C# 操作注册表

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");

     }