Download pictures in bulk

2. Main code:

Private async void Button_Click (object sender, RoutedEventArgs e) {var htmlcontent = await filedownload Er.            Instance.getasync (Weburl.text);            Htmlagilitypack.htmldocument doc = new htmlagilitypack.htmldocument (); Doc.            Loadhtml (htmlcontent); Label1.            Content = ""; var nodecollection= doc.            Documentnode.selectnodes ("//img"); if (nodecollection!=null) {string imgdirectory = System.IO.Path.Combine (environment.currentdirec                Tory, "IMGs"); if (!                Directory.Exists (imgdirectory)) {directory.createdirectory (imgdirectory);                } progressbar.maximum = Nodecollection.count;                Progressbar.value = 0;                int errorcount = 0;                    foreach (var item in nodecollection) {progressbar.value + = 1; try {var imgsrc=item.Getattributevalue ("src", null);                        myimg img = new myimg (IMGSRC); if (!string. IsNullOrEmpty (IMG. FileName) {await FileDownLoader.Instance.DownLoadImg (IMG, imgdirectory)                        ;  }} catch (Exception ex) {Errorcount                    + = 1; } Label1.                Content = "+progressbar.value+" photos, total "+ progressbar.maximum+" pictures, "+errorcount+" error ";            } progressbar.value = Progressbar.maximum; }

　　

  Public  class Filedownloader    {        HttpClient HttpClient = new HttpClient ();        public static Filedownloader Instance = new Filedownloader ();        Public async Task downloadimg (myimg img,string imgdirectory)        {            var imgdata = await Httpclient.getbytearrayasync (IMG. IMGSRC);            String newfilename = System.IO.Path.Combine (Imgdirectory, IMG. FileName);            using (var stream = File.Open (NewFileName, FileMode.Create))            {                await stream. WriteAsync (imgdata, 0, imgdata.length);            };        }        Public Async task<string> getasync (string url)        {         var response= await  httpclient.getasync (URL);            return await response. Content.readasstringasync ();        }    }

　

    public class myimg    {public        myimg (string imgsrc)        {            if (imgsrc! = null)            {                var startIndex = imgsrc . LastIndexOf (@ "/");                var startIndex1 = Imgsrc.lastindexof (".");                FileName = imgsrc.substring (StartIndex + 1, Startindex1-startindex + 3);                IMGSRC = imgsrc;            }        }        public string FileName {get; set;}        public string Imgsrc {get; set;}    }

　　

Download pictures in bulk