Вроде все ошибки устранил. не запускал.

PARR.DAL/Services/Implementations/ApplicationInHostService.cs

@@ -0,0 +1,25 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Logging;
+using PARR.DAL.Context;
+using PARR.DAL.Models;
+using PARR.DAL.Services.Abstracts;
+using PARR.DAL.Services.Interfaces;
+
+namespace PARR.DAL.Services.Implementations
+{
+    internal class ApplicationInHostService : BaseService<ApplicationInHost>, IApplicationInHostService
+    {
+        private readonly DataContext dataContext;
+        private readonly ILogger<ApplicationInHostService> logger;
+
+        public ApplicationInHostService(DataContext dataContext, ILogger<ApplicationInHostService> logger) : base(logger)
+        {
+            this.dataContext = dataContext;
+            this.logger = logger;
+        }
+
+        protected override DbSet<ApplicationInHost> EntitySet => dataContext.ApplicationsInHosts;
+
+        protected override DataContext EntitiContext => dataContext;
+    }
+}