¿Cómo verificar si existe un valor de registro usando C#?

Question

¿Cómo comprobar si existe un valor de registro mediante el código C#? Este es mi código, quiero verificar si existe 'Inicio'.

public static bool checkMachineType() 
{ 
    RegistryKey winLogonKey = Registry.LocalMachine.OpenSubKey(@"System\CurrentControlSet\services\pcmcia", true); 
    string currentKey= winLogonKey.GetValue("Start").ToString(); 

    if (currentKey == "0") 
     return (false); 
    return (true); 
} 

Answer 1

Para la clave del registro puede comprobar si es nula después de recibirla. Será, si no existe.

Para el valor del registro puede obtener los nombres de los valores para la clave actual y comprobar si esta matriz contiene el nombre del valor necesario.

Answer 2

string keyName=@"HKEY_LOCAL_MACHINE\System\CurrentControlSet\services\pcmcia"; 
string valueName="Start"; 
if (Registry.GetValue(keyName, valueName, null) == null) 
{ 
    //code if key Not Exist 
} 
else 
{ 
    //code if key Exist 
} 

Answer 3

public static bool registryValueExists(string hive_HKLM_or_HKCU, string registryRoot, string valueName) 
{ 
    RegistryKey root; 
    switch (hive_HKLM_or_HKCU.ToUpper()) 
    { 
     case "HKLM": 
      root = Registry.LocalMachine.OpenSubKey(registryRoot, false); 
      break; 
     case "HKCU": 
      root = Registry.CurrentUser.OpenSubKey(registryRoot, false); 
      break; 
     default: 
      throw new System.InvalidOperationException("parameter registryRoot must be either \"HKLM\" or \"HKCU\""); 
    } 

    return root.GetValue(valueName) != null; 
} 

Answer 4

RegistryKey rkSubKey = Registry.CurrentUser.OpenSubKey(" Your Registry Key Location", false); 
     if (rkSubKey == null) 
     { 
      // It doesn't exist 
     } 
     else 
     { 
      // It exists and do something if you want to 
     } 

Answer 5

 internal static Func<string, string, bool> regKey = delegate (string KeyLocation, string Value) 
     { 
      // get registry key with Microsoft.Win32.Registrys 
      RegistryKey rk = (RegistryKey)Registry.GetValue(KeyLocation, Value, null); // KeyLocation and Value variables from method, null object because no default value is present. Must be casted to RegistryKey because method returns object. 
      if ((rk) == null) // if the RegistryKey is null which means it does not exist 
      { 
       // the key does not exist 
       return false; // return false because it does not exist 
      } 
      // the registry key does exist 
      return true; // return true because it does exist 
     }; 

uso:

 // usage: 
     /* Create Key - while (loading) 
     { 
      RegistryKey k; 
      k = Registry.CurrentUser.CreateSubKey("stuff"); 
      k.SetValue("value", "value"); 
      Thread.Sleep(int.MaxValue); 
     }; // no need to k.close because exiting control */ 


     if (regKey(@"HKEY_CURRENT_USER\stuff ... ", "value")) 
     { 
      // key exists 
      return; 
     } 
     // key does not exist 

Answer 6

 RegistryKey test9999 = Registry.CurrentUser; 

     foreach (var item in test9999.GetSubKeyNames()) 
     { 
      if (item.ToString() == "SOFTWARE") 
      { 
       test9999.OpenSubKey(item); 

       foreach (var val in test9999.OpenSubKey(item).GetSubKeyNames()) 
       { 
        if(val.ToString() == "Adobe") { 
         Console.WriteLine(val+ " found it "); 
        } 
       } 
      } 
     }