将图像源设置为 URI [英] Set image source to a URI

问题描述

如果我有一个指向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"/>

If i have a link to an image online and i want to set the image source to this uri, how should i do it best? The code i'm trying is shown below.
<Image Name="Poster" Height="400" Width="250" VerticalAlignment="Top" Margin="0,10,8,0"/>

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

此外，如果我想缓存此图像以再次加载它，这是如何完成的?
谢谢

Also, if i want to cache this image to load it again how is this done?
Thanks

推荐答案

这是正确的做法.如果您想缓存图像以供以后重用，您可以随时将其下载到独立存储中.使用带有 OpenReadAsync 的 WebClient - 传递图像 URI 并将其存储在本地.

This is the right way to do it. If you want to cache the image for later re-use, you could always download it in the Isolated Storage. Use a WebClient with OpenReadAsync - pass the image URI and store it locally.

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;
}

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