C# 环境变量设置

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using Microsoft.Win32; using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks;   namespace ZB.QueueSys.Common {     public class SysEnvironment     {         /// <summary>         /// 获取系统环境变量         /// </summary>         /// <param name="name"></param>         /// <returns></returns>         public static string GetSysEnvironmentByName(string name)         {             string result = string.Empty;             try             {                 result = OpenSysEnvironment().GetValue(name).ToString();//读取             }             catch { return string.Empty; }             return result;         }           /// <summary>         /// 打开系统环境变量注册表         /// </summary>         /// <returns>RegistryKey</returns>         private static RegistryKey OpenSysEnvironment()         {             RegistryKey regLocalMachine = Registry.LocalMachine;             RegistryKey regSYSTEM = regLocalMachine.OpenSubKey("SYSTEM", true);//打开HKEY_LOCAL_MACHINE下的SYSTEM             RegistryKey regControlSet001 = regSYSTEM.OpenSubKey("ControlSet001", true);//打开ControlSet001             RegistryKey regControl = regControlSet001.OpenSubKey("Control", true);//打开Control             RegistryKey regManager = regControl.OpenSubKey("Session Manager", true);//打开Control               RegistryKey regEnvironment = regManager.OpenSubKey("Environment", true);             return regEnvironment;         }           /// <summary>         /// 设置系统环境变量         /// </summary>         /// <param name="name">变量名</param>         /// <param name="strValue">值</param>         public static void SetSysEnvironment(string name, string strValue)         {             try             {                 OpenSysEnvironment().SetValue(name, strValue);             }             catch { return; }         }           /// <summary>         /// 检测系统环境变量是否存在         /// </summary>         /// <param name="name"></param>         /// <returns></returns>         public bool CheckSysEnvironmentExist(string name)         {             if (!string.IsNullOrEmpty(GetSysEnvironmentByName(name))) return true;             else return false;         }           /// <summary>         /// 添加到PATH环境变量（会检测路径是否存在，存在就不重复）         /// </summary>         /// <param name="strPath"></param>         public static void SetPathAfter(string strHome)         {             string pathlist = GetSysEnvironmentByName("PATH");             //检测是否以;结尾             if (pathlist.Substring(pathlist.Length - 1, 1) != ";")             {                 SetSysEnvironment("PATH", pathlist + ";");                 pathlist = GetSysEnvironmentByName("PATH");             }             string[] list = pathlist.Split(';');             bool isPathExist = false;               foreach (string item in list)             {                 if (item == strHome) isPathExist = true;             }               if (!isPathExist) SetSysEnvironment("PATH", pathlist + strHome + ";");         }           public static void SetPathBefore(string strHome)         {             string pathlist = GetSysEnvironmentByName("PATH");             string[] list = pathlist.Split(';');             bool isPathExist = false;               foreach (string item in list)             {                 if (item == strHome) isPathExist = true;             }               if (!isPathExist) SetSysEnvironment("PATH", strHome + ";" + pathlist);         }           public static void SetPath(string strHome)         {             string pathlist = GetSysEnvironmentByName("PATH");             string[] list = pathlist.Split(';');             bool isPathExist = false;               foreach (string item in list)             {                 if (item == strHome) isPathExist = true;             }               if (!isPathExist) SetSysEnvironment("PATH", pathlist + strHome + ";");         }         } }