basic player management

Sledgemapper.Api/Handlers/GetCampaignsCommandHandler.cs

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+using MediatR;
+using Sledgemapper.Api.Commands;
+using Sledgemapper.Api.Infrastructure.Data;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Sledgemapper.Api.Handlers
+{
+    public class GetCampaignsCommandHandler : IRequestHandler<GetCampaignsCommand, List<Core.Entities.Campaign>>
+    {
+        private readonly IMediator _mediator;
+        private readonly SledgemapperDbContext _dbcontext;
+
+        public GetCampaignsCommandHandler(IMediator mediator, SledgemapperDbContext dbcontext)
+        {
+            _mediator = mediator;
+            _dbcontext = dbcontext;
+        }
+
+        public async Task<List<Core.Entities.Campaign>> Handle(GetCampaignsCommand command, CancellationToken cancellationToken)
+        {
+            try
+            {
+                var user = await _dbcontext.Users.FindAsync(command.UserId);
+                _dbcontext.Attach(user);
+                var campaigns = _dbcontext.Campaigns.Where(campaign => campaign.OwnerId == command.UserId || campaign.InvitedUsers.Contains(user));
+
+                return campaigns.ToList();
+            }
+            catch (Exception ex)
+            {
+            }
+            return new List<Core.Entities.Campaign>();
+        }
+    }
+}