将对象存储到Windows 8应用程序中的文件 [英] Storing an object to a file in Windows 8 apps

问题描述

（Windows 8应用程序，C＃）



我在每个对象中都有许多图像（.jpg）和音频文件（.mp3）。我想将这些对象存储在单独的文件中，然后再检索内容。我搜索了对象序列化，但找不到适合Windows 8应用程序的示例。

那么，在Windows 8应用程序（C＃）中将对象保存到文件的方法是什么。

如果是对象序列化，请提供示例代码或一个链接。

解决方案

请看我对这个问题的评论。



最好的方法是也许是数据合同：

http：// msdn.microsoft.com/en-us/library/ms733127.aspx [ ^ ]。



请参阅我过去的答案，我提倡这种方法：

< a href =http://www.codeproject.com/Answers/136502/How-can-I-utilize-XML-File-streamwriter-and-reader#answer1>我如何利用我的XML文件编写器和阅读器表单申请？ [ ^ ]，

创建属性文件...... [ ^ ]，

deseralize json字符串数组 [ ^ ]。



答案与.NET有关，强烈推荐。如果你不使用任何.NET语言，请不要责怪我：你甚至没有提到你正在使用的语言。



对于C ++（不是C ++ / CLI），例如，我建议寻找boost序列化： http://www.boost.org/doc/libs/1_53_0/libs/serialization/doc/index.html [ ^ ]。

- SA

Quote：

那么，将对象保存到文件的方法是什么在Windows 8应用程序（C＃）中。

看看这个提示：

Windows 8 App - 使用Windows.Storage命名空间的文件中的数据存储 [ ^ ]

我收到异常：

System.Runtime.Serialization.dll中出现System.Runtime.Serialization.InvalidDataContractException类型的异常，但未在用户代码中处理



附加信息：类型''Windows.UI.Xaml.Media.ImageSource''无法序列化。请考虑使用DataContractAttribute属性对其进行标记，并使用DataMemberAttribute属性标记要序列化的所有成员。如果类型是集合，请考虑使用CollectionDataContractAttribute对其进行标记。有关其他支持的类型，请参阅Microsoft .NET Framework文档。



在serializer.WriteObject（stream1，record1）



该课程为：

 [DataContract（Namespace =   http://www.abcdefg.com）] 
  internal   class 记录
 {
 私人  double  n1; 
  private  BitmapImage bimg; 
 
 内部记录（ double  n1，BitmapImage bimg）
 { 
  this  .n1 = n1; 
 此 .bimg = bimg; 
} 
 [DataMember] 
  internal  BitmapImage image 
 {
 获取 {返回 bimg; } 
  set  {bimg =  value ; } 
} 
 
 [DataMember] 
 内部  double  OperandNumberOne 
 {
  get  { return  n1; } 
  set  {n1 =  value ; } 
} 
 
  public  覆盖  string  ToString（）
 {
  return   string  .Format（ 记录：{0}和图像：{1}，n1，bimg的ToString（））; 
} 
} 

和序列化在这里完成：

  private   async   void  save_Click（ object  sender，RoutedEventArgs e）
 {
 FileOpenPicker openPicker =  new  FileOpenPicker（）; 
 openPicker.ViewMode = PickerViewMode.List; 
 openPicker.SuggestedStartLocation = PickerLocationId.ComputerFolder; 
 openPicker.FileTypeFilter.Add（ 。jpg）; 
 StorageFile file =  await  openPicker.PickSingleFileAsync（）; 
 IRandomAccessStream imageStream =  await  file.OpenReadAsync（）; 
 bitmapImage =  new  BitmapImage（）; 
 bitmapImage.SetSource（imageStream）; 
 ImgUIelement.Source = bitmapImage; 
 
 
 MemoryStream stream1 =  new  MemoryStream（）; 
  //  使用DataContractSerializer将Record对象序列化为内存流。 
 DataContractSerializer serializer =  new  DataContractSerializer（ typeof （Record））; 
记录record1 =  new 记录（ 1 ，bitmapImage）; 
 serializer.WriteObject（stream1，record1）;   //   EXCEPTION HERE   
 
 tbx_OP.Text =  写入流： + record1.ToString（）; 
 
 FileSavePicker fileSavePicker =  new  FileSavePicker（）; 
 fileSavePicker.DefaultFileExtension =  。bla; 
 fileSavePicker.FileTypeChoices.Add（  Bla Files， new  List< string> { 。bla}）; 
 fileSavePicker.SuggestedFileName =  新Bla文件; 
 fileSavePicker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary; 
  var  sfile =  await  fileSavePicker.PickSaveFileAsync（）; 
 
 使用（Stream x =  await  sfile.OpenStreamForWriteAsync（））
 {
 x.Seek（ 0 ，SeekOrigin.Begin）; 
 stream1.WriteTo（x）; 
} 
} 
 < /   string  >  

我的要求是序列化一个包含图像列表和列表的对象StorageFiles到我的Windows应用商店应用程序中的文件。我试图找出是否有可能序列化单个图像。

如果可能，任何人都可以提供类似这样的类的示例代码..

公共类ExClass 
 {
列表<  图像 >  imgList = new List <   Image  > （）; 
列表<   StorageFile  >  audList = new List <   StorageFile  > < /跨度>（）; 
} 

我没有找到任何序列化除了字符串，Int，Double ... Primitive之外的类型的示例的。

(Windows 8 Apps, C#)
Hi,
I have a number of Images(.jpg) and Audio-files(.mp3) in each object. I would like to store these objects in separate files and retrieve the content later. I searched for Object Serialization, but could not find a right example for Windows 8 apps.
So, what are the ways of saving the objects to files in Windows 8 apps(C#).
If it is Object Serialization, please give a sample piece of code or a link to it.

解决方案

Please see my comment to the question.

The best method is perhaps the Data Contract:
http://msdn.microsoft.com/en-us/library/ms733127.aspx[^].

Please see my past answers where I advocate this approach:
How can I utilize XML File streamwriter and reader in my form application?[^],
Creating property files...[^],
deseralize a json string array[^].

The answers are related to .NET, highly recommended. If you don''t use any .NET languages, please don''t blame me: you did not even mention the language you are using.

For C++ (not C++/CLI), for example, I would recommend to look for boost serialization: http://www.boost.org/doc/libs/1_53_0/libs/serialization/doc/index.html[^].

—SA

Quote:

So, what are the ways of saving the objects to files in Windows 8 apps(C#).

Have a look at this Tip:
Windows 8 App - Data storage in files using Windows.Storage namespace[^]

I am getting an Exception:
An exception of type ''System.Runtime.Serialization.InvalidDataContractException'' occurred in System.Runtime.Serialization.dll but was not handled in user code

Additional information: Type ''Windows.UI.Xaml.Media.ImageSource'' cannot be serialized. Consider marking it with the DataContractAttribute attribute, and marking all of its members you want serialized with the DataMemberAttribute attribute. If the type is a collection, consider marking it with the CollectionDataContractAttribute. See the Microsoft .NET Framework documentation for other supported types.

at serializer.WriteObject(stream1, record1)

The class is:

[DataContract(Namespace = "http://www.abcdefg.com")]
    internal class Record
    {
        private double n1;
        private BitmapImage bimg;

        internal Record(double n1, BitmapImage bimg)
        {
            this.n1 = n1;
            this.bimg = bimg;
        }
        [DataMember]
        internal BitmapImage image
        {
            get { return bimg; }
            set { bimg = value; }
        }

        [DataMember]
        internal double OperandNumberOne
        {
            get { return n1; }
            set { n1 = value; }
        }

        public override string ToString()
        {
            return string.Format("Record: {0} and an image: {1}", n1, bimg.ToString());
        }
    }

and the Serialization is done here:

private async void save_Click(object sender, RoutedEventArgs e)
        {
            FileOpenPicker openPicker = new FileOpenPicker();
            openPicker.ViewMode = PickerViewMode.List;
            openPicker.SuggestedStartLocation = PickerLocationId.ComputerFolder;
            openPicker.FileTypeFilter.Add(".jpg");
            StorageFile file = await openPicker.PickSingleFileAsync();
            IRandomAccessStream imageStream = await file.OpenReadAsync();
            bitmapImage = new BitmapImage();
            bitmapImage.SetSource(imageStream);
            ImgUIelement.Source= bitmapImage;

            
            MemoryStream stream1 = new MemoryStream();
            //Serialize the Record object to a memory stream using DataContractSerializer.
            DataContractSerializer serializer = new DataContractSerializer(typeof(Record));
            Record record1 = new Record(1, bitmapImage);
            serializer.WriteObject(stream1, record1);   // EXCEPTION HERE

            tbx_OP.Text = "Written to Stream:" + record1.ToString();

            FileSavePicker fileSavePicker = new FileSavePicker();
            fileSavePicker.DefaultFileExtension = ".bla";
            fileSavePicker.FileTypeChoices.Add("Bla Files", new List<string> { ".bla" });
            fileSavePicker.SuggestedFileName = "New Bla File";
            fileSavePicker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary;
            var sfile = await fileSavePicker.PickSaveFileAsync();

            using (Stream x = await sfile.OpenStreamForWriteAsync())
            {
                x.Seek(0, SeekOrigin.Begin);
                stream1.WriteTo(x);
            }
}
</string>

My requirement is to serialize an object consisting a List of Images and List of StorageFiles into a File, in my Windows Store App. I am trying to find intially whether it is possible to serialize a Single Image.
If possible could anyone please provide the sample code for a class like this..

public class ExClass
{
    List<Image> imgList = new List<Image>();
    List<StorageFile> audList = new List<StorageFile>();
}

I did''nt find any examples for serializing Types other than the Strings,Int,Double..Primitive ones.

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