将远程图像保存到独立存储 [英] Save a remote image in to Isolated Storage

问题描述

我尝试使用此代码下载图片:

I tried using this code for download image:

void downloadImage(){
 WebClient client = new WebClient();
 client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(client_DownloadStringCompleted);
                client.DownloadStringAsync(new Uri("http://mysite/image.png"));

        }

void client_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
        {
           //how get stream of image?? 
           PicToIsoStore(stream)
        }

        private void PicToIsoStore(Stream pic)
        {
            using (var isoStore = IsolatedStorageFile.GetUserStoreForApplication())
            {
                var bi = new BitmapImage();
                bi.SetSource(pic);
                var wb = new WriteableBitmap(bi);
                using (var isoFileStream = isoStore.CreateFile("somepic.jpg"))
                {
                    var width = wb.PixelWidth;
                    var height = wb.PixelHeight;
                    Extensions.SaveJpeg(wb, isoFileStream, width, height, 0, 100);
                }
            }
        }

问题是:如何获取图像流?

The problem is: how get the stream of image?

谢谢！

推荐答案

在你的 client_DownloadStringCompleted 中调用 PicToIsoStore 时，你需要把 e.Result 作为参数 方法

You need to put e.Result as a parameter when calling PicToIsoStore inside your client_DownloadStringCompleted method

void client_DownloadStringCompleted(object sender,
     DownloadStringCompletedEventArgs e)
        {
           PicToIsoStore(e.Result);
        }

WebClient 类获取响应并将其存储在 e.Result 变量中.如果你仔细看，e.Result 的类型已经是 Stream 所以它已经准备好传递给你的方法 PicToIsoStore

The WebClient class gets response and stores it in the e.Result variable. If you look carefully, the type of e.Result is already Stream so it is ready to be passed to your method PicToIsoStore

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