inherited class and properties not included in JSON result from ASP.NET Core API

Question

I have a simple model that I try to serialize to JSON, but some properties don't get included in the result. When my object inherits from a base class, the properties of the base class doesn't appear in the json.

In the JSON string "searchModel" is {}

SearchModelBase.cs:

public interface ISearchModelBase
{
    SearchTypes Type { get; set; }
    string SearchString { get; set; }
}

public abstract class SearchModelBase : ISearchModelBase
{
    public SearchModelBase(SearchTypes type, string searchString)
    {
        this.Type = type;
        this.SearchString = searchString;
    }

    public SearchTypes Type { get; set; }

    public string SearchString { get; set; }
}

public enum SearchTypes
{
    User,
    Site
}

AssetsDefaultSearchModel.cs:

public interface IAssetsDefaultSearchModel : ISearchModelBase
{

}

public class AssetsDefaultSearchModel : SearchModelBase, IAssetsDefaultSearchModel
{
    public AssetsDefaultSearchModel(SearchTypes type, string searchString) : base(type, searchString) 
    {

    }
}

JSON:

{
    "items": [
        {
            "displayName": "FFU Samarin",
            "data": {
                "appId": 3,
                "displayName": "FFU Samarin",

                ..........

In Visual Studio each item in the collection contains AssetsDefaultSearchModel with values in both properties:

Is this .net-core-3? Which serialization library are you using? — Erik Philips, Dec 19 '19 at 08:22

score 2 · Answer 1 · answered Mar 22 '21 at 18:16

2

add below code to your Startup.cs

services.AddControllers().AddNewtonsoftJson();

you can use the Microsoft.AspNetCore.Mvc.NewtonsoftJson NuGet package

answered Mar 22 '21 at 18:16

Öcal Özyavuz

23
3

score 1 · Answer 2 · answered Dec 19 '19 at 08:52

In the interface derived from ISearchResultBase I had to define a new property with the new keyword. I then return an object derived from IAssetsDefaultSearchResult (without replicating the property in the class) and it worked as expected.

public interface IAssetsDefaultSearchResult : ISearchResultBase
{
    new ISearchModelBase SearchModel { get; }

    string DisplayName { get; }

    object Data { get; }

    TagBuilder HtmlTag { get; }
}

inherited class and properties not included in JSON result from ASP.NET Core API

2 Answers2