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以下从‘读’‘写’‘删除’‘判断’四个事例实现对注册表的简单操作
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;
   string[] subkeyNames;
   RegistryKey hkml = Registry.LocalMachine;
   RegistryKey software = hkml.OpenSubKey("SOFTWARE",true);
   RegistryKey aimdir = software.OpenSubKey("XXX",true);
   subkeyNames = aimdir.GetSubKeyNames();
   foreach(string keyName in subkeyNames)
   {
    if(keyName == name)
    {
       _exit = true;
       return _exit;
    }
   }
   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；