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The code can refer to a Web service as well as a WCF service. If it refers to a Web service, the Web service class is named Samples.Services.FinanceInfoService; if it refers to a WCF service, the namespace of the service contract might be Samples.Services and the name of the contract might be FinanceInfoService. The preceding code snippet invokes the method GetQuotes. In addition to the regular list of parameters for the service method, each proxy method can take up to three extra parameters. The first extra parameter is mandatory and represents the callback to invoke if the method execution is successful. The second and third optional parameters indicate, respectively, the callback to use in case of failure and a state object to pass to both callbacks. In the code snippet just shown, the onDataAvailable parameter refers to a JavaScript callback to call only if the method executes successfully. The signature of the success and failure callbacks is similar, but the internal format of the results parameter can change quite a bit. Here s the callback signature:

The advantage of using the latter method is that you can automate the installation pro cess for example, by running a batch or a script program. Even better, you can add a command to the Tools menu in Visual Studio .NET, by means of the External Tools command. The /i command overwrites any assembly in the GAC with the same identity, but doesn t remove copies of the same assembly with a different version number. (One of the goals of the GAC is to store multiple versions of the same assembly.) Each new ver sion that you install is added to the GAC, so you should periodically clear intermediate versions of the assembly from the GAC or run GACUTIL using the /u option to remove an outdated version of the assembly before installing a more recent one. You can list all the files in the GAC by means of the /l option. Adding an assembly to the GAC doesn t make your assembly visible in Visual Studio .NET s Add Reference dialog box. This dialog box never parses the GAC and just displays assemblies located in the following two directories: C:\WINDOWS\Microsoft.NET\Frame work\vx.y.zzzz (the main .NET Framework main directory) and C:\Program Files\Microsoft Visual Studio .NET 2003\Common7\IDE\PublicAssemblies. You might save your assemblies to the latter directory to make them quickly selectable from inside Visual Studio .NET.

function method(results, context, methodName)

13:

TABLE 20-9

Even better, you can add a new key under the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\AssemblyFolders registry key, name it MyAssem blies (or any name you like), and set the default value of this key equal to the directory that contains your assemblies (either private or shared). The next time you launch Visual Studio .NET you ll see all the assemblies in this directory in the list of selectable ones.

Indicates the return value from the method in the case of success. In the case of failure, a JavaScript Error object mimics the exception that occurred on the server during the execution of the method. The state object passed to the callback. The name of the service method that was invoked.

The top of the report looks like this:

The JavaScript proxy exposes a number of properties and methods for you to configure. The list is presented in Table 20-10.

When you re developing and debugging a shared assembly, this installing and unin stalling activity is surely a nuisance. Here s a simple trick to avoid it: create an environ ment variable named DEVPATH and assign it the name of the directory where you store your shared assemblies in debug mode, for example C:\SharedAssemblies. (Notice that the directory name can t contain spaces.) Next, add these lines to the machine.config file:

TABLE 20-10

<configuration> <runtime> <developmentMode developerInstallation="true"/> </runtime> </configuration>

Gets and sets the URL of the underlying Web or WCF service. Gets and sets the duration (in seconds) before the method call times out. Gets and sets the default JavaScript callback function to invoke for any successful call to a method. Gets and sets the default JavaScript callback function, if any, to invoke for a failed or timed-out call. Gets and sets the default JavaScript state object, if any, to be passed to success and failure callbacks.

You should use this setting only on your development system. The .NET Framework does no version checking on the assemblies in the directory pointed to by the DEV PATH variable, and just uses the first assembly with a given name. If no assembly with that name is found, the runtime searches the GAC. As interesting as it sounds, you rarely require this setting when you build your appli cation with Visual Studio .NET because projects under development can reference only DLLs with a specific path and never reference shared assemblies in the GAC.