https://msdn.microsoft.com/en-us/library/jj679962(v=vs.113).aspx
1.引用Entity Framework
2.Data Annotations
1)主键:[Key]
2)复合主键:多个[Key]
3)外键:[ForeignKey] [ForeignKey("BlogId")]
4)必须:[Required]
5)长度:[MaxLength(10),MinLength(5)]
6)非映射到数据库:[NotMapped]
7)复合类:[ComplexType]
8)表和字段映射:[Table("InternalBlogs")] [Column(“BlogDescription", TypeName="ntext")]