DataContractSerializer 的问题 [英] Trouble with DataContractSerializer

问题描述

我正在尝试让 DataContract Serializer 与我的一个班级一起工作.

I'm trying to make DataContract Serializer work with one of my class.

这里是:

public class MyOwnObservableCollection<T> : ObservableCollection<T>, IDisposable
    where T : IObjectWithChangeTracker, INotifyPropertyChanged
{
    protected List<T> removedItems;

    [DataMember]
    public List<T> RemovedItems 
    {
    get { return this.removedItems;} 
    set { this.removedItems = value;}
    }
    // Other code removed for simplification
    // ...
    //
}

当您从 ObservableCollection 中删除项目时，RemovedItems 列表会自动填充，了解这一点很重要.

It is important to understand that the RemovedItems list gets populated automatically when you remove an Item from the ObservableCollection.

现在使用 DataContractSerializer 序列化这个类的一个实例，其中一个元素位于removedItems 列表中，代码如下:

Now serializing an instance of this class using the DataContractSerializer with one element in the removedItems list with the following code :

MyOwnObservableCollection<Test> _Test = new MyOwnObservableCollection<Test>();
DataContractSerializer dcs = new DataContractSerializer(typeof(MyOwnObservableCollection<Test>));
XmlWriterSettings settings = new XmlWriterSettings() { Indent = true };
string fileName = @"Test.xml";

Insurance atest = new Test();
atest.Name = @"sfdsfsdfsff";
_Test.Add(atest);
_Test.RemoveAt(0); // The Iitem in the ObservableCollection is moved to the RemovedItems List/
using (var w = XmlWriter.Create(fileName, settings))
{
    dcs.WriteObject(w, _Test);
}

以 XML 文件中的任何内容结尾:

ends with nothing in the XML file :

<?xml version="1.0" encoding="utf-8"?>
<ArrayOfTest xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="MyNameSpace" />

为什么忽略这个公共属性?我在这里错过了什么?

Why is this public property ignored ? What have I missed here ?

TIA.

推荐答案

这里的问题是你的类是从一个集合派生的，因此，DataContractSerializer 只序列化它的项目，而不是任何额外的属性，如下所述:否使用 CollectionDataContract 时的属性.

The problem here is that your class is derived from a collection, and as such, the DataContractSerializer serializes only its items, but not any extra properties, as stated here: No properties when using CollectionDataContract.

一种解决方法是使用原始(继承的)集合作为属性，而不是从它继承:

A workaround would be using the original (inherited) collection as a property, rather than inheriting from it:

public class MyOwnObservableCollection<T> : IDisposable
    where T : IObjectWithChangeTracker, INotifyPropertyChanged
{
   readonly ObservableCollection<T> originalCollection = new ObservableCollection<T>();
   protected List<T> removedItems = = new List<T>();

   [DataMember]
   public List<T> RemovedItems 
   {
      get { return this.removedItems;} 
      set { this.removedItems = value;}
   }

   [DataMember]
   public ObservableCollection<T> OriginalCollection  
   {
      get { return this.originalCollection; }
   }

   // ...
}

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