c# - How to append a node in the existing JSON string?

问题描述:

I have a JSON String as below.

 {
"Filename":"mypage.html",
"Info":{
"title":{
"Name":"title",
"Values":[
"This is title"
],
"NumericValues":[
],
"DateTimeValues":[
],
"LinkedComponentValues":[
],
"FieldType":0
}
},
"Id":"123",
"Title":"This is my page"
}

I am desearilizing the JSON input string as below.

 var outputobject= JsonConvert.DeserializeObject(input);

Now I would like to add a below new node in the input JSON string (after the title in the info) using C#.

"description":{
"Name":"description",
"Values":[
"This is description"
],
"NumericValues":[
],
"DateTimeValues":[
],
"LinkedComponentValues":[
],
"FieldType":0
}

After adding the node, I want to searilize the object into string.

I am facing issue to add the new node in the input json string under the Info node. I am just giving small example. But my input JSON string is big one and it has different structure. but it is valid JSON.

My Final JSON should be as below.

 {
"Filename":"mypage.html",
"Info":{
"title":{
"Name":"title",
"Values":[
"This is title"
],
"NumericValues":[
],
"DateTimeValues":[
],
"LinkedComponentValues":[
],
"FieldType":0
}
"description":{
"Name":"description",
"Values":[
"This is description"
],
"NumericValues":[
],
"DateTimeValues":[
],
"LinkedComponentValues":[
],
"FieldType":0
}
},
"Id":"123",
"Title":"This is my page"
}

This is what am trying, I need to add inside the "Info". Please note, am not creating a model or generating input JSON. I am getting an input JSON as string. After getting JSON string, I need to append a attribute (Description) inside the "Info".

 var inputobject = JsonConvert.DeserializeObject(input);
var description = new Description
{
Name = "Description",
Values = new List<string>{"This is description"},
NumericValues = new List<string>(),
DateTimeValues = new List<string>(),
LinkedComponentValues = new List<string>(),
FieldType = 0,
KeywordValues = new List<string>(),
};
var descriptionObject = JObject.FromObject(description);
var test = JObject.FromObject(inputobject);
test.Add("Descrition", descriptionObject);

Regards,

Jey

网友答案:

You can use Json.Net's index[] to modify JSON.

class Program
{
    static void Main(string[] args)
    {
        var item = @"
            {
                ""Filename"":""mypage.html"",
                ""Info"":{
                    ""title"":{
                        ""Name"":""title"",
                        ""Values"":[""This is title""],
                        ""NumericValues"":[],
                        ""DateTimeValues"":[],
                        ""LinkedComponentValues"":[],
                        ""FieldType"":0
                    }
                },
                ""Id"":""123"",
                ""Title"":""This is my page""
            }";

        var description = @"{
                ""Name"":""description"",
                ""Values"":[""This is description""],
                ""NumericValues"":[],
                ""DateTimeValues"":[],
                ""LinkedComponentValues"":[],
                ""FieldType"":0}";

        var itemJObj = JObject.Parse(item);
        var descriptionJObj = JObject.Parse(description);

        var titleJObj = itemJObj["Info"] as JObject;
        titleJObj.Add("description", descriptionJObj);

        var serializer = new JsonSerializer{ContractResolver = new CamelCasePropertyNamesContractResolver()};
        var json = JObject.FromObject(itemJObj, serializer);

        Console.WriteLine(json);
        Console.ReadLine();
    }
}

网友答案:

Always make sure your viewmodels represent what you want to get as the final output.

First Change your classes like below.

public class JsonRoot
{
    public string Filename { get; set; }

    public Info Info { get; set; }

    public string Id { get; set; }

    public string Title { get; set; }
}

public class Info
{
    public Title title { get; set; }

    public Description description { get; set; }
}

public class Title
{
    public string Name { get; set; }

    public string[] Values { get; set; }

    public object[] NumericValues { get; set; }

    public object[] DateTimeValues { get; set; }

    public object[] LinkedComponentValues { get; set; }

    public int FieldType { get; set; }
}

public class Description
{
    public string Name { get; set; }

    public string[] Values { get; set; }

    public object[] NumericValues { get; set; }

    public object[] DateTimeValues { get; set; }

    public object[] LinkedComponentValues { get; set; }

    public int FieldType { get; set; }
}

Then test your json using this test class.

public class MyJsonTest
{
    public void TestNewJson()
    {
        var root = new JsonRoot()
        {
            Filename = "mypage.html",
            Id = "123",
            Title = "This is my page",
            Info = new Info()
                    {
                        description =
                            new Description()
                            {
                                DateTimeValues = new object[] { DateTime.Now, DateTime.UtcNow },
                                FieldType = 1,
                                LinkedComponentValues = new object[] { "ABC", "XYZ" },
                                Name = "MyInfo",
                                NumericValues = new object[] { 1, 2, 3, 4, 5 },
                                Values = (new List<string> { "some values" }).ToArray(),
                            },
                        title = new Title()
                            {
                                FieldType = 5,
                                NumericValues = new object[] { 1, 2, 43 },
                                Values = new string[] { "sdfs", "dfgdf" },
                                Name = "Some name",
                                LinkedComponentValues = new object[] {"34555", "678786"},
                                DateTimeValues = new object[] {DateTime.Now},
                            },
                    },
        };

        var json = JsonConvert.SerializeObject(root);
        Console.WriteLine(json);
    }

This should give you a json like below.

{
  "Filename": "mypage.html",
  "Info": {
    "title": {
      "Name": "Some name",
      "Values": [
        "sdfs",
        "dfgdf"
      ],
      "NumericValues": [
        1,
        2,
        43
      ],
      "DateTimeValues": [
        "2016-09-28T09:57:52.1513109+10:00"
      ],
      "LinkedComponentValues": [
        "34555",
        "678786"
      ],
      "FieldType": 5
    },
    "description": {
      "Name": "MyInfo",
      "Values": [
        "some values"
      ],
      "NumericValues": [
        1,
        2,
        3,
        4,
        5
      ],
      "DateTimeValues": [
        "2016-09-28T09:57:52.1498114+10:00",
        "2016-09-27T23:57:52.1508118Z"
      ],
      "LinkedComponentValues": [
        "ABC",
        "XYZ"
      ],
      "FieldType": 1
    }
  },
  "Id": "123",
  "Title": "This is my page"
}

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c# - How to append a node in the existing JSON string?