如何獲取所有照片與文件挑選器

Question

我m做一個簡單的窗口手機8.1應用程序我想獲得一張照片顯示在應用程序，然後用戶選擇PickMultipleFilesAndContinue .....但即時通訊不知道如何做到這一點。我做這個代碼openfiler選擇器帶我到電話庫.....有沒有其他方式可以在Windows Phone 8.1中獲取照片？

 FileOpenPicker openPicker = new FileOpenPicker(); 
     openPicker.ViewMode = PickerViewMode.Thumbnail; 
     openPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary; 
     openPicker.FileTypeFilter.Add(".jpg"); 
     openPicker.FileTypeFilter.Add(".jpeg"); 
     openPicker.FileTypeFilter.Add(".png"); 

     openPicker.PickMultipleFilesAndContinue(); 
     view.Activated += view_Activated; 
    } 
     private async void view_Activated(CoreApplicationView sender, Windows.ApplicationModel.Activation.IActivatedEventArgs args1) 
    { 


      FileOpenPickerContinuationEventArgs args = args1 as FileOpenPickerContinuationEventArgs; 

      bitmapImages = new ObservableCollection<BitmapImage>(); 
      IReadOnlyList<StorageFile> files = args.Files; 
      if (files.Count > 0) 
      { 
       StringBuilder output = new StringBuilder("Picked files:\n"); 
       // Application now has read/write access to the picked file(s) 
       foreach (StorageFile file in files) 
       { 
        output.Append(file.Name + "\n"); 

        using (var stream = await file.OpenAsync(Windows.Storage.FileAccessMode.Read)) 
        { 
         try 
         { 
          BitmapImage bitmapImage = new Windows.UI.Xaml.Media.Imaging.BitmapImage(); 
          bitmapImage.DecodePixelHeight = 200; 
          bitmapImage.SetSource(stream); 
          bitmapImages.Add(bitmapImage); 

         } 
         catch (ArgumentException Ex) 
         { 
          Debug.WriteLine("Exception ", Ex.Message); 
         } 

        } 
       } 
       ImageCollection.ItemsSource = bitmapImages; 
       OutputTextBlock.Text = output.ToString(); 
      } 
      else 
      { 
       OutputTextBlock.Text = "Operation cancelled."; 
      } 

    } 

通過這種方式只有選定的照片。我想所有顯示，然後用戶從他們中選擇.....

Answer 1

您可以通過編程訪問照片，然後將它們添加到您的ImageCollection。我調整了照片的大小，否則應用會在我的手機上崩潰。

StorageFolder pictureFolder = KnownFolders.PicturesLibrary; //or another folder 
IReadOnlyList<IStorageItem> nameList = await pictureFolder.GetItemsAsync(); 
var bitmapImages = new ObservableCollection<BitmapImage>(); 

foreach (var item in nameList) 
{ 
    if (item is StorageFile) 
    { 
     if (item.Name.Substring(item.Name.Length - 4, 3).ToLower() == "jpeg" || item.Name.Substring(item.Name.Length - 3, 3).ToLower() == "jpg" || item.Name.Substring(item.Name.Length - 3, 3).ToLower() == "png") 
     { 
      Image image = new Image(); 
      StorageFile file = await pictureFolder.GetFileAsync(item.Name); 
      IRandomAccessStream fileStream = await file.OpenAsync(Windows.Storage.FileAccessMode.Read); 
      BitmapImage bitmapImage = new BitmapImage(); 
      bitmapImage.SetSource(fileStream); 
      if (bitmapImage.DecodePixelHeight >= bitmapImage.DecodePixelWidth) 
      { 
       bitmapImage.DecodePixelWidth = bitmapImage.DecodePixelHeight/100; 
       bitmapImage.DecodePixelHeight = 100; 
      } 
      else 
      { 
       bitmapImage.DecodePixelHeight = bitmapImage.DecodePixelWidth/100; 
       bitmapImage.DecodePixelWidth = 100; 
      } 
      bitmapImages.Add(bitmapImage); 
     } 
    } 
}