C# Json.Net 使用不同的“key”参数反序列化 Json

Question

我正在尝试使用 Json.NET 库反序列化 JSON。我收到的 JSON 看起来像：

{
    "responseHeader": {
        "zkConnected": true,
        "status": 0,
        "QTime": 2
    },
    "suggest": {
        "mySuggester": {
            "Ext": {
                "numFound": 10,
                "suggestions": [
                    {
                        "term": "Extra Community",
                        "weight": 127,
                        "payload": ""
                    },
                    {
                        "term": "External Video block",
                        "weight": 40,
                        "payload": ""
                    },
                    {
                        "term": "Migrate Extra",
                        "weight": 9,
                        "payload": ""
                    }
                ]
            }
        }
    }
}

问题是您可以在其中看到的“Ext”是查询字符串中传递的参数的一部分，并且始终不同。我只想获得分配给术语“术语”的值。

我试过这样的事情，但不幸的是不起作用：

public class AutocompleteResultsInfo
{
    public AutocompleteResultsInfo()
    {
        this.Suggest = new Suggest();
    }
    [JsonProperty("suggest")]
    public Suggest Suggest { get; set; }
}

public class Suggest
{
    [JsonProperty("mySuggester")]
    public MySuggesterElement MySuggesterElement { get; set; }
}

public struct MySuggesterElement
{
    public MySuggester MySuggester;
    public string JsonString;

    public static implicit operator MySuggesterElement(MySuggester MySuggester) =>new MySuggesterElement { MySuggester = MySuggester };
    public static implicit operator MySuggesterElement(string String) => new MySuggesterElement { JsonString = String };
}

public class MySuggester
{
    [JsonProperty("suggestions")]
    public Suggestions[] Suggestions { get; set; }
}

public class Suggestions
{
    [JsonProperty("term")]
    public string Autocopmplete { get; set; }
}

internal class SuggesterElementConverter : JsonConverter
{
    public override bool CanConvert(Type t)
    {
        return t == typeof(MySuggesterElement) || t == typeof(MySuggesterElement?);
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        switch (reader.TokenType)
        {
            case JsonToken.String:
            case JsonToken.Date:
                var stringValue = serializer.Deserialize<string>(reader);
                return new MySuggesterElement { JsonString = stringValue };
            case JsonToken.StartObject:
                var objectValue = serializer.Deserialize<MySuggester>(reader);
                return new MySuggesterElement { MySuggester = objectValue };
        }
        throw new Exception("Cannot unmarshal type MySuggesterElement");
    }

    public override void WriteJson(JsonWriter writer, object untypedValue, JsonSerializer serializer)
    {
        var value = (MySuggesterElement)untypedValue;
        if (value.JsonString != null)
        {
            serializer.Serialize(writer, value.JsonString);
            return;
        }
        if (value.MySuggester != null)
        {
            serializer.Serialize(writer, value.MySuggester);
            return;
        }
        throw new Exception("Cannot marshal type CollationElements");
    }

    public static readonly SuggesterElementConverter Singleton = new SuggesterElementConverter();
}

public class AutocompleteConverter
{
    public static readonly JsonSerializerSettings Settings = new JsonSerializerSettings
    {
        MetadataPropertyHandling = MetadataPropertyHandling.Ignore,
        DateParseHandling = DateParseHandling.None,
        Converters =
        {
            SuggesterElementConverter.Singleton
        }
    };
}

var results = JsonConvert.DeserializeObject<AutocompleteResultsInfo>(resultJson, AutocompleteConverter.Settings);

非常感谢您的帮助。

亲切的问候，沃伊切赫

Answer 1

您可以将“mySuggester”解码为字典：public class Suggest

public class Suggest
{
    [JsonProperty("mySuggester")]
    public Dictionary<string, MySuggester> MySuggester { get; set; }
}

然后，您将能够使用查询字符串参数访问建议：

var variablePropertyName = "Ext";

var result = JsonConvert.DeserializeObject<AutocompleteResultsInfo>(_json);

var suggestions = result.Suggest.MySuggester[variablePropertyName].Suggestions;

如果您不知道属性名称，也可以在字典中查找：

var variablePropertyName = result.Suggest.MySuggester.Keys.First();

工作示例：https : //dotnetfiddle.net/GIKwLs