Question

{
   "itemlist":{
      "appid":"ST_UWL",
      "transid":"STAT_ID_7001",
      "overalltransstatus":"O",
      "translastmodifieddate":"04.FEB.2016 00:00:00",
      "requestor":{
         "no":"296111",
         "name":"Sowmya Rao",
         "adid":"SO29"
      },
      "workflow":[
         {
            "no":"296",
            "name":"Sowmya Rao",
            "adid":"SO296",
            "level":"",
            "leveltext":"Employee"
         },
         {
            "no":"813",
            "name":"Swaroop",
            "adid":"SSIV",
            "level":"2",
            "leveltext":"Supervisor"
         }
      ],

   }
}

我有一个上面格式的Json字符串。我必须创建一个控制台应用程序，我必须用新单词和其他新增内容替换字符串中的某些关键字。我试图反序列化，但更不能从数组中选择关键字。它给出了错误

＆＃34;无法将带有[]的索引应用于类型为＆＃39; System.Array＆＃39;的表达式。用C＃＆＃34;。

Answer 1

尝试使用JsonConvert而不是JavaScriptSerializer反序列化。您需要添加Newtonsoft.Json nuget包并引用它。以下代码将您的字符串反序列化为动态对象，使用该对象可以访问项目的所有属性：

        dynamic json = JsonConvert.DeserializeObject<dynamic>(str);
        var firstWorkflow = json.itemlist.workflow[0]);

Answer 2

要获取工作流程，您必须将项目列表转换为Dictionary<string,object类型，然后再次为您的密钥编制该项目的索引，在本例中为workflow

        public void ParseJson()
        {
            string json =
                "{\r\n   \"itemlist\":{\r\n      \"appid\":\"ST_UWL\",\r\n      \"transid\":\"STAT_ID_7001\",\r\n      \"overalltransstatus\":\"O\",\r\n      \"translastmodifieddate\":\"04.FEB.2016 00:00:00\",\r\n      \"requestor\":{\r\n         \"no\":\"296111\",\r\n         \"name\":\"Sowmya Rao\",\r\n         \"adid\":\"SO29\"\r\n      },\r\n      \"workflow\":[\r\n         {\r\n            \"no\":\"296\",\r\n            \"name\":\"Sowmya Rao\",\r\n            \"adid\":\"SO296\",\r\n            \"level\":\"\",\r\n            \"leveltext\":\"Employee\"\r\n         },\r\n         {\r\n            \"no\":\"813\",\r\n            \"name\":\"Swaroop\",\r\n            \"adid\":\"SSIV\",\r\n            \"level\":\"2\",\r\n            \"leveltext\":\"Supervisor\"\r\n         }\r\n      ]\r\n\r\n   }\r\n}";

            Dictionary<string, object> dict = new JavaScriptSerializer().Deserialize<Dictionary<string, object>>(json);
            object postalCode = ((Dictionary<string, object>)dict["itemlist"])["workflow"];
            //Perform operation on postalCode
        }

反序列化json字符串数组

2 个答案: