C#檔案上傳下載

1、檔案上傳 

/// <summary>
        /// WebClient上傳檔案至伺服器
        /// </summary>
        /// <param name="fileNamePath">檔案名稱，全路徑格式</param>
        /// <param name="uriString">伺服器檔案夾路徑</param>
        private void UpLoadFile(string fileNamePath, string uriString)
        {
            string fileName = fileNamePath.Substring(fileNamePath.LastIndexOf("\\") + 1);
            NewFileName = DateTime.Now.ToString("yyMMddhhmmss") + DateTime.Now.Millisecond.ToString() + fileNamePath.Substring(fileNamePath.LastIndexOf("."));
            string fileNameExt = fileName.Substring(fileName.LastIndexOf(".") + 1);
            if (uriString.EndsWith("/") == false) uriString = uriString + "/";
            uriString = uriString + NewFileName;
            UpFileName = NewFileName;
            /**/
            /// 建立WebClient執行個體
            WebClient myWebClient = new WebClient();
            myWebClient.Credentials = CredentialCache.DefaultCredentials;
            // 要上傳的檔案
            FileStream fs = new FileStream(fileNamePath, FileMode.Open, FileAccess.Read);
            //FileStream fs = OpenFile();
            BinaryReader r = new BinaryReader(fs);
            try
            {
                //使用UploadFile方法可以用下面的格式
                //myWebClient.UploadFile(uriString,"PUT",fileNamePath);
                byte[] postArray = r.ReadBytes((int)fs.Length);
                Stream postStream = myWebClient.OpenWrite(uriString, "PUT");
                if (postStream.CanWrite)
                {
                    postStream.Write(postArray, 0, postArray.Length);
                }
                else
                {
                    MessageBox.Show("檔案目前不可寫！");
                }
                postStream.Close();
            }
            catch
            {
                MessageBox.Show("檔案上傳失敗，請稍候重試~");
            }
        }

 

2、檔案下載

  string filePath = System.AppDomain.CurrentDomain.BaseDirectory.ToString()+"ProgramOut.xml";//路徑 
                WebClient client = new WebClient();
                string fileName = filePath.Substring(filePath.LastIndexOf("\\") + 1); //被下載的檔案名稱
                SaveFileDialog saveFileDialog = new SaveFileDialog();
                saveFileDialog.Filter = "XML檔案|*.xml";
                saveFileDialog.FilterIndex = 2;
                saveFileDialog.RestoreDirectory = true;
                if (saveFileDialog.ShowDialog() == DialogResult.OK)
                {
                    string fName = saveFileDialog.FileName;
                    string Path = fName; //另存新檔的絕對路徑＋檔案名稱
                    try
                    {
                        WebRequest myre = WebRequest.Create(Path);
                    }
                    catch
                    {
                        MessageBox.Show("檔案下載失敗", "Error");
                    }
                    try
                    {
                        client.DownloadFile(filePath, Path);
                        MessageBox.Show("檔案匯出成功！！", "系統提示！", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    }
                    catch
                    {
                        MessageBox.Show("檔案下載失敗", "Error");
                    }