Private Assemblies in .NET

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Private assemblies are assemblies that are used solely by the Web application with which it has been deployed. Private assemblies are required to be located in the main folder as the Web application (bin), or a subdirectory of the Web application. In the example of the Web site that is using the DataComponent, setting the reference to the DataComponent copied the DataComponent assembly to the bin folder of the Web site. Deployment of Web applications that use private assemblies is simply a matter of copying the files to the new location, and creating a Web share, as was done in 2, Solutions, Projects, and the Visual Studio .NET IDE. The common language runtime probes for the DataComponent in the bin folder of the Web application. By default, there is no runtime version control on private assemblies. This means that different versions of the assembly simply can be copied into the bin folder of the Web site. Assuming that the assemblies are compatible, the ASP.NET starts using the new assembly.
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Private assemblies are considered to be the deployment model of choice by some people. Be careful, because although it is simple to deploy assemblies by simply copying the files to the destination, this could become unmanageable as an assembly is used with many applications. Shared Assemblies are covered in this chapter, which is a more manageable choice.
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When working with private assemblies, the common language runtime looks for the assembly in the same folder as the Web application, which is the bin folder. The common language runtime starts by looking for the assembly by its friendly name plus the .dll extension. If the file is not found, the common language runtime attempts to locate the assembly by using its friendly name plus the .exe extension.
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Look for .dll file first
No - Repeat tests, look for .exe file
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Checked for EXE In privatePath defined No Yes No TypeLoadException In private path dir(s)
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Figure 15.5 The probing sequence that the common language runtime uses when locating a private assembly that has no strong name.
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If the assembly is not found in the bin folder, the common language runtime checks for the existence of a folder that has the same name as the assembly s friendly name. If the folder exists, the common language runtime attempts to locate the assembly in that folder. It may be desirable to place all of the referenced assemblies in a common subdirectory. This can be done by placing a probing privatePath directive into the Web.config file as follows:
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<configuration> <runtime> <assemblyBinding xmlns= urn:schemas-microsoft-com:asm.v1 > <probing privatePath= bin\salesDll;bin\customerDll /> </assemblyBinding> </runtime> </configuration>
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This code sets a lookup path to the bin\salesDll and bin\customerDll folders. If the assembly is not found in the bin folder, the common language runtime looks in the privatePaths that are defined. Figure 15.5 shows the probing sequence that the common language runtime uses when attempting to locate a private assembly that has no strong name. Probing for assemblies is covered in more detail later in this chapter.
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Side-by-Side Versioning
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Copying over the assembly in one Web application does not affect private assemblies for other Web sites. This means that version 2.0.0.0 of the DataComponent assembly can be running in one Web site, and version 3.0.0.0 of the DataComponent assembly can be running in a different Web site on the same computer. Side-by-side versioning was impossible when using traditional COM components, because the Registry contained the location information for a COM component, and there was only one setting for any given COM component. With the .NET Framework, no Registry entries need to be made for the common language runtime to locate an assembly. This eliminates the problem that COM components had, whereby an older version of a .dll file was installed on a system and caused the newer programs that used a newer version of the .dll file to break. This was commonly referred to as DLL Hell.
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