如何从隔离存储中获取图像 [英] How get image from isolated storage

问题描述

我有这个XAML

<ListBox Margin="0,0,-12,0" ItemsSource="{Binding Items}" Name="list">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <StackPanel Orientation="Horizontal" Margin="0,0,0,17">
                <!--Replace rectangle with image-->
                <Image Height="100" Width="100" Source="{Binding Img}" Margin="12,0,9,0"/>
                <StackPanel Width="311">
                    <TextBlock  Text="{Binding Pos}"/>
                </StackPanel>
            </StackPanel>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

在代码中:

using (IsolatedStorageFile isoStore = IsolatedStorageFile.GetUserStoreForApplication())
{
    IsolatedStorageFileStream isoStoreStream = isoStore.OpenFile("chart.xml", FileMode.Open);
    using (StreamReader reader = new StreamReader(isoStoreStream))
    {
        XElement xml = XElement.Parse(reader.ReadToEnd());
        var list = from var in xml.Descendants("Pos")
            select new Single
            {
                Pos = Int32.Parse(var.Attribute("id").Value),
                Img = how read from isolated storage the image id.jpg?
            };

public class Single
{
    public int Pos { set; get; }
    public ??? Img { set; get; }
}

我已经将图像保存到隔离存储中，但是问题是:如何从隔离存储中读取名称为id.jpg(1.jpg，2.jpg，3.jpg ...)的图像?

I have already saved the images into isolated storage but the problem is: how can I read from isolated storage the image that have names like id.jpg(1.jpg, 2.jpg, 3.jpg...)?

推荐答案

在您的 Single 类中， Img 属性的类型应为ImageSource.要设置此属性(从IsolatedStorage中读取图像)，您可以执行以下操作:

In your Single Class the Img property should be of type ImageSource. To set this property (read the image from IsolatedStorage) you can do this:

private ImageSource getImageFromIsolatedStorage(string imageName)
{
    BitmapImage bimg = new BitmapImage();

    using (IsolatedStorageFile iso = IsolatedStorageFile.GetUserStoreForApplication())
    {
        using (IsolatedStorageFileStream stream = iso.OpenFile(imageName, FileMode.Open, FileAccess.Read))
        {
            bimg.SetSource(stream);
        }
    }
    return bimg;
}

然后在您的代码段中:

using (IsolatedStorageFile isoStore = IsolatedStorageFile.GetUserStoreForApplication())
{
    IsolatedStorageFileStream isoStoreStream = isoStore.OpenFile("chart.xml", FileMode.Open);
    using (StreamReader reader = new StreamReader(isoStoreStream))
    {
        XElement xml = XElement.Parse(reader.ReadToEnd());
        var list = from var in xml.Descendants("Pos")
            select new Single
            {
                Pos = Int32.Parse(var.Attribute("id").Value),
                Img = getImageFromIsolatedStorage(string.Format("{0}.jpg", Pos));
            };

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