【轉】FluentAPI詳細用法

• 設置主鍵
  modelBuilder.Entity<x>().HasKey(t => t.Name);
• 設置聯合主鍵
  modelBuilder.Entity<x>().HasKey(t =>new{t.Name,t.ID} );
• 取消數據庫字段標識（取消自動增加）
  modelBuilder.Entity<x>().Property(t=>t.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.None);
• 設置數據庫字段標識（自動增加）
  modelBuilder.Entity<Teacher>().Property(t =>t.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
• 設置字段最大長度
  modelBuilder.Entity<ClassA>().Property(t => t.Name).HasMaxLength(100);
• 設置字段爲必需
  modelBuilder.Entity<ClassA>().Property(t =>t.Id).IsRequired();
• 屬性不映射到數據庫
  modelBuilder.Entity<ClassA>().Ignore(t => t.A);
• 將屬性指定數據庫列名：
  modelBuilder.Entity<ClassA>() .Property(t => t.A) .HasColumnName("A_a");
• 級聯刪除（數據庫默認是不級聯刪除的）
  modelBuilder.Entity<Course>().HasRequired(t => t.Department).WithMany(t => t.Courses).HasForeignKey(d => d.DepartmentID).WillCascadeOnDelete();
• 設置爲Timestamp
  modelBuilder.Entity<OfficeAssignment>() .Property(t => t.Timestamp) .IsRowVersion();
• 表1對0..1(Instructor實體能夠包含零個或一個OfficeAssignment)
  modelBuilder.Entity<OfficeAssignment>().HasRequired(t => t.Instructor).WithOptional(t => t.OfficeAssignment);
• 表1對1
  modelBuilder.Entity<Instructor>().HasRequired(t => t.OfficeAssignment).WithRequiredPrincipal(t => t.Instructor);
• 表1對n（Department爲主表）
  modelBuilder.Entity<Staff>() .HasRequired(c => c.Department) .WithMany(t => t.Staffs)
• 指定外鍵名（指定表Staff中的字段DepartmentID爲外鍵）
  modelBuilder.Entity<Staff>() .HasRequired(c => c.Department) .WithMany(t => t.Staffs) .Map(m => m.MapKey("DepartmentID"));
• 表n對n
  modelBuilder.Entity<Course>()
  .HasMany(t => t.Instructors)
  .WithMany(t => t.Courses)
• 表n對n指定鏈接表名及列名
  modelBuilder.Entity<Course>()
  .HasMany(t => t.Instructors)
  .WithMany(t => t.Courses)
  .Map(m =>
  {
  m.ToTable("CourseInstructor");
  m.MapLeftKey("CourseID");
  m.MapRightKey("InstructorID");
  });
   

轉自：https://www.cnblogs.com/wangshaod/p/10025836.html