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Checking for a 4.0 Framework Install

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How can I tell whether a machine has the 4.0 framework installed?

Checking for the presence of the installation registry value is still a straightforward way of doing this reliably. A slight complication is that in 4.0 there has been a split into the full and client framework profiles. Installing the full profile includes a copy of the client profile but the client profile might be used and updated independently. A limited subset of WCF is available in the client profile.

The registry keys for the client and full profiles are:

Software\Microsoft\NET Framework Setup\NDP\v4\Client

Software\Microsoft\NET Framework Setup\NDP\v4\Full

If the corresponding profile is installed, then these keys will contain a value named Install set to 1.

For the historically curious, here are the corresponding registry keys to check for older versions of the framework:

Software\\Microsoft\\.NETFramework\\Policy\\v1.0

Software\\Microsoft\\NET Framework Setup\\NDP\\v1.1.4322

Software\\Microsoft\\NET Framework Setup\\NDP\\v2.0.50727

Software\\Microsoft\\NET Framework Setup\\NDP\\v3.0

Software\\Microsoft\\NET Framework Setup\\NDP\\v3.5

The name and location of the installation registry value varies from version to version a bit. However, the same test as used for 4.0 does work for 1.1, 2.0, and 3.5.

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