我有一个WCF REST服务接受一个自定义的DataContract参数作为JSON,可以是超类型或子类型。当我传递包含额外空白的JSON时,对象总是反序列化为超类型。当我从JSON中删除所有空白时,对象将作为子类型进行反序列化。WCF JSON反序列化问题与空白
下面是一个例子:
[DataContract]
[KnownType(typeof(SubClass))]
public class SuperClass
{
[DataMember]
public string Message { get; set; }
}
[DataContract]
public class SubClass : SuperClass
{
[DataMember]
public string Extra { get; set; }
}
[ServiceContract]
public interface IService1
{
[OperationContract]
[WebInvoke]
void LogMessage(SuperClass arg);
}
public class Service1 : IService1
{
public void LogMessage(SuperClass arg)
{
if (arg is SubClass)
{
Debug.WriteLine("SubClass");
}
else if (arg is SuperClass)
{
Debug.WriteLine("SuperClass");
}
}
}
如果我发送如下信息,该服务将打印SuperClass
:
POST http://localhost:5763/Service1.svc/LogMessage HTTP/1.1
User-Agent: Fiddler
Content-Type: text/json
Host: localhost:5763
Content-Length: 86
{ "__type":"SubClass:#WhitespaceTest", "Message":"Message", "Extra":"Extra" }
我得到同样的结果,如果我“漂亮打印”的数据包作为以便JSOn分成多行。然而,服务将打印如果我剥离空格如下:
POST http://localhost:5763/Service1.svc/LogMessage HTTP/1.1
User-Agent: Fiddler
Content-Type: text/json
Host: localhost:5763
Content-Length: 73
{"__type":"SubClass:#WhitespaceTest","Message":"Message","Extra":"Extra"}
我已经调试的System.ServiceModel.OperationContext.Current.RequestContext.RequestMessage.ToString()
输出,并注意到从JSON生成的XML是2个分组之间不同:
<!-- First packet, deserializes to SuperClass -->
<root type="object">
<__type type="string">SubClass:#WhitespaceTest</__type>
<Message type="string">Message</Message>
<Extra type="string">Extra</Extra>
</root>
<!-- Second packet, deserializes to SubClass -->
<root type="object" __type="SubClass:#WhitespaceTest">
<Message type="string">Message</Message>
<Extra type="string">Extra</Extra>
</root>
所以,似乎空白混淆了JSON解串器。有谁知道为什么会发生这种情况,我能做些什么呢?
谢谢。有没有来自Microsoft的知识库文章,这是一个错误? – Imran 2016-03-24 20:07:31