Determining the path to the .NET framework

[andreas.baus]

Is there a canonical way to determine the path to the folder where the
runtime environment is installed? The reason I am asking is that I have
created a small Office Add-In in C# which needs to be registered as a
COM component using regasm.exe during installation. So I need a way for
the install script (the Add-In is only a part of a larger project which
does not use the default Microsoft installer) to find the regasm, since
it is not in the path by default.

 

[Marcus Heege]

System.Runtime.InteropServices.RuntimeEnvironment.GetRuntimeDirectory()

 

[andreas.baus]

Unfortunately that won't work in the scripting language of the setup
utility, unless I can write a small .NET executable to call during the
installation process which returns the result of the call to me. I was
hoping there was a way to get this value from the registry, for example.

 

[Marcus Heege]

I don't know of an officially documented one, but

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework

has a value named InstallRoot that gives you the framework's root directory
(without the version number).

Usually this value is "C:\WINDOWS\Microsoft.NET\Framework\"

This seems to be consistent with v1.1 and v2.0, however, you still need the
version dependent part of the path.

On my v2.0 VPC, there is a subkey with the v2 version number, however this
is not consistent with v1.1.

HTH