如何将JSON对象提升为数组?

问题描述 投票:0回答:1

是否有可能将json文档的特定部分“提升”为数组?

例如,输入将是这样的:

{
   "identifier": {"a":"awesome", "b":"back", "c":"cat"}
}

假设我想推广c,在伪代码中,我们会做类似的事情:

var payload = "{\"identifier\": {\"a\":\"awesome\", \"b\":\"back\", \"c\":\"cat\"}}";
var payloadWithPromotedC = Promoter.ToArray(payload, "identifier.c");

结果将是这样的:

{
   "identifier": {"a":"awesome", "b":"back", "c":["cat"]}
}

我们如何将json文档中的某个节点声明地推广到数组中?

c# .net json
1个回答
1
投票

我不确定你的意思是“声明性地”,但是按照你的例子,你可以使用Json.Net做这样的事情:

public class Promoter
{
    public static string ToArray(string json, string propertyPath)
    {
        JToken root = JToken.Parse(json);
        JToken tokenToPromote = root.SelectToken(propertyPath);
        if (tokenToPromote == null)
        {
            throw new JsonException(propertyPath + " was not found");
        }
        if (tokenToPromote.Type == JTokenType.Array)
        {
            return json;  // value is already an array so return the original JSON
        }
        tokenToPromote.Replace(new JArray(tokenToPromote));
        return root.ToString(Formatting.None);
    }
}

工作演示:https://dotnetfiddle.net/bOUOWD

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