1、在伺服器設定一個共享資料夾，在這裡我的伺服器ip地址是10.200.8.73，共享資料夾名字是share，訪問許可權，使用者名稱是administrator，密碼是11111111。

2、新建一個控制檯專案。

3、新增後臺程式碼如下：

class Program
    {
        static void Main(string[] args)
        {

            bool status = false;

            //連線共享資料夾
            status = connectState(@"\\10.200.8.73\share", "administrator
 
", "11111111");
            if (status)
            {
                //共享資料夾的目錄
                DirectoryInfo theFolder = new DirectoryInfo(@"\\10.200.8.73\share");
                //相對共享資料夾的路徑
                string fielpath=@"\123\456\";
                //獲取儲存檔案的路徑
                string filename = theFolder.ToString() +fielpath ;
                
 
//執行方法
                Transport(@"D:\1.jpg", filename, "1.jpg");

            }
            else
            {
                //ListBox1.Items.Add("未能連線！");
            }
            Console.ReadKey();
        }

        public static bool connectState(string path)
        {
            return connectState(path, ""
 
, "");
        }
        /// <summary>
        /// 連線遠端共享資料夾
        /// </summary>
        /// <param name="path">遠端共享資料夾的路徑</param>
        /// <param name="userName">使用者名稱</param>
        /// <param name="passWord">密碼</param>
        /// <returns></returns>
        public static bool connectState(string path, string userName, string passWord)
        {
            bool Flag = false;
            Process proc = new Process();
            try
            {
                proc.StartInfo.FileName = "cmd.exe";
                proc.StartInfo.UseShellExecute = false;
                proc.StartInfo.RedirectStandardInput = true;
                proc.StartInfo.RedirectStandardOutput = true;
                proc.StartInfo.RedirectStandardError = true;
                proc.StartInfo.CreateNoWindow = true;
                proc.Start();
                string dosLine = "net use " + path + " " + passWord + " /user:" + userName;
                proc.StandardInput.WriteLine(dosLine);
                proc.StandardInput.WriteLine("exit");
                while (!proc.HasExited)
                {                   
                    proc.WaitForExit(1000);
                }
                string errormsg = proc.StandardError.ReadToEnd();
                proc.StandardError.Close();
                if (string.IsNullOrEmpty(errormsg))
                {
                    Flag = true;
                }
                else
                {
                    throw new Exception(errormsg);
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                proc.Close();
                proc.Dispose();
            }
            return Flag;
        }

        /// <summary>
        /// 向遠端資料夾儲存本地內容，或者從遠端資料夾下載檔案到本地
        /// </summary>
        /// <param name="src">要儲存的檔案的路徑，如果儲存檔案到共享資料夾，這個路徑就是本地檔案路徑如：@"D:\1.avi"</param>
        /// <param name="dst">儲存檔案的路徑，不含名稱及副檔名</param>
        /// <param name="fileName">儲存檔案的名稱以及副檔名</param>
        public static void Transport(string src, string dst,string fileName)
        {

            FileStream inFileStream = new FileStream(src, FileMode.Open);
            if (!Directory.Exists(dst))
            {
                Directory.CreateDirectory(dst);
            }
            dst = dst  + fileName;
            FileStream outFileStream = new FileStream(dst, FileMode.OpenOrCreate);

            byte[] buf = new byte[inFileStream.Length];

            int byteCount;

            while ((byteCount = inFileStream.Read(buf, 0, buf.Length)) > 0)
            {

                outFileStream.Write(buf, 0, byteCount);

            }

            inFileStream.Flush();

            inFileStream.Close();

            outFileStream.Flush();

            outFileStream.Close();

        }
    }