How to Loop through serialized json

Question

Res={"result":["123","563"]}

This is the similar json file i have. I have to loop through it and assign each value as ids. I am trying as

Obj = JsonConvert.DeseraializeObject<classname>(Res);
Foreach(string id in Obj)
{Function();}

I'm getting error as class doesn't have extension for getenumerator

Edit:
I did this

List<classname> objlist = jsonconvert.deserializeObject<list<classname>>(res); 
foreach (string id in objlist)
{function();}

getting an error for foreach loop as cannot convert classname to string

Welcome to StackOverflow. Please bear in mind that C# is a case-sensitive language. So, please try to provide valid C# code, which can be compiled. — Peter Csala
– Peter Csala, Commented Jun 30, 2021 at 7:20

Michael · Accepted Answer · 2021-06-30 19:25:41Z

1

In JSON file you have string array with key "results". It can be modelled like this:

public class Result
{
    public List<string> results { get; set; }
}

You can deserialize and then loop through it in the next way:

var data = JsonConvert.DeserializeObject<Result>(Res);
    foreach (var id in data.results)
    {
      // Assignment logic
    }

edited Jun 30, 2021 at 19:25

answered Jun 29, 2021 at 14:06

Michael

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2 Comments

Peter Csala Over a year ago

This code will crash with NullReferenceException. The sample json contains a field called result. Your Result class defines a property (Results) which is not present in the json, that's why it will be null. The app will fail when it reaches foreach. Please fix your proposed solution.

Connor Low Over a year ago

Please explain your code (even explanatory code comments are helpful).

PVA · Accepted Answer · 2021-06-29 13:23:13Z

0

Your object should have property List or List and you will iterate throw it, not in Obj.

answered Jun 29, 2021 at 13:23

PVA

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Comments

MartinM43 · Accepted Answer · 2021-06-29 13:40:10Z

0

Your Json structure looks something like this in c#

using Newtonsoft.Json;

public class Result
{ 
    [JsonProperty("result")]
    List<string> Res { get; set; }
}

Deserialze:

Result r = JsonConvert.DeserializeObject<Result>(jsonString);

Briefly explained: Your json has a property called "result", this property is a "list" of type "string" List<string>.

edited Jun 29, 2021 at 13:40

answered Jun 29, 2021 at 13:33

MartinM43

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