JSONを使用してシリアル化

Question

私は、カップルのプロパティをシリアル化する必要があります。私は、ディスク上のファイルを持っているが、私はデシリアライズJSONをしようとすると、私はエラーが発生している

[DataContract] 
public class ImageManipulatorViewModel : BaseViewModel 
{ 
    [DataMember] 
    public ObservableCollection<Collage> ImageList 
    { 
     get { return this.imageList; } 
     set 
     { 
      this.imageList = value; 
      base.RaisePropertyChanged("ImageList"); 
     } 
    } 
var storageFolder = ApplicationData.Current.LocalFolder; 
var sampleFile = await storageFolder.CreateFileAsync("MyProject.Collage", CreationCollisionOption.ReplaceExisting); 
string l =JsonConvert.SerializeObject(this.ImageList); 
await FileIO.WriteTextAsync(sampleFile, l); 
string tres = JsonConvert.DeserializeObject(l).ToString(); 
this.ImageList.Clear(); 
this.ImageList = JsonConvert.DeserializeObject<ObservableCollection<Collage>>(tres.ToString()); 
} 


public class Collage 
{ 
    public Thickness Position { get; set; } 
    public WriteableBitmap Image { get; set; } 
} 

：私はNewtonSoft

から私のコードをJSONシリアライザを使用します。 Could not create an instance of type Windows.Storage.Streams.IBuffer. Type is an interface or abstract class and cannot be instantiated. Path '[0].Image.PixelBuffer', line 10, position 23.

JSONファイル

[{"Position":{"Left":0.0,"Top":0.0,"Right":0.0,"Bottom":0.0},"Image":{"PixelBuffer":{},"PixelHeight":1600,"PixelWidth":2560,"Dispatcher":{"HasThreadAccess":true,"CurrentPriority":0}}},{"Position":{"Left":490.0,"Top":0.0,"Right":0.0,"Bottom":0.0},"Image":{"PixelBuffer":{},"PixelHeight":1600,"PixelWidth":2560,"Dispatcher":{"HasThreadAccess":true,"CurrentPriority":0}}}] 

何の `s私の問題？

Answer 1

 var savePicker = new FileSavePicker 
      { 
       SuggestedStartLocation = PickerLocationId.PicturesLibrary, 
       SuggestedFileName = string.Format("MyProject{0}", DateTime.Now.ToString("ddMMyyyyHHmm")) 
      }; 
      savePicker.FileTypeChoices.Add("Project", new List<string> {".collage"}); 
      var file = await savePicker.PickSaveFileAsync(); 
      if (file != null) 
      { 
       var ser = JsonConvert.SerializeObject(this.ImageList.ToList()); 
       await FileIO.WriteTextAsync(file, ser); 
      } 

Answer 2

JSONファイルが有効でない/完全ではありません。

[ 
    { 
     "Position": {"Left":0.0,"Top":0.0,"Right":0.0,"Bottom":0.0}, 
     "Image":{ 
      "PixelBuffer": {}, 
      "PixelHeight":1600, 
      "PixelWidth":2560, 
      "Dispatcher":{"HasThreadAccess":true,"CurrentPriority":0} 
     } 
    }, <=== here it ends without a following item or closing the array. 

ファイルを作成していますが、ファイルをフラッシュしたり閉じたりしていません。

var sampleFile = await storageFolder.CreateFileAsync("MyProject.Collage", CreationCollisionOption.ReplaceExisting); 
string l =JsonConvert.SerializeObject(this.ImageList); 
await FileIO.WriteTextAsync(sampleFile, l); // <== no FileIO.Close(sampleFile)