DataContractJsonSerializer 的反序列化问题 [英] Deserialization problem with DataContractJsonSerializer

问题描述

我有以下 JSON 片段:

I've got the following piece of JSON:

[{
    "name": "numToRetrieve",
    "value": "3",
    "label": "Number of items to retrieve:",
    "items": {
        "1": "1",
        "3": "3",
        "5": "5"
    },
    "rules": {
        "range": "1-2"
    }
},
{
    "name": "showFoo",
    "value": "on",
    "label": "Show foo?"
},
{
    "name": "title",
    "value": "Foo",
    "label": "Foo:"
}]

单行版本(适用于字符串文字):

All in one line version (suitable for a string literal):

[{"name":"numToRetrieve","value":"3","label":"Number of items to retrieve:","items":{"1":"1","3":"3","5":"5"},"rules":{"range":"1-2"}},{"name":"showFoo","value":"on","label":"Show foo?"},{"name":"title","value":"Foo","label":"Foo:"}]

在上面的例子中，name、value 和 label 是必需的，但 items 和 规则是可选的.

In the above example, name, value, and label are required but items and rules are optional.

这是我要反序列化的类:

Here's the class I'm trying to deserialize into:

using System.Collections;
using System.Collections.Generic;
using System.Runtime.Serialization;

namespace foofoo
{
    [DataContract]
    public sealed class FooDef
    {
        [DataMember(Name = "name", IsRequired = true)]
        public string Name { get; set; }

        [DataMember(Name = "value", IsRequired = true)]
        public string Value { get; set; }

        [DataMember(Name = "label", IsRequired = true)]
        public string Label { get; set; }

        [DataMember(Name = "items", IsRequired = false)]
        public Dictionary<string, string> Items { get; set; }

        [DataMember(Name = "rules", IsRequired = false)]
        public Dictionary<string, string> Rules { get; set; }
    }
}

这是我用来反序列化的代码:

Here's the code I use to deserialize:

var json = new DataContractJsonSerializer(typeof(List<FooDef>));
var bar = "[{"name":"numToRetrieve","value":"3","label":"Number of items to retrieve:","items":{"1":"1","3":"3","5":"5"},"rules":{"range":"1-2"}},{"name":"showFoo","value":"on","label":"Show foo?"},{"name":"title","value":"Foo","label":"Foo:"}]";
var stream = new MemoryStream(Encoding.UTF8.GetBytes(bar));
var foo = json.ReadObject(stream);
stream.Close();

除了第一遍 FooDef 的 items 和 rules 为空外，一切都进行得相当顺利.我已经尝试了所有方法来尝试填充它们:自定义类、NameValueCollection、KeyValuePair、List后者，以及似乎适用的所有其他集合.

Everything goes reasonably well except that items and rules are empty for the first FooDef pass. I have tried everything under the sun to try and get them populated: custom classes, NameValueCollection, KeyValuePair<string, string>, List of both of the latter, and every other collection that seemed to apply.

在我看来，问题在于items 和rules 下的关键部分是开放式的.也就是说，它并不总是被称为 range 或 3.有什么建议或想法吗?

The problem, as I see it, is that the key piece under items and rules is open-ended. That is, it's not always going to be called range or 3. Any advice or ideas?

推荐答案

恕我直言，无法使用 DataContractJsonSerializer 将您提供的 JSON 字符串反序列化为 .NET 类.

IMHO there is no way to deserialize the JSON string you provided into a .NET class using DataContractJsonSerializer.

问题来自DataContractJsonSerializer 序列化字典的方式.您可以使用替代序列化程序，例如 Json.NET(我强烈推荐)或 JavaScriptSerializer(我认为是不推荐使用 DataContractJsonSerializer 但它适用于您的场景).

The problem comes from the way DataContractJsonSerializer serializes dictionaries. You could use an alternative serializer such as Json.NET (which I strongly recommend) or JavaScriptSerializer (I think it was deprecated in favor of DataContractJsonSerializer but it will work for your scenario).

您还可以阅读这些咆哮.

文档:序列化集合 - Json.NET

Documentation: Serializing Collections - Json.NET

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