我在datacontract上有一个knowntype属性,并且不知道如何修改xml以接受这些知识类型

时间:2014-06-02 14:34:37

标签: c# xml wcf datacontractserializer

Datacontract示例

[DataContract(Namespace = "namespace")]
[KnownType(typeof(KnownType1))]
public class DataContract
{
    [DataMember(IsRequired = true)]
    public int Value;
}

如何编写xml以使用KnownType1代替DataContract。我已经尝试过:(我已经忽略了名称空间和所有额外的东西来简化这个例子)

<DataContract> 
      <Value> 1</Value>
      <KnownType1> ....</KnownType>
</DataContract>

我也尝试用KnownType1替换DataContract节点,但我认为这也不正确。

1 个答案:

答案 0 :(得分:1)

例如,我们遵循DTO:

[DataContract(Namespace = "namespace")]
[KnownType(typeof(KnownType1))]
public class DataContract
{
    [DataMember(IsRequired = true)]
    public int Value;
}

[DataContract(Namespace = "namespace1")]
public sealed class KnownType1 : DataContract
{
    [DataMember(IsRequired = true)]
    public int Value1;
}

为简单起见(我用XmlTextWriter(Console.Out)打印结果xml),序列化函数如下:

private void Serialize<T>(object value)
{
    XmlObjectSerializer serializer = new DataContractSerializer(typeof(T));
    var writer = new XmlTextWriter(Console.Out)
    {
        Formatting = Formatting.Indented
    };
    serializer.WriteObject(writer, value);
}

这是序列化:

[Fact]
public void Test()
{
    Serialize<DataContract>(new KnownType1 { Value = 1, Value1 = 2 });

    Serialize<DataContract>(new DataContract { Value = 1 });
}

结果输出:

<DataContract xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns:d1p1="namespace1" i:type="d1p1:KnownType1" xmlns="namespace">
  <Value>1</Value>
  <d1p1:Value1>2</d1p1:Value1>
</DataContract>

<DataContract xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="namespace">
  <Value>1</Value>
</DataContract>

如您所见,KnownType1 xml包含其他i:type="d1p1:KnownType1"