导入图片并保存到隔离存储 WP7

Question

我目前正在开展一个项目，用户需要从那里的照片库中选择一张图片并将其导入。使用以下代码，我可以导入图片，但我有几个问题。

1. 导入时图像的名称是什么？
2. 导入后图像位于何处
3. 是否可以保存该图像并在再次打开应用程序时重新加载（即使用隔离存储）

这是教程中的代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Tasks;
using System.IO;
using System.Windows.Media.Imaging;

namespace PhoneApp4
{
    public partial class MainPage : PhoneApplicationPage
    {
        // Constructor
        public MainPage()
        {
            InitializeComponent();
        }
        PhotoChooserTask selectphoto = null;
        private void button1_Click(object sender, RoutedEventArgs e)
        {
            selectphoto = new PhotoChooserTask();
            selectphoto.Completed += new EventHandler<PhotoResult>(selectphoto_Completed);
            selectphoto.Show();

        }

        void selectphoto_Completed(object sender, PhotoResult e)
        {
            if (e.TaskResult == TaskResult.OK)
            {

                BinaryReader reader = new BinaryReader(e.ChosenPhoto);
                image1.Source = new BitmapImage(new Uri(e.OriginalFileName));

            }
        }
    }
}

Answer 1

1. PhotoResult 包含 OriginalFileName。
2. 当 PhotoChoserTask 完成 PhotoResult.ChosenPhoto 为您提供照片数据流。

3. 是的，此时您可以将图像存储在独立存储中。

     private void Pick_Click(object sender, RoutedEventArgs e)
     {
          var pc = new PhotoChooserTask();
          pc.Completed += pc_Completed;
          pc.Show();
     } 
   
       void pc_Completed(object sender, PhotoResult e)
       {
           var originalFilename = Path.GetFileName(e.OriginalFileName);
           SaveImage(e.ChosenPhoto, originalFilename, 0, 100);
       }
   
       public static void SaveImage(Stream imageStream, string fileName, int orientation, int quality)
       {
           using (var isolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())
           {
               if (isolatedStorage.FileExists(fileName))
                   isolatedStorage.DeleteFile(fileName);
   
               var fileStream = isolatedStorage.CreateFile(fileName);
               var bitmap = new BitmapImage();
               bitmap.SetSource(imageStream);
   
               var wb = new WriteableBitmap(bitmap);
               wb.SaveJpeg(fileStream, wb.PixelWidth, wb.PixelHeight, orientation, quality);
               fileStream.Close();
           }
       }