Comment vérifier si une valeur de registre existe en C#?

Question

Comment vérifier si une valeur de registre existe par code C#? Ceci est mon code, je veux vérifier si 'Start' existe.

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

Pour la clé de Registre, vous pouvez vérifier si elle est nulle après l'avoir obtenu. Ce sera, s'il n'existe pas. Pour la valeur de registre, vous pouvez obtenir des noms de valeurs pour la clé actuelle et vérifier si ce tableau contient le nom de valeur requis.

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 
     }; 

utilisation

:

 // 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 "); 
        } 
       } 
      } 
     }