目录

文章列表：

创建EF数据模型
Creating an Entity Framework Data Model

实现基础的CRUD功能
Implementing Basic CRUD Functionality

排序、筛选和分页
Sorting, Filtering, and Paging

连接恢复和命令拦截
Connection Resiliency and Command Interception

Code First 迁移和部署
Code First Migrations and Deployment

创建更复杂的数据模型
Creating a More Complex Data Model

读取相关数据
Reading Related Data

更新相关数据
Updating Related Data

使用异步和存储过程
Async and Stored Procedures

处理应用程序并发
Handling Concurrency

实现继承
Implementing Inheritance

高级EF功能
Advanced Entity Framework Scenarios

完整的数据模型

数据模型

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace ContosoUniversity.Models
{
public class Student
{
public int ID { get; set; }
[Required]
[StringLength(50)]
[Display(Name = "Last Name")]
public string LastName { get; set; }
[Required]
[StringLength(50, ErrorMessage = "First name cannot be longer than 50 characters.")]
[Column("FirstName")]
[Display(Name = "First Name")]
public string FirstMidName { get; set; }
[DataType(DataType.Date)]
[DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
[Display(Name = "Enrollment Date")]
public DateTime EnrollmentDate { get; set; }

[Display(Name = "Full Name")]
public string FullName
{
get
{
return LastName + ", " + FirstMidName;
}
}

public virtual ICollection<Enrollment> Enrollments { get; set; }
}
}

using System.ComponentModel.DataAnnotations;

namespace ContosoUniversity.Models
{
public enum Grade
{
A, B, C, D, F
}

public class Enrollment
{
public int EnrollmentID { get; set; }
public int CourseID { get; set; }
public int StudentID { get; set; }
[DisplayFormat(NullDisplayText = "No grade")]
public Grade? Grade { get; set; }

public virtual Course Course { get; set; }
public virtual Student Student { get; set; }
}
}

using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace ContosoUniversity.Models
{
public class Course
{
[DatabaseGenerated(DatabaseGeneratedOption.None)]
[Display(Name = "Number")]
public int CourseID { get; set; }

[StringLength(50, MinimumLength = 3)]
public string Title { get; set; }

[Range(0, 5)]
public int Credits { get; set; }

public int DepartmentID { get; set; }

public virtual Department Department { get; set; }
public virtual ICollection<Enrollment> Enrollments { get; set; }
public virtual ICollection<Instructor> Instructors { get; set; }
}
}

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace ContosoUniversity.Models
{
public class Instructor
{
public int ID { get; set; }

[Required]
[Display(Name = "Last Name")]
[StringLength(50)]
public string LastName { get; set; }

[Required]
[Column("FirstName")]
[Display(Name = "First Name")]
[StringLength(50)]
public string FirstMidName { get; set; }

[DataType(DataType.Date)]
[DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
[Display(Name = "Hire Date")]
public DateTime HireDate { get; set; }

[Display(Name = "Full Name")]
public string FullName
{
get { return LastName + ", " + FirstMidName; }
}

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

using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace ContosoUniversity.Models
{
public class OfficeAssignment
{
[Key]
[ForeignKey("Instructor")]
public int InstructorID { get; set; }
[StringLength(50)]
[Display(Name = "Office Location")]
public string Location { get; set; }

public virtual Instructor Instructor { get; set; }
}
}

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace ContosoUniversity.Models
{
public class Department
{
public int DepartmentID { get; set; }

[StringLength(50, MinimumLength=3)]
public string Name { get; set; }

[DataType(DataType.Currency)]
[Column(TypeName = "money")]
public decimal Budget { get; set; }

[DataType(DataType.Date)]
[DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
[Display(Name = "Start Date")]
public DateTime StartDate { get; set; }

public int? InstructorID { get; set; }

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