how to assign variable in json in restrequest c#

Question

Here is my code.Everything works fine when I hard code message attribute in the json. I want to assign variable in 'message' attribute of the json.

var client = new RestClient("172.16.255.254:2016/settings");
client.Timeout = -1;
var request = new RestRequest(Method.POST);
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\r\n\r\n\"_id\": 
\"98e8d3cd47fad6ce8e3f7b8d42cb4d9b\",\r\n\r\n\"_type\": 
\"SetRealtimeMessage\" ,\r\n\r\n\"message\": \"c3BlZWQgZXhjZWVkZWQh\", 
\r\n\"width\":240,\r\n\"fontBackground\":0,\r\n\"fontColor\": 
0xFFFFBF00,\r\n//\"fontColor\": 0XFFBF00,\r\n\"fontSize\": 
24,\r\n\r\n\"lineSpace\": 0,\r\n\r\n\"left\": 0, 
\r\n\r\n\"windowBackground\": 0, \r\n\r\n\"verticalPos\": 0, 
\r\n\r\n\"horizontalPos\": 0, \r\n\r\n\r\n\"showType\": 0, \r\n\"speed\": 20, 
\r\n\r\n\"moveCount\": 1,\r\n\r\n\r\n\"residenceTime\": -1\r\n\r\n}",  
ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
Console.WriteLine(response.Content);

Creating a JSON in this manner is not a good and true way. try creating an object and then by using Newton.Json or ... try to Serialize your JSON Object. — Hamed Moghadasi
– Hamed Moghadasi, Commented Feb 19, 2020 at 12:36

Kurt Hamilton · Accepted Answer · 2020-02-19 12:47:03Z

3

To avoid writing out a long JSON string manually, you can use the ubiquitous Newtonsoft.Json NuGet package to create a JSON string from an object.

using System;
using Newtonsoft.Json;

public class Program
{
    public static void Main()
    {
        var message = "Hello, World!";

        string json = JsonConvert.SerializeObject(new 
        {
            id = 123,
            message = message
        });

        Console.WriteLine(json);

        // {"id":123,"message":"Hello, World!"}
    }       
}

DEMO: https://dotnetfiddle.net/FPFrng

You can pass any object in, I'm just creating an anonymous object here for a simple demo.

edited Feb 19, 2020 at 12:47

answered Feb 19, 2020 at 12:37

Kurt Hamilton

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BWA · Accepted Answer · 2020-02-19 12:38:54Z

2

Use JSON.NET and serialize to json your object and send it.

var myVariable = ...

string message = JsonConvert.SerializeObject(myVariable);
request.AddParameter("application/json", message);

answered Feb 19, 2020 at 12:38

BWA

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Comments

Cid · Accepted Answer · 2020-02-19 12:42:30Z

2

Short and ugly answer :

You can concate your JSON string along with your variable, such as

var MyValue = "bar";
var json = "{\"foo\":\"" + MyValue + "\"}"; // {"foo":"bar"}

Long and better (IMHO) way

Do not directly write JSON strings ! Do you notice how unreadable it is ? You can instead create anonymous objects and serialize them, using, in example, json.net :

var MyValue = "bar";
var MyObject = new
{
    foo = MyValue
};
// using Newtonsoft.Json; // <--- taken from the nugget package newtonsoft.json
var json = JsonConvert.SerializeObject(MyObject, Formatting.Indented);
Console.WriteLine(json);

This outputs :

{
  "foo": "bar"
}

answered Feb 19, 2020 at 12:42

Cid

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Comments

Aravind Anil · Accepted Answer · 2020-02-19 12:33:43Z

0

You can use string.Format()

request.AddParameter("application/json", string.Format("{\r\n\r\n\"_id\": 
\"98e8d3cd47fad6ce8e3f7b8d42cb4d9b\",\r\n\r\n\"_type\": 
\"SetRealtimeMessage\" ,\r\n\r\n\"message\": \"{0}\", 
\r\n\"width\":240,\r\n\"fontBackground\":0,\r\n\"fontColor\": 
0xFFFFBF00,\r\n//\"fontColor\": 0XFFBF00,\r\n\"fontSize\": 
24,\r\n\r\n\"lineSpace\": 0,\r\n\r\n\"left\": 0, 
\r\n\r\n\"windowBackground\": 0, \r\n\r\n\"verticalPos\": 0, 
\r\n\r\n\"horizontalPos\": 0, \r\n\r\n\r\n\"showType\": 0, \r\n\"speed\": 20, 
\r\n\r\n\"moveCount\": 1,\r\n\r\n\r\n\"residenceTime\": -1\r\n\r\n}",messageVar)

answered Feb 19, 2020 at 12:33

Aravind Anil

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4 Comments

Aravind Anil Over a year ago

So you need to make that message property as the parameter, in string.Format(); . But I recommend you to create a JSON Object property as mentioned by Kurt

Jaswandi Lande Over a year ago

Thanks. But for this I am getting exception as Format string contains invalid placeholder

Aravind Anil Over a year ago

Oh sorry that may be because of the {{ to be used while we have to print { string.Format(" {{ \r\n\r\n\"_id\": ...... like this

Prany Over a year ago

This is not the right way to create a json like this

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