将JSON反序列化为多个继承的类

问题描述

当我从DocumentDB中序列化JSON对象时，我的 Control 不会通过 Options 属性反序列化为 OptionsControl .

When I serialize my JSON object out of DocumentDB, my Control is not deserializing into the OptionsControl with the Options property.

我有以下课程， Control :

public class Control : IControl
{
    public Guid Id { get; set; }

    public virtual Enums.ControlType Type { get; set; }

    public string PropertyName { get; set; }

    public string ControlCssClass { get; set; }

    public string Description { get; set; }
}

我还有 OptionsControl ，它继承自 Control :

public class OptionsControl : Control
{
    public IDictionary<string, string> Options;
}

我还有一个 ClickableControl :

public class ClickableControl : Control
{
    public string Url { get; set; }
    public string UrlTarget { get; set; }
}

我在Azure中使用文档浏览器将此JSON放在DocumentDB 集合的 document 中:

I used the Document Explorer in Azure to put this JSON in document in a DocumentDB collection:

Rows:
[
    {
        Controls:
        [
            {
              "PropertyName": "Relationship",
              "ControlCssClass": "",
              "Description": "",
              "Type": 3,
              "Options": [
                  {
                    "Key": "Spouse",
                    "Value": "Spouse"
                  },
                  {
                    "Key": "Child",
                    "Value": "Child"
                  },
                  {
                    "Key": "Step-child",
                    "Value": "Step-child"
                  }
              ],
           }
        ]
    }
]

当我从DocumentDB中提取数据时，我尝试将其序列化到我的 Row 类中:

When I pull the data out of DocumentDB, I attempt to serialize it into my Row class:

public class Row
{
    public IList<Control> Controls { get; set; }
}

我需要能够将任何类型的控件"放入DocDB的控件列表中，并让C#将列表反序列化为正确的 Control 类(因为基本的 Control类，或类似 OptionsControl 或 ClickableControl 的派生之一).

I need to be able to put any type of "Control" in my Control list in DocDB and have C# deserialize that list back into the proper Control class (be that the base Control class, or one of the derivatives like OptionsControl or ClickableControl).

问题是因为我要反序列化为 Control ，所以我获得了Control上除 Options 以外的所有属性.或者，如果我尝试反序列化具有 Url 和 UrlTarget 的代码，那么我只会获得基本的Control属性，而不是URL属性.我以为C#会处理将反序列化的对象转换为OptionsControl或ClickableControl，但是我想那是不正确的?我该怎么做才能使DocumentDB中的JSON对象正确序列化并变成 OptionsControl (具有Options属性)，而不仅仅是基本Control?

The problem is since I'm deserializing into Control, I get all of the properties on the Control except for Options. Or if I try to deserialize one that has Url and UrlTarget, I just get the base Control properties and not the URL properties. I thought C# would handle turning the deserialized object into an OptionsControl or a ClickableControl, but I guess that is incorrect? What do I need to do so that the JSON object from DocumentDB serializes properly and turns into an OptionsControl (has the Options property) instead of just the base Control?

推荐答案

您可以尝试使用Json.NET自己序列化对象，然后将序列化的内容发布到DocumentDb中.然后，当您需要数据时，将其作为json字符串读回，并再次使用Json.NET进行反序列化.Json.NET可以处理继承，因此您只需配置它即可了解您的类型层次结构.使用TypeNameHandling设置:

You could try serializing your objects yourself with Json.NET and then posting the serialized content into DocumentDb. Then, when you need the data, read it back as a json string and use Json.NET again to deserialize.Json.NET can handle inheritance, so you just have to configure it to be aware of your type hierarchy. Use the TypeNameHandling setting:

http://www.newtonsoft.com/json/help/html/SerializeTypeNameHandling.htm

JsonConvert.DefaultSettings = () => new JsonSerializerSettings
{
    TypeNameHandling = TypeNameHandling.All
};

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