工具：vs2019   sql server2012

链接sqlserver，创建数据库 NewMvc

在web.config下编写连接字符串（ConnectionString）

<connectionStrings>
    <add name="conn" connectionString="data source=.;initial catalog=NewMvc;integrated security=True;" providerName="System.Data.SqlClient" />
  </connectionStrings>

添加ef引用  nuget包   Entity Framework 安装

新建实体类Employee.cs

 public class Employee
    {
        [Key]
        public int EmployeeId { get; set; }
        
        public string FirstName { get; set; }
        
        public string LastName { get; set; }
        public int Salary { get; set; }
    }

新建实体操作类SalesERPDAL.cs    PS：要继承DbContext

 public class SalesERPDAL:DbContext
    {
        public SalesERPDAL() : base("conn")
        { 
        
        }
        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Entity<Employee>().ToTable("TblEmployee");//表名称
            base.OnModelCreating(modelBuilder);
        }
        public DbSet<Employee> employees { get; set; }//DbSet表示数据库中能够被查询的所有Employee
    }

调用就实例化操作类new SalesERPDAL

我们随便写个list来看看能不能拿到数据

 public List<Employee> GetEmployees()
        {
            SalesERPDAL salesDal = new SalesERPDAL();
             return salesDal.employees.ToList();
        }

　启动网站后会自动生成数据表

asp.net mvc结合EF