If the requested assembly has also been requested in previous calls, the common language runtime uses the assembly that is already loaded. This can have ramifications when naming assemblies that make up an application. For more information about naming assemblies, see Assembly Names.
If a previous request for the assembly failed, subsequent requests for the assembly are failed immediately without attempting to load the assembly. Starting with the. NET Framework version 2. To revert to the behavior of the. NET Framework versions 1. For strong-named assemblies, the binding process continues by looking in the global assembly cache.
The global assembly cache stores assemblies that can be used by several applications on a computer. All assemblies in the global assembly cache must have strong names. After the correct assembly version has been determined by using the information in the calling assembly's reference and in the configuration files, and after it has checked in the global assembly cache only for strong-named assemblies , the common language runtime attempts to find the assembly.
The process of locating an assembly involves the following steps:. If a match is found, that assembly is used and no probing occurs. If the assembly is not found there, the binding request fails. The runtime then probes for the referenced assembly using the rules specified later in this section.
If it is a correct match, that assembly is used. If it is not a correct match, probing stops and binding fails. This codebase is always checked before the runtime attempts to probe for the referenced assembly.
If the runtime determines that an assembly matches the calling assembly's criteria, it uses that assembly. This location can be specified in the application configuration file and in managed code using the AppDomainSetup.
PrivateBinPath property for an application domain. When specified in managed code, the managed code privatePath is probed first, followed by the path specified in the application configuration file. The runtime always begins probing in the application's base, which can be either a URL or the application's root directory on a computer.
If the referenced assembly is not found in the application base and no culture information is provided, the runtime searches any subdirectories with the assembly name. The directories probed include:.
If culture information is specified for the referenced assembly, only the following directories are probed:. The directories specified using the privatePath attribute must be subdirectories of the application's root directory.
The directories probed vary depending on whether culture information is included in the referenced assembly request. The runtime stops probing the first time it finds an assembly that matches the simple assembly name referenced, whether it is a correct match or not. Assembly location can also be determined using the current binding context. This most often occurs when the Assembly.
Only terms with exact matches are highlighted in the search results. Net assembly in a store. Use this utility to modify the project settings within Visual Studio by including a Post Build Event as follows: ".. Use the Microsoft. NET Framework 4. This hash contains information such as references to all separate files that are referenced by the assembly, and references to other assemblies that are part of this assembly.
The hash is encrypted using public key cryptography. This will be covered more in Part 2 of this article series. The hash is used at runtime to verify that all related files and assemblies have not been modified since the assembly was compiled.
This helps prevent unwanted tampering. When the. This folder is known as the Assembly Cache. The cache contains a Private section as well as a Global section. The global cache is home to assemblies that are shared. I will cover "Shared Assemblies in Part 2. Specific restricted files for an application may reside in the private section. Files that your application downloads at runtime are also stored in the private section of the cache.
There are several utilities for working with assemblies and the cache area. These utilities are covered in the next series of articles Part 2 -- 3. Where k represents that we want to generate a key and the file name followed is the file in which the keys will be stored.
Before placing the assembly into shared cache you need to sign it using the keys we just generated. You mention the signing information in a special file called AssemblyInfo. Open the file from VS. NET solution explorer and change it to include following lines :. Microsoft has provided a utility called AL. Now, that we have understood the basics of assemblies let us apply our knowledge by developing a simple shared assembly.
In this example we will create a VB. We will also create a key file named sample. We will sign our component with this key file and place it in Global Assembly Cache. Note how the assembly folder is treated differently that normal folders. Click here to view the screen shot.
Now, we will create a sample client application which uses our shared assembly. Just create a sample code as listed below :. Now, copy the resulting EXE in any other folder and run it. It will display "Hello World" indicating that it is using our shared assembly.
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