检测计算机已经安装的NetFramework版本（摘录）

 1         ///
 2         /// 检测计算机已经安装的NetFramework版本
 3       ///
 4         internal void GetVersionFromRegistry()
 5         {
 6             using (RegistryKey ndpKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine,
 7                 RegistryView.Registry32).OpenSubKey(@"SOFTWAREMicrosoftNET Framework SetupNDP"))
 8             {
 9                 foreach (string versionKeyName in ndpKey.GetSubKeyNames())
10                 {
11                     if (versionKeyName.StartsWith("v"))
12                     {
13                         RegistryKey versionKey = ndpKey.OpenSubKey(versionKeyName);
14                         string name = (string)versionKey.GetValue("Version", "");
15                         string sp = versionKey.GetValue("SP", "").ToString();
16                         string install = versionKey.GetValue("Install", "").ToString();
17                         if (install == "") //no install info, ust be later
18                             Console.WriteLine(versionKeyName + "  " + name);
19                         else
20                         {
21                             if (sp != "" && install == "1")
22                             {
23                                 Console.WriteLine(versionKeyName + "  " + name + "  SP" + sp);
24                             }
25                         }
26                         if (name != "")
27                         {
28                             continue;
29                         }
30                         foreach (string subKeyName in versionKey.GetSubKeyNames())
31                         {
32                             RegistryKey subKey = versionKey.OpenSubKey(subKeyName);
33                             name = (string)subKey.GetValue("Version", "");
34                             if (name != "")
35                                 sp = subKey.GetValue("SP", "").ToString();
36                             install = subKey.GetValue("Install", "").ToString();
37                             if (install == "") //no install info, ust be later
38                                 Console.WriteLine(versionKeyName + "  " + name);
39                             else
40                             {
41                                 if (sp != "" && install == "1")
42                                 {
43                                     Console.WriteLine("  " + subKeyName + "  " + name + "  SP" + sp);
44                                 }
45                                 else if (install == "1")
46                                 {
47                                     Console.WriteLine("  " + subKeyName + "  " + name);
48                                 }
49                             }
50                         }
51                     }
52                 }
53             }
54         }

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原文地址：https://www.cnblogs.com/xiaoa/p/5359065.html