Public ViewModel 的 IDictionary 成员 class 不会通过 DataContractSerializer 进行序列化

Question

我有一个 class，这是我的 windows 8.1 通用应用程序的视图模型。我希望能够根据需要序列化/反序列化此 class。除了 IDictionary public 属性，我有这个工作。此属性被跳过。当我明确告诉 DataContractSerializer 自行序列化时，它按预期工作。

为什么在序列化视图模型 class 时它没有被 DataContractSerializer 拾取？当我直接序列化 DataDictionary 时，您会看到我已经解决了所有 KnowType 问题。

这是有问题的class

[KnownType( typeof( ViewModel ) )]
public class AViewModel : ViewModelBase
{
      public ViewModel()
      {
         DataDictionary = new Dictionary<double, IData>();
         SaveCommand = new RelayCommand( () => Save() );
         LoadCommand = new RelayCommand( () => Load() );
      }

      private string _firstName;
      public string FirstName { get { return _firstName; } set { Set( () => FirstName, ref _firstName, value ); } }

      private string _lastName;
      public string LastName { get { return _lastName; } set { Set( () => LastName, ref _lastName, value ); } }

      private IDictionary<double, IData> _dataDictionary;
      public IDictionary<double, IData> DataDictionary { get { return _dataDictionary; } private set { _dataDictionary = value; } }

      public ICommand SaveCommand { get; private set; }
      public ICommand LoadCommand { get; private set; }

      private async void Save()
      {
        //logic will go here, example in unit test below
      }
}

这是与 IData

相关的子 classes

public interface IData
{
   string Type { get; set; }
}

[KnownType( typeof( BlueData ) )]
public class BlueData : IData
{
   public string String1 { get; set; }
   public string Type { get; set; }
}

[KnownType( typeof( GreenData ) )]
public class GreenData : IData
{
   public string Type { get; set; }
   public string String1 { get; set; }
}

这是我用来构建序列化的代码

ViewModel model = new ViewModel();
model.FirstName = "First";
model.LastName = "Last";
model.DataDictionary.Add( 1.2, new BlueData { String1 = "TestBlueData", Type = "BlueData" } );

MemoryStream memoryStream = new MemoryStream();
DataContractSerializer serializer = new DataContractSerializer( typeof( ViewModel ) );
serializer.WriteObject( memoryStream, model );

memoryStream.Seek( 0, SeekOrigin.Begin );

string xml;
using ( StreamReader reader = new StreamReader( memoryStream ) )
{
    xml = reader.ReadToEnd();
}

这是我从上面的代码中得到的 xml 输出

<ViewModel xmlns="http://schemas.datacontract.org/2004/07/ApplicationNamespace.ViewModel" xmlns:i="http://www.w3.org/2001/XMLSchema-instance"><FirstName>First</FirstName><LastName>Last</LastName></ViewModel>

当我直接在 model.DataDictionary 上调用 DataContractSerializer 时，我得到以下内容

<ArrayOfKeyValueOfdoubleanyType xmlns="http://schemas.microsoft.com/2003/10/Serialization/Arrays" xmlns:i="http://www.w3.org/2001/XMLSchema-instance"><KeyValueOfdoubleanyType><Key>1.2</Key><Value i:type="a:BlueData" xmlns:a="http://schemas.datacontract.org/2004/07/ApplicationNamespace"><a:String1>TestBlueData</a:String1><a:Type>BlueData</a:Type></Value></KeyValueOfdoubleanyType></ArrayOfKeyValueOfdoubleanyType>

Answer 1

如果您将 DataDictionary 属性的 setter 从 'private' 更改为 'public'，那么它应该会按预期工作

Public ViewModel 的 IDictionary 成员 class 不会通过 DataContractSerializer 进行序列化

Public IDictionary member of ViewModel class will not serialize via DataContractSerializer

c#

datacontractserializer

windows-store-apps