导入图片并保存到独立存储WP7

Question

我目前正在开发一个项目，用户需要从那里从照片库中选择图片并导入它。使用下面的代码我可以导入图片，但我有几个问题。

1. 什么是导入时命名的图像？
2. 哪里是位于图像导入一次
3. 是否有可能保存图像，并重新加载它，当应用程序被再次打开（即使用独立存储）

继承人的代码从一个教程

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完成时PhotoResult.ChosenPhoto为您提供了照片数据流。

3. 是的，那时你可以将图像存储在独立的存储器中。

   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(); 
        } 
       }