1、 手机端
private void btnUploadPic_Click(object sender, RoutedEventArgs e)
{
    PhotoChooserTask pct = new PhotoChooserTask();
    pct.ShowCamera = true;
    pct.Completed += new EventHandler<PhotoResult>(pct_Completed);
    pct.Show();
}

void pct_Completed(object sender, PhotoResult e)
{
   if (e.TaskResult == TaskResult.OK)
   {
       WebClient wc = new WebClient();
       wc.OpenWriteCompleted += new OpenWriteCompletedEventHandler(wc_OpenWriteCompleted);
       wc.WriteStreamClosed += new WriteStreamClosedEventHandler(wc_WriteStreamClosed);
       wc.OpenWriteAsync(new Uri("http://127.0.0.1:21299/MyNoteWeb/ashx/UpLoadImg.ashx"), "POST", e.ChosenPhoto);
    }

}

void wc_WriteStreamClosed(object sender, WriteStreamClosedEventArgs e)
{
    if (e.Error == null)
    {
       MessageBox.Show("上传成功");
    }
    else
    {
       MessageBox.Show("上传失败");
    }
}

void wc_OpenWriteCompleted(object sender, OpenWriteCompletedEventArgs e)
{
    if (e.Error == null)
    {
        using (Stream photoStream = (Stream)e.UserState)
       {
          photoStream.CopyTo(e.Result);
          e.Result.Close();
       }
    }
}
2、(asp.net)服务端：
public void ProcessRequest (HttpContext context) {
    context.Response.ContentType = "text/html";
    upLoad(context);
    context.Response.End();
}

private static void upLoad(HttpContext context)
{ 
     using (FileStream fs = File.OpenWrite("c:/1.jpg"))
     {
         context.Request.InputStream.CopyTo(fs);
      }
}

Windows Phone 7 上传图片