如何将json字符串转换为列表？ [英] How to convert the json string into list?

问题描述

我在我的c＃应用程序中使用了其余的post服务，该应用程序发送了jsonstring结果。我想将该结果转换为列表，但它给出了错误。





输出字符串： -

I am consuming the rest post service in my c# application which sends the jsonstring result. I want to convert that result into the list but it is giving error.


Output String:-

{"SearchDocumentResult":"[{\"ContextType\":\"ddd\",\"ContextIDPrimary\":\"TestContextP\",\"ContextIDSecondary\":\"TestContextS\",\"ContextIDTertiary\":\"\",\"RequirementID\":\"17\",\"Source\":\"image\",\"DocumentName\":\"4.pdf\",\"DocumentImage\":\"\",\"ErrorCode\":\"0\",\"ErrorDescription\":\"\",\"createdBy\":\"\",\"createdDate\":\"12-07-2017 15:39:57\"},{\"ContextType\":\"ddd\",\"ContextIDPrimary\":\"TestContextP\",\"ContextIDSecondary\":\"TestContextS\",\"ContextIDTertiary\":\"\",\"RequirementID\":\"18\",\"Source\":\"image\",\"DocumentName\":\"4.pdf\",\"DocumentImage\":\"\",\"ErrorCode\":\"0\",\"ErrorDescription\":\"\",\"createdBy\":\"\",\"createdDate\":\"12-07-2017 15:42:07\"}]"}

我得到了以上输出为json字符串。我无法将上面的字符串转换为List。任何人都可以指导我这个。



我尝试过：

I am getting above output as json string . I am unable to convert above string to List. Can anyone guide me on this.

What I have tried:

public class test
        {
            public string ContextType { get; set; }
            public string ContextIDPrimary { get; set; }
            public string ContextIDSecondary { get; set; }
            public string ContextIDTertiary { get; set; }
            public string Source{get;set;}
            public string DocumentID { get; set; }
                
        }

public class JsonHelper
   {
       /// <summary>
       /// JSON Serialization
       /// </summary>
       public static string JsonSerializer<T>(T t)
       {
           DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
           MemoryStream ms = new MemoryStream();
           ser.WriteObject(ms, t);
           string jsonString = Encoding.UTF8.GetString(ms.ToArray());
           ms.Close();
           return jsonString;
       }
       /// <summary>
       /// JSON Deserialization
       /// </summary>
       public static T JsonDeserialize<T>(string jsonString)
       {
           DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
           MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));
           T obj = (T)ser.ReadObject(ms);
           return obj;
       }
   }

public class RootObject
    {
       // public List<SearchDocumentResult> SearchDocumentResult { get; set; }

        public IEnumerable<SearchDocumentResult> SearchDocumentResult { get; set; }

        //public List<Person> People1 { get; set; }
    }

protected void Button1_Click(object sender, EventArgs e)
        {
          

            test t = new test
            {
                ContextType = "ddd",
                ContextIDPrimary = "",
                ContextIDSecondary = "",
                ContextIDTertiary = " ",
                Source = "",
                DocumentID = ""

            };

            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(test));
            MemoryStream mem = new MemoryStream();
            ser.WriteObject(mem, t);
            string data = Encoding.UTF8.GetString(mem.ToArray(), 0, (int)mem.Length);
            WebClient webClient = new WebClient();
            webClient.Headers["Content-type"] = "application/json";
            webClient.Encoding = Encoding.UTF8;
            string result = webClient.UploadString("http://192.168.0.151:222/Service1.svc/SearchDocument", "POST", data);

            var result11 = JsonHelper.JsonDeserialize<RootObject1>(result);

            //JavaScriptSerializer serializer = new JavaScriptSerializer();
            //serializer.MaxJsonLength = Int32.MaxValue;
           
           // var a = serializer.Deserialize(result, typeof(object));
          

          // string json = "{\"People\":[{\"FirstName\":\"Hans\",\"LastName\":\"Olo\"},{\"FirstName\":\"Jimmy\",\"LastName\":\"Crackedcorn\"}]}";

          //// var result11 = JsonHelper.JsonDeserialize<RootObject1>(json);

          // var firstNames = result11.People.Select(p => p.FirstName).ToList();
          // var lastNames = result11.People.Select(p => p.LastName).ToList();

        }

推荐答案

查找 Newtonsoft [ ^ ]。这几天它几乎是行业标准。



用NuGet获取它。互联网上有大量的指令，但这里有如何使用它：

Look up Newtonsoft[^]. It's pretty much industry standard these days.

Get it with NuGet. There are loads of instructions all over the interwebs, but here's how to use it:

var myTest = Movie m = JsonConvert.DeserializeObject<test[]>(json);

您可以甚至只是反序列化为动态对象，但创建自己的类总是更好，就像您已经完成的那样



更新：公平点，这不适用于上面的json开箱即用。



你可以反序列化一个数组，但你必须反序列化为一个List对象。



第一个问题是你的json包含一个json子字符串。您必须首先反序列化：

You "can" even just deserialize into a dynamic object, but it's always better to create your own classes, just as you have done

UPDATE: fair point, this won't work out of the box with the json above.

You can deserialise an array but you have to deserialize into a List object.

The first issue is that your json contains a json sub-string. You will have to deserialize this first:

var searchResult = JObject.Parse(json).SearchDocumentResult; //dynamic but gets string
//then you can deserialize that:
var myTest = Movie m = JsonConvert.DeserializeObject<List<test>>(json);

它取决于结果中的内容。如果它只是JSON，那么你需要反序列化为List< test>因为它代表的是一组测试对象。<​​br />

It depends what is in "result". If it is just the JSON then you need to deserialise to a List<test> as it represents is an array of test objects.

string result = "[{\"ContextType\":\"ddd\",\"ContextIDPrimary\":\"TestContextP\",\"ContextIDSecondary\":\"TestContextS\",\"ContextIDTertiary\":\"\",\"RequirementID\":\"17\",\"Source\":\"image\",\"DocumentName\":\"4.pdf\",\"DocumentImage\":\"\",\"ErrorCode\":\"0\",\"ErrorDescription\":\"\",\"createdBy\":\"\",\"createdDate\":\"12-07-2017 15:39:57\"},{\"ContextType\":\"ddd\",\"ContextIDPrimary\":\"TestContextP\",\"ContextIDSecondary\":\"TestContextS\",\"ContextIDTertiary\":\"\",\"RequirementID\":\"18\",\"Source\":\"image\",\"DocumentName\":\"4.pdf\",\"DocumentImage\":\"\",\"ErrorCode\":\"0\",\"ErrorDescription\":\"\",\"createdBy\":\"\",\"createdDate\":\"12-07-2017 15:42:07\"}]";

var result11 = JsonHelper.JsonDeserialize<List<test>>(result);

如果结果有了它周围的xml，你需要使用类似XmlDocument的东西从XML中提取JSON然后按照上面的方式执行。

If "result" has the xml around it you'll need to use something like XmlDocument to extract the JSON from the XML then do as above.

尝试这样的事情。

try something like this.

var testString={"SearchDocumentResult":"[{\"ContextType\":\"ddd\",\"ContextIDPrimary\":\"TestContextP\",\"ContextIDSecondary\":\"TestContextS\",\"ContextIDTertiary\":\"\",\"RequirementID\":\"17\",\"Source\":\"image\",\"DocumentName\":\"4.pdf\",\"DocumentImage\":\"\",\"ErrorCode\":\"0\",\"ErrorDescription\":\"\",\"createdBy\":\"\",\"createdDate\":\"12-07-2017 15:39:57\"},{\"ContextType\":\"ddd\",\"ContextIDPrimary\":\"TestContextP\",\"ContextIDSecondary\":\"TestContextS\",\"ContextIDTertiary\":\"\",\"RequirementID\":\"18\",\"Source\":\"image\",\"DocumentName\":\"4.pdf\",\"DocumentImage\":\"\",\"ErrorCode\":\"0\",\"ErrorDescription\":\"\",\"createdBy\":\"\",\"createdDate\":\"12-07-2017 15:42:07\"}]"};

var result = JsonConvert.DeserializeObject<List<test>>(json);

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