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Listing 2.7 Configuration file layout
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<configuration> <startup> ... </startup> <runtime> ... </runtime> ... </configuration>
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PRIVATE VS. SHARED ASSEMBLIES
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The file is divided into sections nested inside <configuration> tags. These sections include startup data, configuration data for the run time and for remoting services, security settings, and more. You can also use the application configuration file to record application settings similar to the way you might have used an INI file in the past. We ll look at several examples of configuration files as we explore different .NET subsystems throughout the book. For now, we re interested in specifying versioning policy for our people.exe application. We do this by creating the people.exe.config file shown in listing 2.8, and saving it to the application directory.
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Listing 2.8 Configuring the People.Exe application
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<configuration> <startup> <requiredRuntime safeMode="true"/> </startup> <runtime> <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"> <dependentAssembly> <assemblyIdentity name="person" publicKeyToken="08515fdfd3860a0b" culture=""/> <bindingRedirect oldVersion="1.0.0.0" newVersion="2.0.0.0"/> </dependentAssembly> </assemblyBinding> </runtime> </configuration>
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In the <startup> section, the <requiredRuntime safeMode="true"> causes the runtime startup code to search the registry to determine the runtime version. This is not necessary here and is included to illustrate that the CLR itself is versioned. Where multiple versions of the CLR are installed, you can specify the version used to run the application, as follows:
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<requiredRuntime version="v1.0.2901"/>
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The value specified should be identical to the name of the subdirectory where the corresponding version of the run time is installed. (In this case, version 1.0.2901.0 can be found at C:\WINNT\Microsoft.NET\Framework\v1.0.2901.) In the <runtime> section, we can specify assembly binding information. In this example, we specify that the application is dependent on the Person assembly and we use the <assemblyIdentity> tag to provide the name and public key token of the assembly. (The latter can be found by browsing the assembly cache, seen in figure 2.10.) We could specify culture information here if we had different assemblies for different cultures. For our purposes, the most important item is the binding redirect information:
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UNDERSTANDING TYPES AND ASSEMBLIES
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<bindingRedirect oldVersion="1.0.0.0" newVersion="2.0.0.0"/>
This tells the runtime to redirect references to version 1.0.0.0 of the Person assembly to the newer 2.0.0.0 version. Saving the configuration file and executing the people.exe application causes the application to run with the newer version, as shown in figure 2.12.
Using version 2.0.0.0 of the Person assembly
.NET s facility to allow multiple versions of shared assemblies to coexist is a major feature of the platform and goes a long way toward solving the dll hell of the past. Using appropriate configuration file entries, an application, which has been broken by the installation of a new version of a shared dependent assembly, can be restored to health. However, remember that private assemblies are the default under .NET. They are not installed in the global assembly cache and are not subject to versioning by the runtime. Instead, it is the responsibility of the application to deploy the correct versions of assemblies to its own private directory tree. Installing a shared versioned assembly is recommended only if the assembly is to be shared across multiple applications.
DOWNLOADING ASSEMBLIES
The potential to deliver software as a service, instead of shipping it in a shrinkwrapped box, has become a reality with the widespread adoption of the Internet and, in particular, the Web. There are several different potential models. For example, there are the browser-hosted applications including popular, Web-based email and shopping services. These applications are server-based and simply transport the user interface to the user in the form of a Web page. We explore the development of such applications in chapter 8 when we look at ASP.NET and the Web Forms programming model. Alternative models include using .NET s remoting or XML Web services classes, which facilitate the development of applications that can call, or expose, remote objects across the network or across the Web. This approach enables applications to aggregate remote services into a meaningful whole, effectively leveraging the Internet as a huge runtime library. We look at remoting in chapter 5 and XML Web services in chapter 6. .NET also supports the downloading of assemblies at run time enabling an application to incrementally install features as required. This approach could be used to
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