basic player management

Sledgemapper.Api/Handlers/InvitePlayerToCampaignCommandHandler.cs

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+using MediatR;
+using Microsoft.EntityFrameworkCore;
+using Sledgemapper.Api.Commands;
+using Sledgemapper.Api.Infrastructure.Data;
+using System;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Sledgemapper.Api.Handlers
+{
+    public class InvitePlayerToCampaignCommandHandler : IRequestHandler<InvitePlayerToCampaignCommand, bool>
+    {
+        private readonly IMediator _mediator;
+        private readonly SledgemapperDbContext _dbcontext;
+
+        public InvitePlayerToCampaignCommandHandler(IMediator mediator, SledgemapperDbContext dbcontext)
+        {
+            _mediator = mediator;
+            _dbcontext = dbcontext;
+        }
+
+        public async Task<bool> Handle(InvitePlayerToCampaignCommand command, CancellationToken cancellationToken)
+        {
+            try
+            {
+                var user = await _dbcontext.Users.FindAsync(command.UserId);
+
+                var campaign = await _dbcontext.Campaigns.Where(campaign=>campaign.CampaignName==command.CampaignName && campaign.OwnerId==command.UserId).Include(campaign=>campaign.InvitedUsers).FirstAsync();
+                var invitedUser = await _dbcontext.Users.FirstOrDefaultAsync(user=>user.Email==command.Email);
+                _dbcontext.Attach(invitedUser);
+                _dbcontext.Attach(campaign);
+                campaign.InvitedUsers.Add(invitedUser);
+                _dbcontext.Campaigns.Update(campaign);
+                await _dbcontext.SaveChangesAsync();
+                return true;
+            }
+            catch (Exception ex)
+            {
+            }
+            return false;
+        }
+    }
+}