在 Stack Overflow 上可能有 500 个类似的问题,还有无数网站提供信息 - 但我只是看不清楚。这似乎应该是非常简单的操作,但我就是做不到。
我有一个返回序列化 JSON 对象的 WCF Web 服务:
[OperationContract(Name = "PeopleData"), WebGet(BodyStyle = WebMessageBodyStyle.Bare, UriTemplate = "people/{subset}", ResponseFormat = WebMessageFormat.Json)]
PeopleObject GetPeople(string subset);
这个有效——如果我在浏览器中输入该URI,将调用GetPeople并返回一个JSON序列化的PeopleObject
(这里为了隐私而实际数据值被省略):
{"HashValue":"XXXXX","People":[{"EmailAddress":"XXXXX","EmployeeID":99999,"Gender":"X","JobTitle":"XXXXX","Office":"","PreferredName":"XXXXX","Surname":"XXXXX","WorkExtensionNumber":"XXXXX","WorkPhoneNumber":"XXXXX","Department":"XXXXX","DeskNumber":"XXXXX","EmploymentClassification":"XXXXX","InternationalExtensionNumber":"XXXXX","IsFirstAider":false,"Languages":[{"LanguageID":9,"LanguageSkillID":9},{"LanguageID":9,"LanguageSkillID":9}],"QualificationInitials":"XXXXX","QualificationTitle":"XXXXX","Secretaries":null,"WorkMobilePhoneNumber":"XXXXX"}],"RecordCount":"1","SizeBytes":"12345"}
在这个例子中,
PeopleObject
负载只包含一个Person
对象在集合中,但根据/{subset}
中提供的参数,可能包含许多对象。下面是
PeopleObject
的类层次结构 - 它是一个顶级容器,包含有关负载的一些元数据,以及Person
对象的List<>。这些对象又有一堆简单类型属性,以及两个进一步嵌套的List<>,其中包含Language
和Secretary
对象(可能填充或未填充): [DataContract]
public class PeopleObject
{
[DataMember]
public string HashValue { get; set; }
[DataMember]
public List<Person> People { get; set; }
[DataMember]
public string RecordCount { get; set; }
[DataMember]
public string SizeBytes { get; set; }
}
[DataContract]
public class Person
{
[DataMember]
public string EmailAddress { get; set; }
// <-- snip - lots of fields like this, no point listing them all here
[DataMember]
public bool IsFirstAider { get; set; }
[DataMember]
public List<Language> Languages { get; set; }
[DataMember]
public List<Secretary> Secretaries { get; set; }
}
[DataContract]
public class Language
{
[DataMember]
public int LanguageID { get; set; }
[DataMember]
public int LanguageSkillID { get; set; }
}
[DataContract]
public class Secretary
{
[DataMember]
public int EmployeeID { get; set; }
[DataMember]
public char FirstSurnameLetter { get; set; }
}
目前为止,WCF以JSON结构响应并包含所有字段及其内容。现在需要在客户端应用程序中反序列化该结构(使用相同的类层次结构定义):
// I have a little helper-class to manage the WCF request and return a Stream
using (Stream response = wcfHelper.GetRequestResponseStream(MY_WCF_URI))
{
// This is debug code to prove the response arrives as expected - it does
//StreamReader sr = new StreamReader(response);
//Console.WriteLine("\nResponse:\n{0}", sr.ReadToEnd());
// Deserialise the response
DataContractJsonSerializer dc = new DataContractJsonSerializer(typeof(PeopleObject));
PeopleObject p = (PeopleObject)dc.ReadObject(response);
// The object shows 1 record (in the example) but nothing in the List<>
Console.WriteLine("\nDeserialized records: '{0}' [{1}]", p.RecordCount, p.People.Count);
}
这样做可以正确反序列化容器对象,以给出记录计数、哈希值和有效载荷大小(以字节为单位)。该对象还具有一个Person对象的List<>,但它是null——来自JSON响应的内容未能通过创建和添加Person对象成功地重新生成List<>。
我错过了什么?我的理解是,从JSON结构中重新生成C#对象层次结构应该自动发生,所以要么不是这种情况(我需要编写一些代码使其发生),要么就是,但我错过了一些显而易见的东西。
List<T>
这样的可枚举类型。 - Chris Sinclair