直接贴代码：

   public class FileHelper
    {
        /// <summary>
        /// 设置文件夹共享
        /// </summary>
        /// <param name="FolderPath">文件夹路径</param>
        /// <param name="ShareName">共享名</param>
        /// <param name="Description">共享注释</param>
        /// <returns></returns>
        public static int ShareNetFolder(string folderPath, string shareName, string description)
        {
            try
            {
                ManagementClass managementClass = new ManagementClass("Win32_Share");
                ManagementBaseObject inParams = managementClass.GetMethodParameters("Create");
                ManagementBaseObject outParams;
                inParams["Description"] = description;
                inParams["Name"] = shareName;
                inParams["Path"] = folderPath;
                inParams["Type"] = 0x0; // Disk Drive
                outParams = managementClass.InvokeMethod("Create", inParams, null);
                if ((uint)(outParams.Properties["ReturnValue"].Value) != 0)
                {
                    Common.WriteLog("Unable to share directory");
                }
                //设置文件夹所有访问权限
                SetFolderAllRight(folderPath, "Everyone", "FullControl");
            }
            catch (Exception ex)
            {
                Common.WriteLog(ex.Message + ":" + ex.StackTrace);
                return -1;
            }
            return 0;
        }
        /// <summary>
        /// 取消文件夹共享
        /// </summary>
        /// <param name="ShareName">文件夹的共享名</param>
        /// <returns></returns>
        public static int CancelShareNetFolder(string ShareName)
        {
            try
            {
                SelectQuery selectQuery = new SelectQuery("Select * from Win32_Share Where Name = '" + ShareName + "'");
                ManagementObjectSearcher searcher = new ManagementObjectSearcher(selectQuery);
                foreach (ManagementObject mo in searcher.Get())
                {
                    mo.InvokeMethod("Delete", null, null);
                }
            }
            catch
            {
                return -1;
            }
            return 0;
        }
        /// <summary>
        /// 设置文件夹所有访问权限
        /// </summary>
        /// <param name="path">文件夹路径</param>
        /// <param name="rightName">权限名称</param>
        /// <param name="power">权限等级</param>
        public static void SetFolderAllRight(string path, string rightName, string power)
        {
            try
            {
                // 获取文件夹信息
                DirectoryInfo dirinfo = new DirectoryInfo(path);
                if ((dirinfo.Attributes & FileAttributes.ReadOnly) != 0)
                {
                    dirinfo.Attributes = FileAttributes.Normal;
                }
                //获得该文件夹的所有访问权限
                DirectorySecurity dirsecurity = dirinfo.GetAccessControl(AccessControlSections.All);
                //设定文件ACL继承
                InheritanceFlags inherits = InheritanceFlags.ContainerInherit | InheritanceFlags.ObjectInherit;
                //添加访问权限规则 完全控制权限
                FileSystemAccessRule everyoneFileSystemAccessRule = new FileSystemAccessRule(rightName, FileSystemRights.FullControl, inherits, PropagationFlags.None, AccessControlType.Allow);
                bool isModified = false;
                dirsecurity.ModifyAccessRule(AccessControlModification.Add, everyoneFileSystemAccessRule, out isModified);
                //设置访问权限
                dirinfo.SetAccessControl(dirsecurity);
            }
            catch (Exception ex)
            {
                Common.WriteLog(ex.Message + ":" + ex.StackTrace);
            }
        }

 写日志方法：

        /// <summary>
        /// 写日志
        /// </summary>
        /// <param name="msg"></param>
        public static void WriteLog(string msg)
        {
            string filePath = GetRootDirectory() + "Log";
            if (!Directory.Exists(filePath))
            {
                Directory.CreateDirectory(filePath);
            }
            string logPath = filePath + "\\" + DateTime.Now.ToString("yyyy-MM-dd") + ".txt";
            try
            {
                using (StreamWriter sw = File.AppendText(logPath))
                {
                    sw.WriteLine("消息：" + msg);
                    sw.WriteLine("时间：" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));
                    sw.WriteLine("**************************************************");
                    sw.WriteLine();
                    sw.Flush();
                    sw.Close();
                    sw.Dispose();
                }
            }
            catch (IOException e)
            {
                using (StreamWriter sw = File.AppendText(logPath))
                {
                    sw.WriteLine("异常：" + e.Message);
                    sw.WriteLine("时间：" + DateTime.Now.ToString("yyy-MM-dd HH:mm:ss"));
                    sw.WriteLine("**************************************************");
                    sw.WriteLine();
                    sw.Flush();
                    sw.Close();
                    sw.Dispose();
                }
            }
        }