如何检查 JSON 响应中的嵌套对象列表是否为空？

Question

我有一个 JSON 我从

得到的

var responseMessage1 = await request1.Content.ReadAsStringAsync();

看起来像这样：-

{
    "operations": [
        {
            "creationTime": "2022-06-02T10:28:28.765+03:00",
            "deviceId": "43432103",
            "deviceName": "P25-SC-0228",
            "status": "PENDING",
            "com_cumulocity_model": {
                "op": "s",
                "param": "waterStartDateTime",
                "value": "1/2/2018, 7:30:00 AM"
            },
            "description": "Generate Plan"
        },
        {
            "creationTime": "2022-06-02T10:28:36.276+03:00",
            "deviceId": "43432103",
            "deviceName": "P25-SC-0228",
            "status": "PENDING",
            "com_cumulocity_model": {
                "Mode": 0,
                "StopStationPayload": "[{\"ControllerAddress\":11,\"StationAddress\":26}]"
            },
            "description": "Stop Station"
        }
    ],
    "statistics": {
        "currentPage": 1,
        "pageSize": 5
    }
}

我想要实现的是检查 json 中的操作列表是否为空的条件，其中 json 可能如下所示：-

{
    "operations": [],
    "statistics": {
        "currentPage": 1,
        "pageSize": 1
    }
}

我想执行类似

的操作

if(responseMessage1["operations"] != null){
//do something
}

Answer 1

您可以使用 JToken 的 HasValues 属性进行分支

if (json["operations"].HasValues)

如何检查 JSON 响应中的嵌套对象列表是否为空？

How to check if a nested list of objects inside a JSON response is empty or not?

c#

json

.net

json.net