public class HolidayRequestModel
{
    public string CountryCode { get; set; }
    public int Year { get; set; }
}

public class HolidayResponseModel
{
    public string Name { get; set; }
    public string LocalName { get; set; }
    public DateTime? Date { get; set; }
    public string CountryCode { get; set; }
    public bool Global { get; set; }
}

public partial class HolidaysExplorer
{
    private HolidayRequestModel HolidaysModel = new HolidayRequestModel();
    private List<HolidayResponseModel> Holidays = new List<HolidayResponseModel>();
 
    [Inject]
    protected IHolidaysApiService HolidaysApiService { get; set; }
 
    private async Task HandleValidSubmit()
    {
        Holidays = await HolidaysApiService.GetHolidays(HolidaysModel);
    }
}

<EditForm Model="@HolidaysModel" OnValidSubmit="@HandleValidSubmit" class="form-inline">
     
   <label class="ml-2">Country Code:</label>
   <InputText id="CountryCode" @bind-Value="HolidaysModel.CountryCode" class="form-control" />
     
   <label class="ml-2">Year:</label>
   <InputNumber id="Year" @bind-Value="HolidaysModel.Year" class="form-control" />
     
   <button class="btn btn-primary ml-2" type="submit">Submit</button>
     
</EditForm>

@if (Holidays.Count > 0)
{
    <table class="table table-bordered table-striped table-sm">
       <thead>
          <tr>
             <th>Date</th>
             <th>Name</th>
             <th>Local Name</th>
             <th>Country Code</th>
             <th>Global</th>
          </tr>
       </thead>
       <tbody>
          @foreach (var item in Holidays)
          {
              <tr>
                 <td>@item.Date.Value.ToShortDateString()</td>
                 <td>@item.Name</td>
                 <td>@item.LocalName</td>
                 <td>@item.CountryCode</td>
                 <td>@item.Global</td>
              </tr>
          }
       </tbody>
    </table>
}

@page "/"
<h3>Holidays Explorer</h3>
<br />
 
<EditForm Model="@HolidaysModel" OnValidSubmit="@HandleValidSubmit" class="form-inline">
 
   <label class="ml-2">Country Code:</label>
   <InputText id="CountryCode" @bind-Value="HolidaysModel.CountryCode" class="form-control" />
 
   <label class="ml-2">Year:</label>
   <InputNumber id="Year" @bind-Value="HolidaysModel.Year" class="form-control" />
 
   <button class="btn btn-primary ml-2" type="submit">Submit</button>
 
</EditForm>
 
<br />
@if (Holidays.Count > 0)
{
    <table class="table table-bordered table-striped table-sm">
       <thead>
          <tr>
             <th>Date</th>
             <th>Name</th>
             <th>Local Name</th>
             <th>Country Code</th>
             <th>Global</th>
          </tr>
       </thead>
       <tbody>
          @foreach (var item in Holidays)
          {
              <tr>
                 <td>@item.Date.Value.ToShortDateString()</td>
                 <td>@item.Name</td>
                 <td>@item.LocalName</td>
                 <td>@item.CountryCode</td>
                 <td>@item.Global</td>
              </tr>
          }
       </tbody>
    </table>
}

public interface IHolidaysApiService
{
    Task<List<HolidayResponseModel>> GetHolidays(HolidayRequestModel holidaysRequest);
}

public class HolidaysApiService : IHolidaysApiService
{
    private readonly IHttpClientFactory _clientFactory;
 
    public HolidaysApiService(IHttpClientFactory clientFactory)
    {
        _clientFactory = clientFactory;
    }
 
    public async Task<List<HolidayResponseModel>> GetHolidays(HolidayRequestModel holidaysRequest)
    {
        var result = new List<HolidayResponseModel>();
 
        var url = string.Format("https://date.nager.at/api/v2/PublicHolidays/{0}/{1}", 
            holidaysRequest.Year, holidaysRequest.CountryCode);
 
        var request = new HttpRequestMessage(HttpMethod.Get, url);
        request.Headers.Add("Accept", "application/vnd.github.v3+json");
 
        var client = _clientFactory.CreateClient();
 
        var response = await client.SendAsync(request);
 
        if (response.IsSuccessStatusCode)
        {
            var stringResponse = await response.Content.ReadAsStringAsync();
 
            result = JsonSerializer.Deserialize<List<HolidayResponseModel>>(stringResponse,
                new JsonSerializerOptions() { PropertyNamingPolicy = JsonNamingPolicy.CamelCase });
        }
        else
        {
            result = Array.Empty<HolidayResponseModel>().ToList();
        }
 
        return result;
    }
}