Исполнитель : слой данных

SchoolAgainStudy/SchoolAgainStudyDataModels/Models/IDiy.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SchoolAgainStudyDataModels.Models
+{
+    public interface IDiy : IId
+    {
+        string Title { get; }
+        string Description { get; }
+        string TaskName { get; }
+        DateTime DateCreate { get; }
+        int TaskId { get; }
+        int StudentId { get; }
+        Dictionary<int, IInterest> DiyInterests { get; }
+    }
+}

SchoolAgainStudy/SchoolAgainStudyDataModels/Models/IInterest.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SchoolAgainStudyDataModels.Models
+{
+    public interface IInterest : IId
+    {
+        string Title { get; }
+        string Description { get; }
+
+
+    }
+}

SchoolAgainStudy/SchoolAgainStudyDataModels/Models/IProduct.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SchoolAgainStudyDataModels.Models
+{
+    public interface IProduct : IId
+    {
+        string Title { get; }
+        string Description { get; }
+        DateTime DateCreate { get; }
+        int StudentId { get; }
+        Dictionary<int, IInterest> ProductInterests { get; }
+    }
+}

SchoolAgainStudy/SchoolAgainStudyDataModels/Models/IStudent.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SchoolAgainStudyDataModels.Models
+{
+    public interface IStudent : IId
+    {
+        string Name { get; }
+        int Class { get; }
+        string Email { get; }
+        string Login { get; }
+        string Password { get; }
+        Dictionary<int, IInterest> StudentInterests { get; }
+    }
+}