Csharp/C Sharp/Windows/Registry

Enumerating Registry Keys

<source lang="csharp"> using System; using Microsoft.Win32;

 class Class1
 {
   static void Main(string[] args)
   {
     RegistryKey myRegKey=Registry.LocalMachine;
     myRegKey=myRegKey.OpenSubKey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall");
     String [] subkeyNames = myRegKey.GetSubKeyNames();
     foreach (String s in subkeyNames) {
       RegistryKey UninstallKey=Registry.LocalMachine;
       UninstallKey=UninstallKey.OpenSubKey ("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\" + s);
       Object oValue=UninstallKey.GetValue("DisplayName");
       Console.WriteLine(oValue.ToString());
     }
   }
 }
          
      </source>

Get registry value from LocalMachine key

<source lang="csharp"> using System; using System.Windows.Forms; using Microsoft.Win32; public class FormSettingStore {

   public static void Main(){
       RegistryKey key = Registry.LocalMachine.CreateSubKey("KeyName");
       key.SetValue("Height", "100");
       key.SetValue("Width", "100");
       key.SetValue("Left", "100");
       key.SetValue("Top", "100");
       Console.WriteLine((int)key.GetValue("Height", "150"));
       Console.WriteLine((int)key.GetValue("Width",  "150"));
       Console.WriteLine((int)key.GetValue("Left",  "150"));
       Console.WriteLine((int)key.GetValue("Top",  "150"));
   }

}

      </source>

Read value from registry

<source lang="csharp">

 using System;
 using System.Drawing;
 using System.Collections;
 using System.Windows.Forms;
 using System.Resources;
 using Microsoft.Win32;
 // For event log.
 using System.Diagnostics;
 class Test
 {
   static void Main(string[] args)
   {
     // Save user prefs to reg.
     RegistryKey regKey = Registry.CurrentUser;
     regKey = regKey.CreateSubKey("Software\\Intertech\\YourKeyRes");
     regKey.SetValue("CurrSize", "29");
     regKey.SetValue("CurrColor", "Red");
     Console.WriteLine("Settings saved in registry");
     RegistryKey regKey1 = Registry.CurrentUser;
     regKey1 = regKey1.CreateSubKey("Software\\Intertech\\YourKeyRes");
     Console.WriteLine(regKey1.GetValue("CurrSize", "30"));
     Console.WriteLine(regKey1.GetValue("CurrColor", "Blue"));
   }
 }
  
          
      </source>

Retrieve the CPU Type and Speed from the Registry

<source lang="csharp"> using System; using Microsoft.Win32;

 class Class1
 {
   static void Main(string[] args)
   {
     RegistryKey RegKey = Registry.LocalMachine;
     RegKey = RegKey.OpenSubKey("HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0");
     Object cpuSpeed = RegKey.GetValue("~MHz");
     Object cpuType  = RegKey.GetValue("VendorIdentifier");
     Console.WriteLine("You have a {0} running at {1} MHz.",cpuType,cpuSpeed);
   }
 }
          
      </source>

Save value to registery

<source lang="csharp">

 using System;
 using System.Resources;
 using Microsoft.Win32;
 using System.Diagnostics;
 class Test
 {
   static void Main(string[] args)
   {
     // Save user prefs to reg.
     RegistryKey regKey = Registry.CurrentUser;
     regKey = regKey.CreateSubKey("Software\\Intertech\\YourKeyRes");
     regKey.SetValue("CurrSize", "29");
     regKey.SetValue("CurrColor", "Red");
     Console.WriteLine("Settings saved in registry");
   }
 }
  
          
      </source>

Write a Text and DWord Value to the Registry

<source lang="csharp"> using System; using Microsoft.Win32;

 class Class1
 {
   static void Main(string[] args)
   {
     RegistryKey RegKeyWrite = Registry.CurrentUser;
     RegKeyWrite = RegKeyWrite.CreateSubKey("Software\\CSHARP\\WriteRegistryValue");
     RegKeyWrite.SetValue("StringValue","TRUE");
     RegKeyWrite.SetValue("Number",100);
     RegKeyWrite.Close();
  
     RegistryKey RegKeyRead = Registry.CurrentUser;
     RegKeyRead = RegKeyRead.OpenSubKey  ("Software\\CSHARP\\WriteRegistryValue");
     Object regSuccessful = RegKeyRead.GetValue("StringValue");
     Object regAttemptNumber = RegKeyRead.GetValue("Number");
     RegKeyRead.Close();
  
     if ((string)regSuccessful == "TRUE")
       Console.WriteLine("Succeeded on attempt # {0}",regAttemptNumber);
     else
       Console.WriteLine("Failed!");
   }
 }
          
      </source>