c# DataContractSerializer 继承

Question

当使用 DataContractSerializer 反序列化 XML 时，我遇到了基类序列的问题。没有派生类从 XML 中反序列化:

<?xml version="1.0" encoding="utf-8" ?>

<Page xmlns="Renishaw.Page">
  <Fields>
    <Field Value="Welcome"/>
    <LanguageField Value="English"/>
  </Fields>

  <Buttons>
    <CancelButton/>
    <BackButton/>
    <NextButton/>
  </Buttons>

  <ChildPath>D:\SerializeTest\Console\bin\Debug\XML\Content\Next\Next\Page.xml</ChildPath>
</Page>

以下是我的DataContract:

[DataContract(Namespace = "Renishaw.Page")]
internal class Page
{
    [DataMember(Order=1, IsRequired = true)]
    public List<Field> Fields { get; set; }

    [DataMember(Order = 2, IsRequired = true)]
    public List<Button> Buttons { get; set; }

    [IgnoreDataMember]
    public Page Child { get; set; }

    [DataMember(Order = 3, IsRequired = true)]
    private string ChildPath { get; set; }

    [OnDeserialized]
    private void OnDeserialized(StreamingContext context)
    {
        if (ChildPath.Equals(""))
            return;

        Child = Serializer.Deserialize<Page>(ChildPath);
    }

    [OnSerialized]
    private void OnSerialized(StreamingContext context)
    {

    }
}

[DataContract]
[KnownType(typeof(LanguageField))]
internal class Field
{
    [DataMember(Order=1)]
    public string Value { get; set; }
}

[DataContract]
internal class LanguageField : Field
{

}

[DataContract]
[KnownType(typeof(BackButton))]
[KnownType(typeof(CancelButton))]
[KnownType(typeof(NextButton))]
internal class Button
{

}

[DataContract]
internal class BackButton : Button
{

}

[DataContract]
internal class CancelButton : Button
{

}

[DataContract]
internal class NextButton : Button
{

}

我到底哪里错了？是否有特定的方式需要为继承的项目声明契约(Contract)？

Answer 1

您应该将 DataContract 名称添加到 Button，如下所示

[DataContract(Name="ThisIsButton")]
[KnownType(typeof(BackButton))]
[KnownType(typeof(CancelButton))]
[KnownType(typeof(NextButton))]
internal class Button
{

}

然后在你的xml中添加type

  <Buttons>
    <CancelButton itype="ThisIsButton"/>
    <BackButton itype="ThisIsButton"/>
    <NextButton itype="ThisIsButton"/>
  </Buttons>