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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
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.
internal static class Registry {
static Registry()
{
}
/**
* Current User Key.
*
* This key should be used as the root for all user specific settings.
*/
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.
*/
public static readonly RegistryKey LocalMachine = RegistryKey.GetBaseKey(RegistryKey.HKEY_LOCAL_MACHINE);
/**
* Classes Root Key.
*
* This is the root key of class information.
*/
public static readonly RegistryKey ClassesRoot = RegistryKey.GetBaseKey(RegistryKey.HKEY_CLASSES_ROOT);
/**
* Users Root Key.
*
* This is the root of users.
*/
public static readonly RegistryKey Users = RegistryKey.GetBaseKey(RegistryKey.HKEY_USERS);
/**
* Performance Root Key.
*
* This is where dynamic performance data is stored on NT.
*/
public static readonly RegistryKey PerformanceData = RegistryKey.GetBaseKey(RegistryKey.HKEY_PERFORMANCE_DATA);
/**
* Current Config Root Key.
*
* This is where current configuration information is stored.
*/
public static readonly RegistryKey CurrentConfig = RegistryKey.GetBaseKey(RegistryKey.HKEY_CURRENT_CONFIG);
//
// 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(nameof(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;
default:
throw new ArgumentException(Environment.GetResourceString("Arg_RegInvalidKeyName", nameof(keyName)));
}
if( i == -1 || i == keyName.Length) {
subKeyName = string.Empty;
}
else {
subKeyName = keyName.Substring(i + 1, keyName.Length - i - 1);
}
return basekey;
}
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();
}
}
}
}
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