Is .NET Framework Installed

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Hi All,

I have a clickonce application published to an internal website. I want to have a landing page that allows the user to install the application. This is not a problem.

However, is there some Javascript I can run to determine if .NET 4 Full is installed? I want to disable the install button if it is not installed and show a link to it.

I can only find info on finding out whether 3.5 is installed and have had no success with 4.0

Thanks in advance!!

Posted 5-May-11 4:07am

Dave Kerr

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Solution 2

This is a way suggested by OriginalGriff:

A safe way to get the user to check if the .NET framework is installed[^].

Please, all credit goes to him!

—SA

Posted 5-May-11 13:06pm

Sergey Alexandrovich Kryukov

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Dylan Morley · Accepted Answer · 2011-05-05T04:28:00

You should be able to check the User Agent to determine what versions are installed, e.g. this script checks for version of the framework - you could modify for version 4.0

http://msdn.microsoft.com/en-us/library/ms749404.aspx[^]

My user agent in IE is

Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; .NET4.0C; .NET4.0E; InfoPath.2).

The agent you're interested in are

.NET4.0C .NET framework
Version : 4.0 Client Profile

.NET4.0E .NET framework
Version : 4.0 Extended

You'll get these in IE, but not definitely in all browsers....e.g

http://www.hanselman.com/blog/TheNETFrameworkAndTheBrowsersUserAgentString.aspx[^]