Question

我目前正在开展一个项目，用户需要从照片库中选择图像并导入。使用以下代码，我可以导入图片，但我有几个问题。

导入时命名的图像是什么？
导入后的图片在哪里
是否可以在再次打开应用程序时保存该图像并重新加载（即使用隔离存储）

下载教程中的代码

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

PhotoResult包含OriginalFileName。
当PhotoChoserTask完成时，PhotoResult.ChosenPhoto会为您提供照片数据的流。

是的，您可以将图像存储在隔离的存储空间中。

  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();
        }
    }

导入图片并保存到隔离存储WP7

1 个答案: