Silverlight 图像上传器——救命！

Question

以下是图像调整器/压缩器/上传器的代码主体。这是我的第一个 silverlight 项目，我在线程和 gui 更新以及 webclient 部分方面遇到了麻烦，该部分不起作用。据我所知，调整大小和重新采样似乎执行得很好。问题是gui更新和上传。希望我已经提供了足够的信息让您了解正在发生的事情。

如果您想帮助我，并需要更多信息，我可以根据您的要求通过电子邮件将项目以 zip 形式发送给您，去掉敏感代码。

感谢您的帮助。

 namespace ulx
 {
    public partial class Page : UserControl
{

    public Page()
    {
        InitializeComponent();
        //Import images from file browse dialog
        this.Browse.Click += ImportFiles;
        this.thw.Text = "0";
        this.thh.Text = "0";
        this.rh.Text = "0";
        this.rw.Text = "0";
        this.Exec.IsEnabled = false;
        //Invoke the resize/compressions/uploader sequence
        this.Exec.Click += ExecP;
        this.mProgressBar.Visibility = Visibility.Collapsed;
        this.transc.Visibility = Visibility.Collapsed; 
    }

    public FileInfo [] Files;


    //select jpegs      
    public void ImportFiles(object sender,RoutedEventArgs e)
    {
        OpenFileDialog openDialog = new OpenFileDialog();
        openDialog.Filter = "JPEG Files (*.jpg;*.jpeg)|*.jpg;*.jpeg";
        openDialog.Multiselect = true; 
         if (openDialog.ShowDialog().GetValueOrDefault(false))
        {
            this.Files = (FileInfo [])openDialog.Files;             
            this.Imgcount.Text = "Image Count: "+this.Files.Length;

            this.Exec.IsEnabled = true;
        }   
    }


    public void ExecP(object Sender, RoutedEventArgs e)
    {
       //the main process 
       this.Process();

    }

    public void Process()
    {
            Configuration.thw = Convert.ToInt32(this.thw.Text);
            Configuration.thh = Convert.ToInt32(this.thh.Text);
            Configuration.rh = Convert.ToInt32(this.rh.Text);
            Configuration.rw = Convert.ToInt32(this.rw.Text);
            Configuration.dest = this.Dest.Text;
            if (Configuration.dest == "")
            {
                System.Windows.Browser.HtmlPage.Window.Alert("Invalid Dest:");
            }
            if (Configuration.thw == 0 || Configuration.thh == 0 || Configuration.rw == 0 || Configuration.rh == 0)
            {
                System.Windows.Browser.HtmlPage.Window.Alert("Invalid Resize Definitions");
                return;
            }
            //hide and disable a bunch of gui controls
            this.Browse.IsEnabled = false;
            this.thw.Visibility = Visibility.Collapsed;
            this.thh.Visibility = Visibility.Collapsed;
            this.rw.Visibility = Visibility.Collapsed;
            this.rh.Visibility = Visibility.Collapsed;
            this.c1.Visibility = Visibility.Collapsed;
            this.c2.Visibility = Visibility.Collapsed;
            this.c3.Visibility = Visibility.Collapsed;
            this.c4.Visibility = Visibility.Collapsed;
            this.Dest.Visibility = Visibility.Collapsed;
            this.transc.Visibility = Visibility.Visible;
            //enable and show progressbar
            this.mProgressBar.Visibility = Visibility.Visible;
            this.mProgressBar.Minimum = 0;
            this.mProgressBar.Maximum = this.Files.Length * 2;
            int i = 0;
            foreach (FileInfo file in this.Files)
            {
                //Resize thumb
             WriteableBitmap wb = null;
              this.transc.Text = "Creating Thumb (" + Configuration.thw + "," + Configuration.thh + ") :" + file.Name;

                using (FileStream stream = file.OpenRead())
                {
                    wb = ulxConverter.Imager.GetImageSource(stream, Configuration.thw, Configuration.thh);
                }
                string text = "";
                // compress thumb
                using (Stream Source = ulxUtil.JpgEncoder.Encode(wb, 50))
                {
                    StreamReader reader = new StreamReader(Source);
                    text = reader.ReadToEnd();
                }
                //upload thumb
                Thread.Sleep(1);
this.transc.Text = "Uploading Thumb: " + file.Name;
                Uploader tu = new Uploader("/cgi-bin/SIDES/ulx.cgi", "user", "pass", Configuration.dest, "" + file.Name, 1, text);
                Thread myThread = new Thread(new ThreadStart(tu.doit));
                myThread.Start();
this.mProgressBar.Value = i++;
this.transc.Text = "Creating Resample (" + Configuration.rw + "," + Configuration.rh + ") :" + file.Name;
                wb = null;
                //create resample
                using (FileStream stream = file.OpenRead())
                {
                    wb = ulxConverter.Imager.GetImageSource(stream, Configuration.rw, Configuration.rh);
                }
                Thread.Sleep(1);
                text = "";
                //compress resample
                using (Stream Source = ulxUtil.JpgEncoder.Encode(wb, 20))
                {
                    StreamReader reader = new StreamReader(Source);
                    text = reader.ReadToEnd();
                }
                Thread.Sleep(1);
                //uploud resample
                this.transc.Text = "Uploading Resample: " + file.Name;
                Uploader ru = new Uploader("/cgi-bin/SIDES/ulx.cgi", "user", "pass", Configuration.dest, file.Name, 0, text);

                Thread myThreadT = new Thread(new ThreadStart(ru.doit));
                myThreadT.Start();
                this.mProgressBar.Value = i++;
                //end of loop
            }

            //ok, we are done. hide progress and show hidden controls
        this.mProgressBar.Visibility = Visibility.Collapsed;
            this.transc.Visibility = Visibility.Collapsed;
            this.Browse.IsEnabled = true;
            this.thw.Visibility = Visibility.Visible;
            this.thh.Visibility = Visibility.Visible;
            this.rw.Visibility = Visibility.Visible;
            this.rh.Visibility = Visibility.Visible;
            this.c1.Visibility = Visibility.Visible;
            this.c2.Visibility = Visibility.Visible;
            this.c3.Visibility = Visibility.Visible;
            this.c4.Visibility = Visibility.Visible;
            this.Dest.Visibility = Visibility.Visible;
    }
  }

public static class Configuration
{
    public static int thw;
    public static int thh;
    public static int rw;
    public static int rh;
    public static string src;
    public static string dest;
}



public class Uploader
{
    public string url;
    public string user;
    public string pass;
    public string path;
    public string source;       
    public int MODE;
    public string fn;       
    public string imgdata;
    private bool is_mac_unix = false;

    public Uploader(string url,string user,string pass,string path,string fn,int MODE,string imgdata)
    {
        this.url = url;
        this.user = user;
        this.pass = pass;
        this.path = path;
        this.fn = fn;
        this.MODE = MODE;
        this.imgdata = imgdata;

        string t = ""+Environment.OSVersion;
        if(t.IndexOf("x") != -1)
        {
            this.is_mac_unix = true;
        }

    }

    private ManualResetEvent mre = new ManualResetEvent(false);

    public void doit()
    {
        //string BODY = "datastring";
        WebClient sender = new WebClient();
        sender.OpenReadCompleted += new OpenReadCompletedEventHandler(this.ReadComplete);
        sender.OpenReadAsync(new Uri(this.url + "?blob=" + this.imgdata,UriKind.Absolute));
       mre.WaitOne();
    }
    public bool T = false;


    public void ReadComplete(object sender, OpenReadCompletedEventArgs e)
    {
        if (e.Error == null)
        {
            this.T = true;
        }
        mre.Set();
    }

Answer 1

正如您在其他问题中所指出的，您确实不想使用 ManualResetEvent 东西。当我有机会时，我会通过重构您的代码来更新这个答案。然而，解决方案的关键项是 BackgroundWorker 类。这将帮助您从主 UI 线程中完成所有这些工作。