Registry.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / Microsoft / Win32 / Registry.cs / 1 / Registry.cs
                        
                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
namespace Microsoft.Win32 {
 
 	using System; 
	using System.Runtime.InteropServices;
    using System.Runtime.Versioning; 

    /**
     * Registry encapsulation. Contains members representing all top level system
     * keys. 
     *
     * @security(checkClassLinking=on) 
     */ 
    //This class contains only static members and does not need to be serializable.
    [ComVisible(true)] 
    public static class Registry {
        /**
         * Current User Key.
         * 
         * This key should be used as the root for all user specific settings.
         */ 
        [ResourceExposure(ResourceScope.Machine)] 
        public static readonly RegistryKey CurrentUser        = RegistryKey.GetBaseKey(RegistryKey.HKEY_CURRENT_USER);
 
        /**
         * Local Machine Key.
         *
         * This key should be used as the root for all machine specific settings. 
         */
        [ResourceExposure(ResourceScope.Machine)] 
        public static readonly RegistryKey LocalMachine       = RegistryKey.GetBaseKey(RegistryKey.HKEY_LOCAL_MACHINE); 

        /** 
         * Classes Root Key.
         *
         * This is the root key of class information.
         */ 
        [ResourceExposure(ResourceScope.Machine)]
        public static readonly RegistryKey ClassesRoot        = RegistryKey.GetBaseKey(RegistryKey.HKEY_CLASSES_ROOT); 
 
        /**
         * Users Root Key. 
         *
         * This is the root of users.
         */
        [ResourceExposure(ResourceScope.Machine)] 
        public static readonly RegistryKey Users              = RegistryKey.GetBaseKey(RegistryKey.HKEY_USERS);
 
        /** 
         * Performance Root Key.
         * 
         * This is where dynamic performance data is stored on NT.
         * This does not exist on Win9X.
         */
        [ResourceExposure(ResourceScope.Machine)] 
        public static readonly RegistryKey PerformanceData    = RegistryKey.GetBaseKey(RegistryKey.HKEY_PERFORMANCE_DATA);
 
        /** 
         * Current Config Root Key.
         * 
         * This is where current configuration information is stored.
         */
        [ResourceExposure(ResourceScope.Machine)]
        public static readonly RegistryKey CurrentConfig      = RegistryKey.GetBaseKey(RegistryKey.HKEY_CURRENT_CONFIG); 

        /** 
         * Dynamic Data Root Key. 
         *
         * This is where dynamic performance data is stored on Win9X. 
         * This does not exist on NT.
         */
        [ResourceExposure(ResourceScope.Machine)]
        public static readonly RegistryKey DynData            = RegistryKey.GetBaseKey(RegistryKey.HKEY_DYN_DATA); 

        // 
        // Following function will parse a keyName and returns the basekey for it. 
        // It will also store the subkey name in the out parameter.
        // If the keyName is not valid, we will throw ArgumentException. 
        // The return value shouldn't be null.
        //
        private static RegistryKey GetBaseKeyFromKeyName(string keyName, out string subKeyName) {
            if( keyName == null) { 
                throw new ArgumentNullException("keyName");
            } 
 
            string basekeyName;
            int i = keyName.IndexOf('\\'); 
            if( i != -1) {
                basekeyName = keyName.Substring(0, i).ToUpper(System.Globalization.CultureInfo.InvariantCulture);
            }
            else { 
                basekeyName = keyName.ToUpper(System.Globalization.CultureInfo.InvariantCulture);
            } 
            RegistryKey basekey = null; 

            switch(basekeyName) { 
                case "HKEY_CURRENT_USER":
                    basekey = Registry.CurrentUser;
                    break;
                case "HKEY_LOCAL_MACHINE": 
                    basekey = Registry.LocalMachine;
                    break; 
                case "HKEY_CLASSES_ROOT": 
                    basekey = Registry.ClassesRoot;
                    break; 
                case "HKEY_USERS":
                    basekey = Registry.Users;
                    break;
                case "HKEY_PERFORMANCE_DATA": 
                    basekey = Registry.PerformanceData;
                    break; 
                case "HKEY_CURRENT_CONFIG": 
                    basekey = Registry.CurrentConfig;
                    break; 
                case "HKEY_DYN_DATA":
                    basekey = Registry.DynData;
                    break;
                default: 
                    throw new ArgumentException(Environment.GetResourceString("Arg_RegInvalidKeyName", "keyName"));
            } 
            if( i == -1 || i == keyName.Length) { 
                subKeyName = string.Empty;
            } 
            else {
                subKeyName = keyName.Substring(i + 1, keyName.Length - i - 1);
            }
            return basekey; 
        }
 
        [ResourceExposure(ResourceScope.Machine)] 
        [ResourceConsumption(ResourceScope.Machine)]
        public static object GetValue(string keyName, string valueName, object defaultValue ) { 
            string subKeyName;
            RegistryKey basekey = GetBaseKeyFromKeyName(keyName, out subKeyName);
            BCLDebug.Assert(basekey != null, "basekey can't be null.");
            RegistryKey key = basekey.OpenSubKey(subKeyName); 
            if(key == null) { // if the key doesn't exist, do nothing
                return null; 
            } 
            try {
                return key.GetValue(valueName, defaultValue); 
            }
            finally {
                key.Close();
            } 
        }
 
        [ResourceExposure(ResourceScope.Machine)] 
        [ResourceConsumption(ResourceScope.Machine)]
        public static void SetValue(string keyName, string valueName, object value ) { 
            SetValue(keyName, valueName, value, RegistryValueKind.Unknown);
        }

        [ResourceExposure(ResourceScope.Machine)] 
        [ResourceConsumption(ResourceScope.Machine)]
        public static void SetValue(string keyName, string valueName, object value, RegistryValueKind valueKind ) { 
            string subKeyName; 
            RegistryKey basekey = GetBaseKeyFromKeyName(keyName, out subKeyName);
            BCLDebug.Assert(basekey != null, "basekey can't be null!"); 
            RegistryKey key = basekey.CreateSubKey(subKeyName);
            BCLDebug.Assert(key != null, "An exception should be thrown if failed!");
            try {
                key.SetValue(valueName, value, valueKind); 
            }
            finally { 
                key.Close(); 
            }
        } 
    }
}
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Registry.cs source code in C# .NET

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