如何从独立存储中获取映像

本文关键字:获取 映像 存储 独立 | 更新日期: 2023-09-27 17:55:09

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独立存储中,但问题是:如何从独立存储中读取名称为 id.jpg(1.jpg、2.jpg、3.jpg...) 的图像?

如何从独立存储中获取映像

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

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;
}

然后在代码片段中:

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));
            };

这是一个非常完整的示例,说明如何写入和读取 ISO 存储。

http://www.codeproject.com/Articles/38636/Saving-Bitmaps-to-Isolated-Storage-in-Silverlight-.aspx