Detect framework version at application runtime

Question

How I could detect at application runtime

what version numbers of .NET framework are installed on the client machine?

possible duplicate of How to detect what .NET Framework versions and service packs are installed? — Steve
– Steve, Commented Nov 25, 2013 at 21:47

rory.ap · Accepted Answer · 2013-11-25 21:49:04Z

4

Environment.Version.ToString()

answered Nov 25, 2013 at 21:49

rory.ap

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3 Comments

Bassam Alugili Over a year ago

This will write the current version of the common language runtime. If he build the application with 2.0 what will he get?

Bassam Alugili Over a year ago

Correct your answer correct he want the application run-time and not which .net version are installed +1 from me

pitoloko Over a year ago

This is usefull to know the current application environment but ofcourse is unable to detectd which are installed on the machine. @User3805967 to clarifi: with 2.0 it should get fw2.0, with 3.0 and 3.5 it should get fw 3.0, and targetting the app to 4.0 and/or 4.5 It will get fw4.0, you answer was adapted to my requeriments and worked nice, I were just trying to accept your answer but you have deleted it, thank you two

Bassam Alugili · Accepted Answer · 2013-11-25 21:49:24Z

private static void GetVersionFromRegistry()
{
    using (RegistryKey ndpKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine,
        RegistryView.Registry32).OpenSubKey(@"SOFTWARE\Microsoft\NET Framework Setup\NDP\"))
    {
        foreach (string versionKeyName in ndpKey.GetSubKeyNames())
        {
            if (versionKeyName.StartsWith("v"))
            {

                RegistryKey versionKey = ndpKey.OpenSubKey(versionKeyName);
                string name = (string)versionKey.GetValue("Version", "");
                string sp = versionKey.GetValue("SP", "").ToString();
                string install = versionKey.GetValue("Install", "").ToString();
                if (install == "") //no install info, ust be later
                    Console.WriteLine(versionKeyName + "  " + name);
                else
                {
                    if (sp != "" && install == "1")
                    {
                        Console.WriteLine(versionKeyName + "  " + name + "  SP" + sp);
                    }

                }
                if (name != "")
                {
                    continue;
                }
                foreach (string subKeyName in versionKey.GetSubKeyNames())
                {
                    RegistryKey subKey = versionKey.OpenSubKey(subKeyName);
                    name = (string)subKey.GetValue("Version", "");
                    if (name != "")
                        sp = subKey.GetValue("SP", "").ToString();
                    install = subKey.GetValue("Install", "").ToString();
                    if (install == "") //no install info, ust be later
                        Console.WriteLine(versionKeyName + "  " + name);
                    else
                    {
                        if (sp != "" && install == "1")
                        {
                            Console.WriteLine("  " + subKeyName + "  " + name + "  SP" + sp);
                        }
                        else if (install == "1")
                        {
                            Console.WriteLine("  " + subKeyName + "  " + name);
                        }

                    }

                }

            }
        }
    }
}

resources info : http://msdn.microsoft.com/en-us/library/hh925568%28v=vs.110%29.aspx

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