如何添加隔离存储

Question

我正在尝试将图片保存到我的媒体库中。

这是我的xaml.cs文件

    using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
using System.Collections.ObjectModel;
using Windows.UI.Xaml.Media.Imaging;


// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=391641

namespace App5
{
    /// <summary>
    /// An empty page that can be used on its own or navigated to within a Frame.
    /// </summary>
    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();
            lstImage.ItemsSource = GetAllPhotos();
            this.NavigationCacheMode = NavigationCacheMode.Required;
        }
        private ImageSource GetImageSource(string fileName)
        {
            return new BitmapImage(new Uri(fileName, UriKind.Absolute));
        }
        private ObservableCollection<Photo> GetAllPhotos()
        {
            ObservableCollection<Photo> photos = new ObservableCollection<Photo>
                                                   {

                                                       new Photo{PhotoSource = GetImageSource("http://winartstyle.com/wp8/set1/1_0002_10453.jpg")},
                                                       new Photo{PhotoSource = GetImageSource("http://winartstyle.com/wp8/set1/1_0003_10443.jpg")},
                                                       //new Photo{PhotoSource = GetImageSource("Images/Harish.jpg")},
                                                       //new Photo{PhotoSource = GetImageSource("Images/HarishV.jpg")},
                                                       //new Photo{PhotoSource = GetImageSource("Images/Abhi.jpg")},
                                                       //new Photo{PhotoSource = GetImageSource("Images/Suprotim.jpg")},
                                                       //new Photo{PhotoSource = GetImageSource("Images/HarishVAlone.png")},
                                                       //new Photo{PhotoSource = GetImageSource("Images/Pinal.jpg")},
                                                       //new Photo{PhotoSource = GetImageSource("Images/Shaivi.jpg")},                                                       new Photo{PhotoSource = GetImageSource("Images/Shobhan.jpg")},
                                                       //new Photo{PhotoSource = GetImageSource("Images/Vikram.jpg")},
                                                       //new Photo{PhotoSource = GetImageSource("Images/Host.jpg")}

                                                   };
            return photos;
        }
        private void SaveButton_Click(object sender, EventArgs e)
        {

        }
        /// <summary>
        /// Invoked when this page is about to be displayed in a Frame.
        /// </summary>
        /// <param name="e">Event data that describes how this page was reached.
        /// This parameter is typically used to configure the page.</param>
        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            // TODO: Prepare page for display here.

            // TODO: If your application contains multiple pages, ensure that you are
            // handling the hardware Back button by registering for the
            // Windows.Phone.UI.Input.HardwareButtons.BackPressed event.
            // If you are using the NavigationHelper provided by some templates,
            // this event is handled for you.
        }
    }
}

这是我的xaml

    <Page
    x:Class="App5.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:App5"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

    <Grid x:Name="LayoutRoot" Background="Transparent">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">
            <TextBlock x:Name="ApplicationTitle"  />
        </StackPanel>

        <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,-20,12,0">
            <ListBox x:Name="lstImage"  Margin="0,-20,0,0">
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <StackPanel Orientation="Horizontal">
                            <Image Source="{Binding PhotoSource}"


                                    />
                        </StackPanel>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>
        </Grid>
    </Grid>
    <Page.BottomAppBar>
        <CommandBar IsSticky="True" >
            <AppBarButton  Icon="Save" Label="Save" x:Name="SaveButton" Click="SaveButton_Click" />


        </CommandBar>
    </Page.BottomAppBar>
</Page>

我试图做这样的事情

private void SaveButton_Click(object sender, EventArgs e)
        {



            using (var store = IsolatedStorageFile.GetUserStoreForApplication())
            {

                if (!store.FileExists(System.IO.Path.Combine()) ||
                    store.FileExists(System.IO.Path.Combine( )) && MessageBox.Show("Overwrite the file?", "Question", MessageBoxButton.OKCancel) == MessageBoxResult.OK)
                {
                    using (var stream = store.CreateFile(System.IO.Path.Combine( )))
                    {
                        stream.Write(_imageAsByte, 0, _imageAsByte.Length);
                    }
                }
            }
        }
        # endregion

        public byte[] _imageAsByte { get; set; }
    }
}

但它没有工作

我真的可以帮助解决这个问题。 我将从我的网页上加载许多图片，如果您喜欢，可以将其保存到手机中并将其用作锁屏或开始屏幕的背景