Find match in subkey values

I'm having trouble with the following two items:

• How to retrieve all of the subkey values in ClassesRoot\Typelib, and;
• How to find a match for a known value (path/dll name) in the array of subkey values.

As background info, I'm trying to find a way to check if a DLL has been registered. Someone mentioned that checking ClassesRoot\Typelib for the DLL was one way of doing it, since I know the directory location and name of the DLL, but nothing else.

Does anyone have any tips? Cheers.

From stackoverflow

• Have a look at Microsoft.Win32.Registry and Microsoft.Win32.RegistryKey.

  public void Foo()
  {
     foreach (string s in Microsoft.Win32.Registry.CurrentUser.GetSubKeyNames())
     {
        Microsoft.Win32.RegistryKey rk = Microsoft.Win32.Registry.CurrentUser.OpenSubKey(s);
        // check here for the dll value and exit if found
        // recurse down the tree...
     }
  }
  

• I've not tested it extensively and it has very little error handling code, but this should help you start.

  public static bool IsRegistered(string name, string dllPath)
  {
      RegistryKey typeLibKey = Registry.ClassesRoot.OpenSubKey("TypeLib");
      foreach (string libIdKeyName in typeLibKey.GetSubKeyNames())
      {
          RegistryKey libIdKey = typeLibKey.OpenSubKey(libIdKeyName);
          foreach (string versionKeyName in libIdKey.GetSubKeyNames())
          {
              RegistryKey versionKey = libIdKey.OpenSubKey(versionKeyName);
              string regName = (string)versionKey.GetValue("");
              if (regName == name)
              {
                  foreach (string itterKeyName in versionKey.GetSubKeyNames())
                  {
                      int throwawayint;
                      if (int.TryParse(itterKeyName, out throwawayint))
                      {
                          RegistryKey itterKey = versionKey.OpenSubKey(itterKeyName);
                          string regDllPath = (string)itterKey.OpenSubKey("win32").GetValue("");
                          if (regDllPath == dllPath)
                          {
                              return true;
                          }
                      }
                  }
              }
          }
      }
  
      return false;
  }
  

  }