What is the purpose of bindingRedirect tag in web.config file of .NET?
The tag bindingRedirect
has its significance when multiple versions of an assembly persist in
GAC and you have to choose which version to actively use. Assume that
your application is using a DLL which is put up in GAC.
.NET gives you a provision to choose whichever version of DLL you want
to refer while executing your application. This customized behavior can
be achieved in .NET by specifying the bindingRedirect tag in web.config
file. This tag has two attributes namely new version and old version.
Whichever version is specified in the new version attribute will be binded
to your application at run time. Here is a snippet from web.config file
to give you an example of this tag:
In this snippet of web.config file, you have configured runtime configuration settings for an assembly named sampleAssembly. This assembly has two versions namely 188.8.131.52 and 184.108.40.206. From the version numbering, it is clear that 220.127.116.11 is the older version and 18.104.22.168 is the latest version. But you want 22.214.171.124 to be binded to the application and not the latest version. To achieve this, you introduce the bindingRedirect tag and specify the oldVersion attribute value to be the actual latest version namely 126.96.36.199 and specify the newVersion attribute value to 188.8.131.52 which is the first version of the assembly that is created.
At run time, CLR will look at the configuration settings and fetch the newVersion value of bindingRedirect tag and use 184.108.40.206 as the version to be refered in GAC while executing the application.
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