c# - 将图像源设置为 URI

Question

如果我有一个在线图像的链接，并且我想将图像源设置为这个 uri，我应该怎么做最好？我正在尝试的代码如下所示。
<Image Name="Poster" Height="400" Width="250" VerticalAlignment="Top" Margin="0,10,8,0"/>

BitmapImage imgSource = new BitmapImage();<br/> imgSource.UriSource = new Uri(movie.B_Poster, UriKind.Relative);<br/> Poster.Source = imgSource;

此外，如果我想缓存此图像以再次加载它，该怎么做？
谢谢

Answer 1

这是正确的做法。如果您想缓存图像供以后重复使用，您可以随时将其下载到独立存储中。将 WebClient 与 OpenReadAsync 结合使用 - 传递图像 URI 并将其存储在本地。

WebClient client = new WebClient();
client.OpenReadCompleted += new OpenReadCompletedEventHandler(client_OpenReadCompleted);
client.OpenReadAsync(new Uri("IMAGE_URL"));

void client_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
    IsolatedStorageFile file = IsolatedStorageFile.GetUserStoreForApplication();

    using (IsolatedStorageFileStream stream = new IsolatedStorageFileStream("image.jpg", System.IO.FileMode.Create, file))
    {
        byte[] buffer = new byte[1024];
        while (e.Result.Read(buffer, 0, buffer.Length) > 0)
        {
            stream.Write(buffer, 0, buffer.Length);
        }
    }
}

阅读它会反过来:

using (IsolatedStorageFileStream stream = new IsolatedStorageFileStream("image.jpg", System.IO.FileMode.Open, file))
{
    BitmapImage image = new BitmapImage();
    image.SetSource(stream);

    image1.Source = image;
}