JsonConvert DeserializeObject区分大小写

101

罗莫诺夫

我正在尝试将字符串内容反序列化为对象，但是我希望内容区分大小写。仅当字符串具有小写字母属性时，代码才应成功；如果字符串具有大写字母属性，则代码应失败。以下是课程：

internal class ResponseList
{
    [DataMember]
    [JsonProperty]
    internal List<Response> Value { get; set; }
}

internal class Response
{
    [DataMember]
    [JsonProperty]
    internal string Id { get; set; }

    [DataMember]
    [JsonProperty]
    internal string Location { get; set; }

    [DataMember]
    [JsonProperty]
    internal PlanClass Plan { get; set; }
}

internal class PlanClass
{
    [DataMember]
    [JsonProperty]
    internal string Name { get; set; }

    [DataMember]
    [JsonProperty]
    internal string Product { get; set; }

    [DataMember]
    [JsonProperty]
    internal string Publisher { get; set; }
}

以下是我的代码。但这不区分大小写。大写和小写都成功：

string content = File.ReadAllText(contentFilePath);
JsonSerializerSettings jsonSerializerSettings1 = new JsonSerializerSettings()
{
    ContractResolver = new CamelCasePropertyNamesContractResolver()
};
ResponseList response = (ResponseList)JsonConvert.DeserializeObject(contentResourceOutput, typeof(ResponseList), Constants.JsonSerializerSettings);

仅当内容为：

{
  "value": [
    {
      "id": "id1",
      "location": "location1",
      "plan": {
        "name": "free",
        "product": "product1",
        "publisher": "publisher1"
      }
    }
    ]
}

即使其中一个键是大写字母，也会失败。例如

{
  "value": [
    {
      "Id": "id1",
      "Location": "location1",
      "plan": {
        "Name": "free",
        "product": "product1",
        "publisher": "publisher1"
      }
    }
    ]
}

请注意，只有键/属性名称应为小写。这些值可以是大写的。有没有办法使JsonConvert.Deserializeobject区分大小写？

大卫·L

您可以编写一个自定义转换器来处理此用例。关于您需要对所有键名进行递归检查的问题，我在这里使用了ThymineWalkNode给出的绝妙答案。

var json = @"{""id"": ""id1"",""name"": ""name1"",""type"": ""type1""}";
var json2 = @"{""id"": ""id1"",""Name"": ""name1"",""type"": ""type1""}";

JsonSerializerSettings settings = new JsonSerializerSettings()
{
    ContractResolver = new CamelCasePropertyNamesContractResolver(),
    Converters = new List<JsonConverter> { new CamelCaseOnlyConverter() }
};

var response = JsonConvert.DeserializeObject<Response>(json, settings);
var response2 = JsonConvert.DeserializeObject<Response>(json2, settings);

public class CamelCaseOnlyConverter : JsonConverter
{
    public override bool CanConvert(Type objectType)
    {
        return true;
    }

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

        var token = (JObject)JToken.Load(reader);

        var isCamelCased = true;
        WalkNode(token, null,
        t =>
        {
            var nameFirstChar = t.Name[0].ToString();
            if (!nameFirstChar.Equals(nameFirstChar.ToLower(), 
                StringComparison.CurrentCulture))
            {
                isCamelCased = false;
                return;
            }
        });

        if (!isCamelCased) return null;

        return token.ToObject(objectType);
    }

    public override void WriteJson(JsonWriter writer, object value, 
        JsonSerializer serializer)
    {
        JObject o = (JObject)JToken.FromObject(value);
        o.WriteTo(writer);
    }

    private static void WalkNode(JToken node,
                            Action<JObject> objectAction = null,
                            Action<JProperty> propertyAction = null)
    { 
        if (node.Type == JTokenType.Object)
        {
            if (objectAction != null) objectAction((JObject)node);
            foreach (JProperty child in node.Children<JProperty>())
            {
                if (propertyAction != null) propertyAction(child);
                WalkNode(child.Value, objectAction, propertyAction);
            }
        }
        else if (node.Type == JTokenType.Array)
            foreach (JToken child in node.Children())
                WalkNode(child, objectAction, propertyAction);
    }
}

第一个字符串将返回一个水合对象。第二个字符串将提前终止，返回null。

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