c#NewtonJson Jarray检查空/空错误

如何检查json数组是否为null或emty

Json:

    {
          "productList": [
            {
              "id": 2440,
              "serviceStatus": 1,
              "listOfBillProductsExtras": [
                {
                  "id": 2441,
                  "amount": 1,
                  "balance": 2,
                }
                                         ],
               "deskName": "Desk 1",
               "onlyTime": "15:25"
            },
            {
              "id": 2441,
              "serviceStatus": 1,
              "listOfBillProductsExtras": [ ],
               "deskName": "Desk2",
               "onlyTime": "15:27"
            }
     ]
  }

我试着

---

但它不起作用。（有exp.Null引用）所以，我想检查一下BillProductsExtras数组的列表是否为Null或为空。如果不为空，我将获得id、金额和余额

将Json对象解析为jArray：

  public ActionResult Method(object[] data)
  {
        var productList = Json.ParseJsonObjectToJArray(data, "productList");

        if(jArray.Count > 0)
        {

        }
    }

    public class Json
    {
        public static JArray ParseJsonObjectToJArray(object[] data, string objectName)
        {
             dynamic jObject = JObject.Parse(data[0].ToString());
             var info = jObject[objectName];

             return info;
        }
   }

这应该行得通

var found = JObject.Parse(json).SelectToken("productList[0].listOfBillProductsExtras[0].id");

其中json是您的输入字符串。 可以检查找到的变量是否为空值

var found = JObject.Parse(json).SelectToken("productList[0].listOfBillProductsExtras[0].id");