Map JSON object to c# class property

Question

I'm getting a bunch of JSON data back from a 3rd party API like this:

returnValue = data["value"].ToObject<List<T>>();

All but one of the fields are just basic name:value pairs like this:

"Name":"Value"

I map the values I need to a class like this:

public sealed class Project
{
    public string Id { get; set; }
    public string Title { get; set; }
    public string Url { get; set; }
    public DateTime ProjectDateLocal { get; set; }
    public string ParentFolderName { get; set; }
    public string ParentFolderId { get; set; }
    //causing trouble
    public Int32 ProjectTypeId { get; set; }

    public string PlayerUrl
    {
        get
        {
            return "http://em.edu.edu/prj/Play/" + this.Id;
        }
    }
}

However, one name:value pair is complicated like this:

"CustomFieldValues":[
        {
          "FieldName":"ProjectTypeId","FieldDefinitionId":"37a2ffeb3bd441f6a60158458910a04d40","DataType":"Integer","Value":"100105"
        }
      ]

I only need the FieldName(ProjectTypeId) and Value, is there a way to get just that have the class recognize that and set it in my ProjectTypeId property?

Thanks!

Community · Accepted Answer · 2017-05-23 12:07:23Z

3

As @viggity stated, you can use Newtonsoft for your problem and the solution provided is good. The only thing you have to do is provide a good string json to the Deserializer.

If you want a simpler solution why don't you use data["value"].ToObject<List<Project>>() ? Note: Assigning attributes like [JsonProperty("FieldNameFromJson")] is ussefull for mappings.

See this post for more info about how you can do this.

edited May 23, 2017 at 12:07

CommunityBot

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answered Oct 7, 2015 at 8:47

Botea Bogdan

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Comments

viggity · Accepted Answer · 2015-10-06 16:17:34Z

2

Use Json.net to deserialize JsonConvert.Deserialize<Project>(jsonStringContent)

Json.net will go multi levels, just add a new class and have your Project have that property.

public class CustomFieldValue
{
    public string FieldName {get;set;}
    public string Value {get; set;}
}

and add a list of them to your Project.

public sealed class Project
{
    public string Id { get; set; }
    ...
    public List<CustomFieldValue> CustomFieldValues { get; set; }
}

Json.net won't have any problem with it. If you don't add FieldDefinitionId, etc then Json.net will just ignore it.

http://www.newtonsoft.com/json

answered Oct 6, 2015 at 16:17

viggity

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6 Comments

SkyeBoniwell Over a year ago

Thanks! Do you mean use: JsonConvert.Deserialize<Project>(jsonStringContent) , instead of: returnValue = data["value"].ToObject<List<T>>();

SkyeBoniwell Over a year ago

In the above, <T> = <Project>

viggity Over a year ago

I'm not sure where your stringified json is in. My guess is it is in data["value"], right? if so then returnValue = JsonConvert.Deserialize<Project>(data["value"])

SkyeBoniwell Over a year ago

Did you mean to use 'JsonConvert.DeserializeObject'? I couldn't find JsonConvert.Deserialize. Thanks.

SkyeBoniwell Over a year ago

This won't work because 'returnValue' needs to be type System.Collections.Generic.List<T>

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