1

我正在将 URL 链接中的图像保存到隔离存储，稍后我需要将其绑定到图像。

这是我获取并保存图像的代码：（
路径值和值是类属性）

private void saveImage(string name)
{
        path = name;

        string uri = "http://sherutnetphpapi.cloudapp.net/mini_logos/" + path;
        WebClient m_webClient = new WebClient();
        imageUri = new Uri(uri, UriKind.Relative);
        m_webClient.OpenReadCompleted += new OpenReadCompletedEventHandler(webClient_ImageOpenReadCompleted);
        m_webClient.OpenReadAsync(imageUri);
}

void webClient_ImageOpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
        using (IsolatedStorageFile myIsf = IsolatedStorageFile.GetUserStoreForApplication())
        {
            if (myIsf.FileExists(path))
            {
                myIsf.DeleteFile(path);
            }

            IsolatedStorageFileStream fileStream = myIsf.CreateFile(path);

            StreamResourceInfo sri = null;
            sri = Application.GetResourceStream(imageUri);

            BitmapImage bitmap = new BitmapImage();
            bitmap.SetSource(sri.Stream);
            WriteableBitmap wb = new WriteableBitmap(bitmap);

            // Encode WriteableBitmap object to a JPEG stream.
            System.Windows.Media.Imaging.Extensions.SaveJpeg(wb, fileStream, wb.PixelWidth, wb.PixelHeight, 0, 85);
            wb.SaveJpeg(fileStream, wb.PixelWidth, wb.PixelHeight, 0, 85);
            fileStream.Close();
        }
}

在另一个类中，我读取图像并将其绑定到图像源：

public class CompanyItem
{
    public String companyIcon { get; set; } //save the file name in the isolated storge
    public String companyName { get; set; }

    [IgnoreDataMember]
    public BitmapImage ReadImageFromStorage 
    {
        get
        {
            BitmapImage image = new BitmapImage();
            IsolatedStorageFile isoStore = IsolatedStorageFile.GetUserStoreForApplication();
            string isoFileName = this.companyIcon;
            var stream = isoStore.OpenFile(isoFileName, System.IO.FileMode.Open);
            image.SetSource(stream);
            return image;
        }
    }

xml代码是：

<Image Height="63" HorizontalAlignment="Left" Margin="392,7,0,0" Name="imgConpamyIcon" Stretch="Fill" VerticalAlignment="Top" Width="70" CacheMode="BitmapCache" Source="{Binding ReadImageFromStorage}" />

图像位于 listBox 内的 listBox 中

请帮助我....它让我发疯

4

1 回答 1

1

在彻底检查了您的代码之后，我得到了一些东西：

在您的 SaveImage 类中，imageUri = new Uri(uri, UriKind.Relative); 将其更改为UriKind.Absolute

然后在webClient_ImageOpenReadCompleted你可以直接设置bitmap.SetSource(e.Result);而不是使用StreamResourceInfo类

再说一次，我不知道将 Image 标签的 Source 属性绑定到 XAML 中的 BitmapImage 是否有效（在后面的代码中有效）

于 2012-06-20T13:35:00.917 回答