struct&&assiQues

Entities/Contracts/Textbook/Textbook.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Entities.Contracts
+{
+	[Table("textbook")]
+	public class Textbook
+	{
+		[Key]
+		public Guid Id { get; set; }
+
+		public Grade Grade { get; set; } = Grade.Unknown;
+
+		public string Title { get; set; } = string.Empty;
+
+		public Publisher Publisher { get; set; } = Publisher.部编版;
+
+		public SubjectAreaEnum SubjectArea { get; set; } = SubjectAreaEnum.Unknown;
+
+		[InverseProperty(nameof(Lesson.Textbook))]
+		public ICollection<Lesson> Lessons { get; set; }
+
+		public Textbook()
+		{
+			Id = Guid.NewGuid();
+			Lessons = new HashSet<Lesson>();
+		}
+	}
+
+}