将平面 JSON/Dictionary 映射到模型（包含子类）

Question

我想把一个扁平的json字符串变成一个模型，目标class有子classes，扁平json有所有的子class 有前缀的对象；像“{classname}。{属性}”。

{
    "FirstName": "Joey",
    "LastName": "Billy",
    "EmploymentDetails.JobTitle": "JobTitle",
    "EmploymentDetails.StartDate": "2015-01-01T00:00:00",
    "ContactDetails.HouseNumberName": "10",
    "ContactDetails.Road": "Road"
}

这是我的目的地class:

public class Person {
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public virtual EmploymentDetails EmploymentDetails { get;set;}
    public virtual ContactDetails ContactDetails { get;set;}
}
public class EmploymentDetails {
    public string JobTitle { get; set; }
    public DateTime StartDate { get; set; }
}
public class ContactDetails {
    public string HouseNumberName { get; set; }
    public string Road { get; set; }
}

我尝试了以下方法：

public static void main() {
    var json = @"{""FirstName"": ""Joey"",""LastName"": ""Billy"",""EmploymentDetails.JobTitle"": ""JobTitle"",""EmploymentDetails.StartDate"": ""2015-01-01T00:00:00"",""ContactDetails.HouseNumberName"": ""10"",""ContactDetails.Road"": ""Road"",}";

    //try using AutoMapper
    Mapper.CreateMap<string,Person>();
    var personModel = Mapper.Map<Person>(json);
    //just returns null values

    //try using Newtonsoft
    personModel = Newtonsoft.Json.JsonConvert.DeserializeObject<Person>(json);
    //fills values but obviously returns no nested data
}

我知道 Automapper 有 RecognizePrefix 和 RecognizeDestinationPrefix，但 AutoMapper 似乎只关心它是否在原始对象中，而不关心子对象 class。

可能我可以把我的 JSON 字符串变成一个字典，但即便如此我也不知道如何将它映射到具有子 classes 的模型。

我曾希望我可以拥有无限数量的子 classes 并且 JSON 字符串可以将平面 JSON 模型映射到模型。

Answer 1

您可以制作一个 JsonConverter that does this in a generic way, using a ContractResolver 来分组和填充正在反序列化的 class 或其包含的 class 中的属性（视情况而定）。

你没有要求序列化，只要求反序列化，所以这就是它的作用：

public class JsonFlatteningConverter : JsonConverter
{
    readonly IContractResolver resolver;

    public JsonFlatteningConverter(IContractResolver resolver)
    {
        if (resolver == null)
            throw new ArgumentNullException();
        this.resolver = resolver;
    }

    public override bool CanConvert(Type objectType)
    {
        return resolver.ResolveContract(objectType) is JsonObjectContract;
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        if (reader.TokenType == JsonToken.Null)
            return null;

        JObject jObject = JObject.Load(reader);
        var contract = (JsonObjectContract)resolver.ResolveContract(objectType); // Throw an InvalidCastException if this object does not map to a JObject.

        existingValue = existingValue ?? contract.DefaultCreator();

        if (jObject.Count == 0)
            return existingValue;

        var groups = jObject.Properties().GroupBy(p => p.Name.Contains('.') ? p.Name.Split('.').FirstOrDefault() : null).ToArray();
        foreach (var group in groups)
        {
            if (string.IsNullOrEmpty(group.Key))
            {
                var subObj = new JObject(group);
                using (var subReader = subObj.CreateReader())
                    serializer.Populate(subReader, existingValue);
            }
            else
            {
                var jsonProperty = contract.Properties[group.Key];
                if (jsonProperty == null || !jsonProperty.Writable)
                    continue;
                if (jsonProperty != null)
                {
                    var subObj = new JObject(group.Select(p => new JProperty(p.Name.Substring(group.Key.Length + 1), p.Value)));
                    using (var subReader = subObj.CreateReader())
                    {
                        var propertyValue = serializer.Deserialize(subReader, jsonProperty.PropertyType);
                        jsonProperty.ValueProvider.SetValue(existingValue, propertyValue);
                    }
                }
            }
        }
        return existingValue;
    }

    public override bool CanWrite { get { return false; } }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        throw new NotImplementedException();
    }
}

然后这样使用：

        var resolver = new DefaultContractResolver();
        var settings = new JsonSerializerSettings { ContractResolver = resolver, Converters = new JsonConverter[] { new JsonFlatteningConverter(resolver) } };

        var person = JsonConvert.DeserializeObject<Person>(json, settings);

原型fiddle.

将平面 JSON/Dictionary 映射到模型（包含子类）

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将平面 JSON/Dictionary 映射到模型（包含子 类）

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将平面 JSON/Dictionary 映射到模型（包含子类）