Write assembly cache
The first step involved in adding an assembly is to strong-name the assembly. Pitfalls[ edit ] The Global Assembly Cache mechanism helps to avoid older DLL hellbut it still has some drawbacks, such as:  By default, applications will only run with the version of the.
Because the global assembly cache is installed in the systemroot directory, it inherits that directory's ACL. Add the following code to your assembly to associate the strong name.
Global assembly cache download
NET Framework used to compile it, which can cause the application to fail on machines with newer versions of the. In addition, you do not have to install assemblies into the global assembly cache to make them accessible to COM interop or unmanaged code. But surely ASP. Where is the GAC Up until. The file extension can be anything, but. It is implemented and managed by the CLI. You can also use the gacutil. Requirements[ edit ] Assemblies residing in the GAC must adhere to a specific versioning scheme which allows for side-by-side execution of different code versions. If you NGEN without putting them in the Global Assembly Cache then you will actually slow things down because the CLR will need to perform verification of the assembly to ensure that it matches the native image. It is a common place in the OS where assemblies that are going to be shared between different applications can be stored. If the assembly is already installed, then return the name of the previously cached assembly.
Here's a great article on performance benefits of NGEN. Administrators often protect the systemroot directory using an Access Control List ACL to control write and execute access.
You can also use the gacutil.
Assembly already exists in cache. use /f option to force overwrite
Instead, the virtual file system of the GAC can be used by programs that need to use each version of the assembly specifically. Also, you must import the System. Since it is required that both be compiled to a file named AssemblyA, they cannot exist in the same directory within the FAT32 file system. If an attacker decided to poison an assembly, he would also have access to the location where the strong name would be stored and could easily change it to his strong name. It is implemented and managed by the CLI. It is recommended that only users with Administrator privileges be allowed to delete files from the global assembly cache. You might also consider trying to optimize the base addresses of the DLL's because if they're all using the default, then Windows needs to rebase 30, times! There are other ways to add an assembly to the GAC Windows offers a shell integration for.
There are also memory benefits to NGEN'd assemblies because they can share code pages. Where is the GAC Up until.
DLL used in multiple projects would have to load a separate copy of that DLL into memory for each appdomain, would they not? What you need to keep in mind is that such a reference requires the fully qualified assembly name in order to work.
There are other ways to add an assembly to the GAC Windows offers a shell integration for. For example, to create a strong name for an assembly named sample. NET Framework provides a central place for registering assemblies.
If you NGEN without putting them in the Global Assembly Cache then you will actually slow things down because the CLR will need to perform verification of the assembly to ensure that it matches the native image.
How to use gac assembly in c#
The global assembly cache stores assemblies specifically designated to be shared by several applications on the computer. Global Assembly Cache Tool[ edit ] gacutil. The common language runtime checks the global assembly cache for an assembly that matches the assembly request before probing or using the codebase information in a configuration file. The process of adding an assembly to the Global Assembly Cache can be compared to the process of registering COM components in the server, as is done in the case of Windows DNA applications. Add the following code to your assembly to associate the strong name. Obviously each appdomain needs its own state, but would the code itself be loaded twice? There are also memory benefits to NGEN'd assemblies because they can share code pages. You might also consider trying to optimize the base addresses of the DLL's because if they're all using the default, then Windows needs to rebase 30, times! Consider that any static members would be shared across AppDomains if the assemblies themselves were shared. Where is the GAC Up until. Note Assemblies placed in the global assembly cache must have the same assembly name and file name not including the file name extension. As a general guideline, keep assembly dependencies private and locate assemblies in the application directory unless sharing an assembly is explicitly required. Perhaps for a large number of applications that use the same assembly there may be a difference but confirming or refuting this claim is a long story that is not the point of this post. The method to retrieve an assembly takes the token and returns an object which encapsulates the cached assembly's information.
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