entityFramework使用 codefirst

    //[Table("Customers")]
    public class Customer
    {
        //[Key]
        public System.Guid Id { get; set; }
        public int Number { get; set; }
        public string Name { get; set; }
        public System.DateTime RegDate { get; set; }
    }

    public class CrmDbContext : DbContext
    {

        public CrmDbContext()
            : base("Crm")
        {
        }

        public DbSet<Customer> Customers { get; set; }

    }

1. 1. 　　　　      context.Customers.AddOrUpdate(
                    p => p.Id,
                    new Customer { Number = 1001, Name = "丛平", RegDate = Convert.ToDateTime("2015/05/31") }
                  );

1. 　　<?xml version="1.0" encoding="utf-8"?>
   <configuration>
       <connectionStrings>
           <add name="Crm" connectionString="Data Source=.;Initial Catalog=CrmDB;Integrated Security=True;MultipleActiveResultSets=True"
               providerName="System.Data.SqlClient" />
       </connectionStrings>
   </configuration>
2. 执行Update-Database，自动创建数据库，建立表和数据。