.net json 处理

处理较复杂的Json字符串，不需要对Json进行序列化操作，以下是一种非常简单的方法，记录以下；

Json字符串如下：

{
	"code": 0,
	"msg": "SUCCESS",
	"result": [{
		"changesContent": [{
			"unionNo": "1719708390162472960",
			"orderDeliveredList": [{
				"expName": "普通快递",
				"expNo": "333",
				"packageList": [{
					"deliveredNum": 1,
					"deliveredTime": "2023-11-01 21:31:04",
					"orderDetailId": 3566376
				}],
				"suborderId": 3366323,
				"expCode": "XUNI"
			}]
		}, {
			"unionNo": "1719706286249254912",
			"orderDeliveredList": [{
				"expName": "速必达物流",
				"expNo": "111",
				"packageList": [{
					"deliveredNum": 2,
					"deliveredTime": "2023-11-01 21:31:10",
					"orderDetailId": 3566375
				}],
				"suborderId": 3366322,
				"expCode": "SUBIDA"
			}]
		}],
		"eventDesc": "订单发货通知",
		"eventKey": "ORDER_DELIVERY"
	}],
	"traceId": "7c2aca0b-5108236"
}

　　使用JObject类来处理，代码如下：

 string orderNum = string.Empty;
            string jsonStr = @"{ ""code"":0, ""msg"":""SUCCESS"", ""result"":[ { ""changesContent"":[ { ""unionNo"":""1719708390162472960"", ""orderDeliveredList"":[ { ""expName"":""普通快递"", ""expNo"":""333"", ""packageList"":[ { ""deliveredNum"":1, ""deliveredTime"":""2023-11-01 21:31:04"", ""orderDetailId"":3566376 } ], ""suborderId"":3366323, ""expCode"":""XUNI"" } ] }, { ""unionNo"":""1719706286249254912"", ""orderDeliveredList"":[ { ""expName"":""速必达物流"", ""expNo"":""111"", ""packageList"":[ { ""deliveredNum"":2, ""deliveredTime"":""2023-11-01 21:31:10"", ""orderDetailId"":3566375 } ], ""suborderId"":3366322, ""expCode"":""SUBIDA"" } ] } ], ""eventDesc"":""订单发货通知"", ""eventKey"":""ORDER_DELIVERY"" } ], ""traceId"":""7c2aca0b-5108236"" }";
            JObject jsonObjectStr = JObject.Parse(jsonStr);

            JToken[] resultArr = jsonObjectStr.GetValue("result").ToArray();

            if(resultArr.Length>0)
            {
                var result = jsonObjectStr.SelectTokens("result[*].changesContent[*].unionNo").Select(a => a.Value<string>()).ToList();//存在多个unionNo的写法
　　　　　　　　　 //var jsonObjectStr.SelectTokens("result.unionNo").Select(a => a.Value<string>()).FirstOrDefault().ToString();//存在单个unionNo的写法
                foreach(string item in result)
                {
                    orderNum = item;
                }
            }