检测计算机已经安装的NetFramework版本（摘录）

　　　

         ///
         /// 检测计算机已经安装的NetFramework版本
       ///
         internal 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 == "")
                             {
                                 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 == "")
                                 {
                                     Console.WriteLine("  " + subKeyName + "  " + name + "  SP" + sp);
                                 }
                                 else if (install == "")
                                 {
                                     Console.WriteLine("  " + subKeyName + "  " + name);
                                 }
                             }
                         }
                     }
                 }
             }
         }