Major update

leagues/Handlers/GetLeaguesQueryHandler.cs

@@ -0,0 +1,27 @@
+using System;
+using Leagues.DbContexts;
+using Leagues.Entities;
+using Leagues.Helpers;
+using Leagues.Queries;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+
+namespace Leagues.Handlers
+{
+	public class GetLeaguesQueryHandler : IRequestHandler<GetLeaguesQuery, PagedList<League>>
+	{
+		private readonly LeaguesContext _dbContext;
+
+		public GetLeaguesQueryHandler(LeaguesContext dbContext)
+		{
+			_dbContext = dbContext ?? throw new ArgumentNullException(nameof(dbContext));
+		}
+
+		public async Task<PagedList<League>> Handle(GetLeaguesQuery request, CancellationToken cancellationToken)
+		{
+			var leagues = await _dbContext.Leagues.ToListAsync();
+            return PagedList<League>.ToPagedList(await _dbContext.Leagues.ToListAsync(), request.PageNumber, request.PageSize);
+		}
+	}
+}
+