C#操作注册表(转)

http://www.cnblogs.com/whitetiger/archive/2008/04/09/1144219.html

1.读取指定名称的注册表的值
private string GetRegistData(string name)
{
   string registData;
   RegistryKey hkml = Registry.LocalMachine;
   RegistryKey software = hkml.OpenSubKey("SOFTWARE",true);
   RegistryKey aimdir = software.OpenSubKey("XXX",true);
   registData = aimdir.GetValue(name).ToString();
   return registData;
}
以上是读取的注册表中HKEY_LOCAL_MACHINE\SOFTWARE目录下的XXX目录中名称为name的注册表值；

2.向注册表中写数据
private void WTRegedit(string name,string tovalue)
{
   RegistryKey hklm = Registry.LocalMachine;
   RegistryKey software = hklm.OpenSubKey("SOFTWARE",true);
   RegistryKey aimdir = software.CreateSubKey("XXX");
   aimdir.SetValue(name,tovalue);
}
以上是在注册表中HKEY_LOCAL_MACHINE\SOFTWARE目录下新建XXX目录并在此目录下创建名称为name值为tovalue的注册表项；

3.删除注册表中指定的注册表项
private void DeleteRegist(string name)
{
   string[] aimnames;
   RegistryKey hkml = Registry.LocalMachine;
   RegistryKey software = hkml.OpenSubKey("SOFTWARE",true);
   RegistryKey aimdir = software.OpenSubKey("XXX",true);
   aimnames = aimdir.GetSubKeyNames();
   foreach(string aimKey in aimnames)
   {
    if(aimKey == name)
     aimdir.DeleteSubKeyTree(name);
   }
}
以上是在注册表中HKEY_LOCAL_MACHINE\SOFTWARE目录下XXX目录中删除名称为name注册表项；

4.判断指定注册表项是否存在
private bool IsRegeditExit(string name)
{
    bool _exit = false;
    try
    {
        string[] subkeyNames;
        RegistryKey hkml = Registry.LocalMachine;
        RegistryKey software = hkml.OpenSubKey("SOFTWARE", true);
        RegistryKey aimdir = software.OpenSubKey("Weather", true);
        subkeyNames = aimdir.GetValueNames();
        foreach (string keyName in subkeyNames)
        {
            if (keyName == name)
            {
                _exit = true;
                return _exit;
            }
        }
    }
    catch
    { }
    return _exit;
}
以上是在注册表中HKEY_LOCAL_MACHINE\SOFTWARE目录下XXX目录中判断名称为name注册表项是否存在，这一方法在删除注册表时已经存在，在新建一注册表项时也应有相应判断； 

一个例子：

using Microsoft.Win32;
using System.Diagnostics;
private void Access_Registry()
{
    // 在HKEY_LOCAL_MACHINE\Software下建立一新键，起名为MCBInc
    RegistryKey key = Registry.LocalMachine.OpenSubKey("Software", true);
    // 增加一个子键
    RegistryKey newkey = key.CreateSubKey("MCBInc");

    // 设置此子键的值
    newkey.SetValue("MCBInc", "NET Developer");
    
    // 从注册表的其他地方获取数据
    // 找出你的CPU
    RegistryKey pRegKey = Registry.LocalMachine;
    pRegKey = pRegKey.OpenSubKey("HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0");
    Object val = pRegKey.GetValue("VendorIdentifier");
    Debug.WriteLine("The central processor of this machine is:"+ val);
    // 删除键值
    RegistryKey delKey = Registry.LocalMachine.OpenSubKey("Software", true);
    delKey.DeleteSubKey("MCBInc");
}