The answers are displayed on multiple websites. I have joined the code from these two links:
https://stackoverflow.com/questions/951856/is-there-an-easy-way-to-check-the-net-framework-version
https://www.c-sharpcorner.com/article/how-to-identify-which-net-framework-is-installed/
And got this solution:
public static List<string> GetList()
{
List<string> res = new List<string>();
RegistryKey installed_versions = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\NET Framework Setup\NDP");
string[] version_names = installed_versions.GetSubKeyNames();
foreach(string version in version_names)
{
if (version == "CDF") continue;
string tmp = "";
//version names start with 'v', eg, 'v3.5' which needs to be trimmed off before conversion
tmp += version.Replace("v", "");
int SP = Convert.ToInt32(installed_versions.OpenSubKey(version).GetValue("SP", 0));
if (SP > 0)
{
tmp += " SP" + SP;
}
res.Add(tmp);
}
using (RegistryKey ndpKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32).OpenSubKey("SOFTWARE\\Microsoft\\NET Framework Setup\\NDP\\v4\\Full\\"))
{
version_names = ndpKey.GetSubKeyNames();
int releaseKey = Convert.ToInt32(ndpKey.GetValue("Release"));
if (true)
{
res.Add(CheckFor45DotVersion(releaseKey));
}
}
return res;
}
private static string CheckFor45DotVersion(int releaseKey)
{
if (releaseKey >= 394802)
{
return "4.6.2 or later";
}
if (releaseKey >= 394254)
{
return "4.6.1 or later";
}
if (releaseKey >= 393273)
{
return "4.6 or later";
}
if ((releaseKey >= 379893))
{
return "4.5.2 or later";
}
if ((releaseKey >= 378675))
{
return "4.5.1 or later";
}
if ((releaseKey >= 378389))
{
return "4.5 or later";
}
// This line should never execute. A non-null release key should mean
// that 4.5 or later is installed.
return "No 4.5 or later version detected";
}
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