Extract values from appsetting.json doesnt work

Question

i have an issue about extract value from appsetting.json

appsetting.json

"Negozi": {
"PerPage": 10,
"Order": {
  "By": "Name",
  "Ascending": false,
  "Allow": ["Nome", "Citta"]
  }
}

Startup.cs

public void ConfigureServices(IServiceCollection services)
    {
         //useless code for this question
          ...

         //Options
        services.Configure<NegoziOptions>(configuration.GetSection("Negozi"));
     
    }

NegoziOptions.cs

public class NegoziOptions
{
    public int PerPage { get; set; }

    public NegoziOrderOptions Order { get; set; }
}

public class NegoziOrderOptions{
    public string By { get; set; }

    public bool Ascending { get; set; }

    public string Allow { get; set; }
  }
}

Then I want to extract data and this is my method

public class EfCoreNegoziService : INegoziService
{
    private readonly C3PAWMDbContext dbContext;
    private readonly IOptionsMonitor<NegoziOptions> negozioOptions;

    public EfCoreNegoziService(C3PAWMDbContext dbContext, IOptionsMonitor<NegoziOptions> negozioOptions)
    {
        this.negozioOptions = negozioOptions;
        this.dbContext = dbContext;

    }



public async Task<List<NegozioViewModel>> GetNegoziAsync(string search, int page)
    {
        search = search ?? "";

        page = Math.Max(1, page);
        int limit = negozioOptions.CurrentValue.PerPage;
        int offset = (page - 1) * limit;

        /*
         Other code
        */
  }

Im trying to debug but this is equals to 0

int limit = negozioOptions.CurrentValue.PerPage;

I have already take data from appsetting.json like ConnectionsStrings and it works fine but i can't understand why I can't extract from Negozi

Farhad Zamani · Accepted Answer · 2021-07-25 12:23:58Z

2

Your Negozi property in appsettings.json format is not match with NegoziOptions class.

Allow property in appsettings.json is array of strings and Allow property in NegoziOrderOptions class is string.

You should change type of Allow to array of string in NegoziOrderOptions.

Your NegoziOptions class should be like this

public class NegoziOptions
{
    public int PerPage { get; set; }

    public NegoziOrderOptions Order { get; set; }
}

public class NegoziOrderOptions
{
    public string By { get; set; }

    public bool Ascending { get; set; }

    public string[] Allow { get; set; }
}

your appsettings.json should be like this

{
  "Negozi": {
    "PerPage": 10,
    "Order": {
      "By": "Name",
      "Ascending": false,
      "Allow": [
        "Nome",
        "Citta"
      ]
    }
  }
}

And Configure method:

services.Configure<NegoziOptions>(a => configuration.GetSection("Negozi").Bind(a));

edited Jul 25, 2021 at 12:23

answered Jul 25, 2021 at 12:17

Farhad Zamani

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1 Comment

MrBuffalo Over a year ago

Thanks, fixed. The issue was the string[]. It was a mistake when I mapped the json class into the Option class

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