sledgemapper/Sledgemapper.Api/Handlers/GetCampaignPlayersCommandHandler.cs

using MediatR;
using Microsoft.EntityFrameworkCore;
using Sledgemapper.Api.Commands;
using Sledgemapper.Api.Infrastructure.Data;
using Sledgemapper.Shared.Entities;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

namespace Sledgemapper.Api.Handlers
{
    public class GetCampaignPlayersCommandHandler : IRequestHandler<GetCampaignPlayersCommand, List<Player>>
    {
        private readonly IMediator _mediator;
        private readonly SledgemapperDbContext _dbcontext;

        public GetCampaignPlayersCommandHandler(IMediator mediator, SledgemapperDbContext dbcontext)
        {
            _mediator = mediator;
            _dbcontext = dbcontext;
        }

        public async Task<List<Player>> Handle(GetCampaignPlayersCommand command, CancellationToken cancellationToken)
        {
            try
            {
                var user = await _dbcontext.Users.FindAsync(command.UserId);
                _dbcontext.Attach(user);

                var campaign = await _dbcontext.Campaigns.Where(campaign => campaign.CampaignName == command.CampaignName && campaign.OwnerId == command.UserId).Include(campaign => campaign.InvitedUsers).FirstAsync();

                var players = campaign.InvitedUsers.Select(user => new Player { Initials = user.Initials, UserName = user.UserName }).ToList();
                return players;
            }
            catch (Exception ex)
            {
            }
            return null;
        }
    }
}