blocks|key|185878|text|我现在已经尝试了你的方案，它工作得很好。但我确实注意到，您的json输入中的id属性后面缺少了一个,+(逗号)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|185879|我通过在我的操作中使用下面的ModelState有效性检查来解决这个问题，然后它会显示我的请求负载中的错误。这也可能对你有用：|185880|if+(!ModelState.IsValid)
{
++++return+Request.CreateErrorResponse(HttpStatusCode.BadRequest,+this.ModelState);
}|code-block|syntax|javascript|185881|entityMap^0|12|2|1D|1|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|U|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

I have tried your scenario now and it works fine. But I did notice that you are missing a <code>,</code> (comma) after the <code>id</code> property in your json input.

I figured this out by using the following ModelState validity check in my action which then showed the error in my request payload. This could be useful to you too:

<pre><code>if (!ModelState.IsValid)
{
 return Request.CreateErrorResponse(HttpStatusCode.BadRequest, this.ModelState);
}
</code></pre>

blocks|key|4691699|text|$type函数必须是对象中的第一个属性。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4691700|在上面的例子中，我做到了：|4691701|+{
+++people:+[{
++++++name:+"Larry",
++++++id:+"123",
++++++badge:+"12345",
++++++$type:+"API.Models.Employee,+API"
+++}]
+}|code-block|syntax|javascript|4691702|将$type移到顶部后，如下所示：|4691703|+{
+++people:+[{
++++++$type:+"API.Models.Employee,+API",
++++++name:+"Larry",
++++++id:+"123",
++++++badge:+"12345"
+++}]
+}|4691704|序列化程序能够将对象反转换为正确的强制转换。一定会喜欢的！|4691705|entityMap^0|0|5|0|0|0|1|5|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|Y|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@]|E|$]]|$1|O|3|P|5|J|7|12|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|13|8|@]|D|@]|E|$]]|$1|S|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|T|$]]

The <code>$type</code> function has to be the first attribute in the object.

In the above example I did:

<pre><code> {
 people: [{
 name: "Larry",
 id: "123",
 badge: "12345",
 $type: "API.Models.Employee, API"
 }]
 }
</code></pre>

after moving <code>$type</code> to the top like:

<pre><code> {
 people: [{
 $type: "API.Models.Employee, API",
 name: "Larry",
 id: "123",
 badge: "12345"
 }]
 }
</code></pre>

the serializer was able to deseralize the object to the correct cast. Gotta love that!

blocks|key|4691745|text|我知道这篇文章已经过时了，答案也已经标注出来了，但我想我的解决方案可能会有所帮助……|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4691746|尝试将JsonProperty属性添加到抽象类的属性中。|4691747|++++using+JTC.Framework.Json;
++++...
++++public+class+People
++++{
++++++++//+other+attributes+removed+for+demonstration+simplicity

++++++++public+List<Person>+People+{+get;set;+}
++++}

++++public+abstract+class+Person
++++{
++++++++++[JsonProperty()]
++++++++++public+string+Id+{get;set;}

++++++++++[JsonProperty()]
++++++++++public+string+Name+{get;set;}
++++}

++++public+class+Employee+:+Person+
++++{
++++++++++public+string+Badge+{get;set;}
++++}

++++public+class+Customer+:+Person
++++{
+++++++++public+string+VendorCategory+{get;set;}
++++}|code-block|syntax|javascript|4691748|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I know this post is old now and the answer has been marked, but I thought my solution might be helpful....

Try adding the JsonProperty attribute to the properties on your abstract class.

<pre><code> using JTC.Framework.Json;
 ...
 public class People
 {
 // other attributes removed for demonstration simplicity

 public List&lt;Person&gt; People { get;set; }
 }

 public abstract class Person
 {
 [JsonProperty()]
 public string Id {get;set;}

 [JsonProperty()]
 public string Name {get;set;}
 }

 public class Employee : Person 
 {
 public string Badge {get;set;}
 }

 public class Customer : Person
 {
 public string VendorCategory {get;set;}
 }
</code></pre>

blocks|key|186000|text|我也遇到过类似的问题。对我来说起作用的是添加一个默认构造函数来初始化您的类中的对象。确保初始化每个对象。在本例中，您需要将构造函数添加到People类。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|186001|public+class+People
{
++public+People()
++{
+++++People+=+new+List<Person>();
++}
++public+List<Person>+People+{+get;set;+}
}|code-block|syntax|javascript|186002|此外，这似乎是一个要么全有要么全无的机会。如果不初始化任何包含的对象，则这些对象都不会包含值。|186003|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I had a very similar issue. What worked for me was to add a default constructor that initializes the objects in your class. Make sure you initialize each object.
In your case, you need to add the constructor to the People class.

<pre><code>public class People
{
 public People()
 {
 People = new List&lt;Person&gt;();
 }
 public List&lt;Person&gt; People { get;set; }
}
</code></pre>

Also, this seems to be an all-or-nothing shot. If you do not initialize any contained objects, none of them will contain values.

I'm implementing a Web API 2 service that uses JSON.NET for serialization. 

When I try to PUT ( deseralize ) updated json data, the abstract class is not present meaning it didn't know what to do with it so it did nothing. I also tried making the class NOT abstract and just inheriting from it and then each PUT deseralized to the base class rather than the derrived class missing the properties of the derrived class.

Example:

<pre><code>public class People
{
 // other attributes removed for demonstration simplicity

 public List&lt;Person&gt; People { get;set; }
}

public abstract class Person
{
 public string Id {get;set;}
 public string Name {get;set;}
}

public class Employee : Person 
{
 public string Badge {get;set;}
}

public class Customer : Person
{
 public string VendorCategory {get;set;}
}
</code></pre>

with my web api configured to do typename handling:

<pre><code>public static void Register(HttpConfiguration config)
{
 config.Formatters.JsonFormatter.SerializerSettings.TypeNameHandling = 
 TypeNameHandling.Objects;
}
</code></pre>

then I PUT the JSON like:

<pre><code>{
 people: [{
 name: "Larry",
 id: "123",
 badge: "12345",
 $type: "API.Models.Employee, API"
 }]
}
</code></pre>

to the web api method:

<pre><code>public HttpResponseMessage Put(string id, [FromBody]People value)
{
 people.Update(value); // MongoDB Repository method ( not important here )
 return Request.CreateResponse(HttpStatusCode.OK);
}
</code></pre>

but the output when inspecting <code>value</code> is always:

<pre><code>People == { People: [] }
</code></pre>

or if non-abstract:

<pre><code>People == { People: [{ Name: "Larry", Id: "123" }] }
</code></pre>

missing the inherrited property. Anyone ran into this problem and come up with anything?

JSON.NET Abstract / Derived Class Deserialization with WebAPI 2

MongoDB

JSON

我正在实现一个使用JSON.NET进行序列化的WebAPI2服务。当我尝试放入(反序列化)更新的json数据时，抽象类不存在，这意味着它不知道如何处理它，所以它什么也不做。我还试着让类不是抽象的，只是继承它，然后每个PUT都应该放到基类，而不是derrived类，缺少derrived类的属性。示例：public cla...

问使用WebAPI 2进行JSON.NET抽象/派生类反序列化
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