Entity Framework Fluent API Articles Sample Code

Related Article : How to Use Entity Framework Fluent API ?

Project Tree

SchoolEntities.cs

using System.ComponentModel.DataAnnotations;

using System.Data.Entity;

using System.Data.Entity.ModelConfiguration.Conventions;

namespace EFFluventAPI.Models

{

  public class SchoolEntities: DbContext

  {

    public DbSet<Course> Courses { get; set; }

    public DbSet<Department> Departments { get; set; }

    public DbSet<Instructor> Instructors { get; set; }

    public DbSet<OfficeAssignment> OfficeAssignments { get; set; }

    protectedoverride voidOnModelCreating(DbModelBuilder modelBuilder)

    {

      //Configure Code First to ignore PluralizingTableName convention

      //If you keep this convention then the generated tables

      //will have pluralized names

      modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();

      modelBuilder.Entity<OfficeAssignment>().HasKey(t => t.InstructorId);

      modelBuilder.Entity<Department>()

            .HasKey(t => new { t.DepartmentId, t.Name });

      modelBuilder.Entity<Department>()

            .Property(t => t.DepartmentId)

            .HasDatabaseGeneratedOption(DatabaseGeneratedOption.None);

      modelBuilder.Entity<Department>().Property(t => t.Name).HasMaxLength(50);

      modelBuilder.Entity<Department>().Property(t => t.Name).IsRequired();

      modelBuilder.Entity<Department>().Ignore(t => t.Budget);

      modelBuilder.Entity<Department>()

             .Property(t => t.Name).HasColumnName("DepartmentName");

      modelBuilder.Entity<Course>()

             .HasRequired(c => c.Department)

             .WithMany(t => t.Courses).Map(m => m.MapKey("ChangedDepartmentId"));

      modelBuilder.Entity<Department>().Property(t => t.Name).IsUnicode(false);

      modelBuilder.Entity<Department>()

            .Property(p => p.Name).HasColumnType("varchar");

      modelBuilder.ComplexType<Details>()

            .Property(t => t.Location).HasMaxLength(20);

      modelBuilder.Entity<OnsiteCourse>()

           .Property(t => t.Details.Location).HasMaxLength(20);

      modelBuilder.Entity<OfficeAssignment>()

             .Property(t => t.Timestamp).IsConcurrencyToken(); 

            

       modelBuilder.Entity<OfficeAssignment>()

            .Property(t => t.Timestamp).IsRowVersion();

        }

    }

}

Course.cs

using System.Collections.Generic;

namespace EFFluventAPI.Models

{

    public class Course

    {

        publicCourse()

        {

            this.Instructors = new HashSet<Instructor>();

        }

        // Primary key

        public int CourseId { get; set; }

        public string Title { get; set; }

        public int Credits { get; set; }

        // Foreign key

        public int DepartmentId { get; set; }

        // Navigation properties

        public virtual DepartmentDepartment { get; set; }

        public virtual ICollection<Instructor> Instructors { get; private set; }

    }

}

Department.cs

using System.Collections.Generic;

namespace EFFluventAPI.Models

{

    public class Department

    {

        publicDepartment()

        {

            this.Courses = new HashSet<Course>();

        }

        // Primary key

        public int DepartmentId { get; set; }

        public string Name { get; set; }

        public decimal Budget { get; set; }

        publicSystem.DateTime StartDate { get; set; }

        public int? Administrator { get; set; }

        // Navigation property

        public virtual ICollection<Course> Courses { get; private set; }

    }

}

Instructor.cs

using System;

using System.Collections.Generic;

namespace EFFluventAPI.Models

{

    public class Instructor

    {

        publicInstructor()

        {

            this.Courses = new List<Course>();

        }

        // Primary key

        public int InstructorId { get; set; }

        public string LastName { get; set; }

        public string FirstName { get; set; }

        public DateTime HireDate { get; set; }

        // Navigation properties

        public virtual ICollection<Course> Courses { get; private set; }

    }

}

OfficeAssignment.cs

using System;

using System.ComponentModel.DataAnnotations;

namespace EFFluventAPI.Models

{

    public class OfficeAssignment

    {

        public Int32 InstructorId { get; set; }

        public string Location { get; set; }

        public Byte[] Timestamp { get; set; }

        // Navigation property

        public virtual InstructorInstructor { get; set; }

    }

}

Details.cs

using System;

namespace EFFluventAPI.Models

{

    public class Details

    {

        public DateTime Time { get; set; }

        public string Location { get; set; }

        public string Days { get; set; }

    }

}

OnsiteCourse.cs

namespace EFFluventAPI.Models

{

    public class OnsiteCourse: Course

    {

        publicOnsiteCourse()

        {

            Details = newDetails();

        }

        public Details Details { get; set; }

    }

}

Related Article : How to Use Entity Framework Fluent API ?

Related Posts by Categories