C#对注册表的操作

一、引入命名空间：

using Microsoft.Win32;

二、创建注册表项：CreateSubKey（name）方法

添加SubKey时候首先要打开一个表项，并设置参数为true，才能成功创建子项

//给要创建的注册表设置一个变量，使用更方便
private string RegistFileName = "test";

/// <summary>
/// 创建一个test注册表项,下面包含OpenLog，和SaveLog两个子项
/// </summary>
private void CreateRegistFile()
{
　　//SOFTWARE在LocalMachine分支下
    RegistryKey key = Registry.LocalMachine.OpenSubKey("SOFTWARE",true);
    RegistryKey software = key.CreateSubKey(RegistFileName);
    RegistryKey test = key.OpenSubKey(RegistFileName,true);
    RegistryKey Savekey = test.CreateSubKey("SaveLog");
}

三、删除注册表项：DeleteSubKey（name，true）方法

RegistryKey key = Registry.LocalMachine;
RegistryKey software = key.OpenSubKey("SOFTWARE", true);
RegistryKey test = software.OpenSubKey(RegistFileName, true);
test.DeleteSubKey("SaveLog",true); 

四、添加键值：SetValue（name,value）方法

/// <summary>
/// 将path写入OPenLog子项
/// </summary>
private void writeToRegistFile(string path)
{
　　RegistryKey key = Registry.LocalMachine;
　　RegistryKey software = key.OpenSubKey("SOFTWARE", true);
　　RegistryKey test = software.OpenSubKey(RegistFileName, true);
　　RegistryKey OpenPath = test.OpenSubKey("OpenLog",true);
　　//"name"是该键值的name，相当于一个别名，可自行设置
　　OpenPath.SetValue("name", path);
}

五、删除键值：DeleteValue（name）方法

RegistryKey key = Registry.LocalMachine;
RegistryKey software = key.OpenSubKey("SOFTWARE", true);
RegistryKey test = software.OpenSubKey(RegistFileName, true);
RegistryKey OpenPath = test.OpenSubKey("SaveLog",true);
//删除SaveLog子项下的名为SaveLog的子键
OpenPath.DeleteValue("name");

六、判断注册表项是否存在：

/// <summary>
/// 判断注册表项是否存在
/// </summary>
/// <returns>bool</returns>
private bool IsRegeditItemExist()
{
　　string[] subkeyNames;
　　RegistryKey key = Registry.LocalMachine;
　　RegistryKey software = key.OpenSubKey("SOFTWARE");
　　subkeyNames = software.GetSubKeyNames();
　　//在这里我是判断test表项是否存在
　　foreach (string keyName in subkeyNames)
　　{
　　　　if (keyName == RegistFileName)
　　　　{
　　　　　　key.Close();
　　　　　　return true;
　　　　}
　　}
　　key.Close();
　　return false;
}

七、判断键值是否存在：

/// <summary>
/// 判断该路径是否已经存在
/// </summary>
/// <param name="path">路径</param>
/// <returns></returns>
private bool IsRegeditKeyExit(string name)
{string[] saveSubkeyNames;

    RegistryKey key = Registry.LocalMachine;
    RegistryKey software = key.OpenSubKey("SOFTWARE", true);
    RegistryKey test = software.OpenSubKey(RegistFileName, true);
    RegistryKey Savekey = test.OpenSubKey("SaveLog", true);

　　//获取该子项下的所有键值的名称saveSubkeyNames 
    saveSubkeyNames = Savekey.GetSubKeyNames();
foreach(string keyName in openSubkeyNames)
    {
        if(keyName == name)
        {
            key.Close();
            return false;
        }
    }
    key.Close();
    return true;
}