C#读取环境变量并设置环境变量简单方法（需管理员权限操作,否则写入失败）

public void Regedit()
        {
            try
            {
                string path = Environment.GetEnvironmentVariable("path");
                string new_path = path + ";" + @"C:\TEST\cmd\";
                Environment.SetEnvironmentVariable("path", new_path, EnvironmentVariableTarget.Machine);
            }
            catch (Exception ex)
            {
                MessageBox.Show("小主添加环境变量报错了,原因：" + ex.Message, "错误", MessageBoxButtons.OK, MessageBoxIcon.Warning);

            }

        }