5-10 illustrates how the ORM works.

Figure 23-16. You use the *.edmx file to generate three seperate XML files The data in these files will be embedded as binary resources in your assembly. Thus, your .NET application has all the information it needs to understand the conceptual, physical, and mapping layers of the EDM.

Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest Dim ret As Byte() = Nothing ' Open the file specified in the context Dim PhysicalPath As String = context.Server.MapPath(context.Request.Path) Using fs As New FileStream(PhysicalPath, FileMode.Open) ret = New Byte(fs.Length - 1) {} fs.Read(ret, 0, CInt(fs.Length)) End Using ' If it is not Nothing, return the byte array If ret IsNot Nothing Then context.Response.BinaryWrite(ret) End If End Sub End Class End Namespace This handler simply determines the local physical path of the resource requested by calling Server.MapPath. Afterward it uses a FileStream for opening the resource and returning the bytes included for this resource. You have to configure this HTTP handler as well. For this purpose, you just add a <httpHandlers> section within the <system.web> section of your web.config application configuration, as follows: <httpHandlers> <add verb="GET,POST" path="*.txt" type="RolesDemo.Handlers.GenericHandler"/> </httpHandlers> The type attribute includes the full namespace and class name of the IHttpHandler implementation, and optionally if it is placed in a different assembly, you have to specify the name of the assembly in the format namespace.typename, assembly within it. The additional attributes specify the HTTP verb (GET, PUT, POST, or * for all) as well as the path and file types for which the handler will be used.

You are almost ready to author some code to use your EDM; before you do, however, you should check out the generated C# code base. Open the Class View window and expand your default namespace. You will see that, in addition to the Program class, the EDM Wizard generated an entity class (which you renamed to Car) and another class named AutoLotEntities. If you go to the Solution Explorer and expand the InventoryEDM.edmx node, you will see an IDEmaintained file named InventoryEDM.Designer.cs. As with any IDE-maintained file, you should not directly edit this file because the IDE will recreate it each time you compile. However, you can open this file for viewing by double-clicking it. The AutoLotEntities class extends the ObjectContext class, which (as you probably recall) is your entry point to the EF programming model. The constructors of AutoLotEntities provide various ways for you to feed in connection string data. The default constructor has been configured to read the connection string data automatically from the wizard-generated App.config file: public partial class AutoLotEntities : ObjectContext { public AutoLotEntities() : base("name=AutoLotEntities", "AutoLotEntities") {

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