CSharp: Download Imge

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using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.IO; using System.Net; using System.Net.Http; using System.Net.Http.Headers; using System.Data; using System.Text; using System.Threading; using System.Threading.Tasks; using RestSharp; using RestSharp.Extensions; using RestSharp.Authenticators; using RestSharp.Deserializers; using RestSharp.Validation; using Geovin.Du.Commn;   /// <summary> /// 涂聚文 Geovin Du geovindu /// /// </summary> public partial class DownloadImge : System.Web.UI.Page {         /// <summary>     ///     /// </summary>     /// <param name="sender"></param>     /// <param name="e"></param>     protected void Page_Load(object sender, EventArgs e)     {       }     /// <summary>     ///     /// </summary>     /// <param name="sender"></param>     /// <param name="e"></param>     protected void Button1_Click(object sender, EventArgs e)     {         string weburl = this.txtURL.Text.Trim();         int stat = int.Parse(this.txtStart.Text.Trim());         int end = int.Parse(this.txtEnd.Text.Trim())+1;         int k = 0;         int er = 0;         for (int i = stat; i< end; i++)         {             string fileurl = HttpContext.Current.Server.MapPath(@"ImgFile//" + i.ToString() +this.txtExift.Text.Trim());               DownloadData(weburl+i.ToString()+this.txtExift.Text.Trim(), fileurl);             k++;         }           Response.Write("Ok" + k.ToString() + ",erro" + er.ToString());       }     /// <summary>     /// 文件下载     /// </summary>     /// <param name="website"></param>     /// <param name="file"></param>     private async void RunBackground(string website, string file)     {         int k = 1;         int er = 1;         var succeed = await DownLoadGlobalHistoryNew(website, file);         if (succeed)         {             k++;         }         else         {             er++;         }     }     /// <summary>     ///     /// </summary>     /// <param name="errfile"></param>     /// <returns></returns>     string geterro(List<string> errfile)     {         string str = string.Empty;         if (errfile.Count > 0)         {             int k = 0;             foreach (string s in errfile)             {                 if (k == 0)                 {                     str = s;                 }                 else                 {                     str = str + "," + s;                 }                 k++;             }           }           return str;     }     /// <summary>     ///     /// </summary>     /// <param name="url"></param>     /// <param name="file"></param>     /// <returns></returns>     public Task<bool> DownLoadGlobalHistoryNew(string url, string file)     {         string dataString = string.Empty;           return Task.Run(() =>         {             var succeed = false;             try             {                 var dataStringNew = new WebClient { Encoding = Encoding.UTF8 }.DownloadString(url);                 if (dataString != dataStringNew)                 {                     dataString = dataStringNew;                     Write(file, dataString);                     succeed = true;                 }             }             catch (Exception)             {               }             return succeed;         });     }     /// <summary>     ///     /// </summary>     /// <param name="file"></param>     /// <param name="dataString"></param>     private void Write(string file, string dataString)     {         try         {             if (File.Exists(file) && !string.IsNullOrWhiteSpace(dataString))                 File.Delete(file);             File.WriteAllText(file, dataString);         }         catch (Exception)         {         }     }     /// <summary>     /// 图片下载     /// </summary>     /// <param name="strFileUrlToDownload"></param>     /// <param name="strfile"></param>     protected void DownloadData(string strFileUrlToDownload, string strfile)     {         WebClient client = new WebClient();         byte[] myDataBuffer = client.DownloadData(strFileUrlToDownload);           MemoryStream storeStream = new MemoryStream();           storeStream.SetLength(myDataBuffer.Length);         storeStream.Write(myDataBuffer, 0, (int)storeStream.Length);           storeStream.Flush();           string currentpath = strfile;// System.IO.Directory.GetCurrentDirectory() + @"\Folder";           using (FileStream file = new FileStream(currentpath, FileMode.Create, System.IO.FileAccess.ReadWrite))         {             byte[] bytes = new byte[storeStream.Length];             storeStream.Read(bytes, 0, (int)storeStream.Length);             file.Write(myDataBuffer, 0, (int)storeStream.Length);             storeStream.Close();         }           //The below Getstring method to get data in raw format and manipulate it as per requirement         string download = Encoding.ASCII.GetString(myDataBuffer);         }   }