public void AddCourse(string name, int credits)
{
var course = new Course()
{
CourseId = 1, Name = name, Credits = credits
};
using (var dbcontext = new CodeFirstDBContext())
{
dbcontext.Courses.Add(course);
dbcontext.SaveChanges();
}
}
/// <summary>
/// 使用CodeFirst时，如果第一次创建生成了数据库，之后再增加实体类，直接执行的话，就会报异常，说是数据迁移问题。具体看看https://docs.microsoft.com/zh-cn/ef/ef6/modeling/code-first/migrations/index 这个是完整的EF教程
/// </summary>
/// <param name="args"></param>
static void Main(string[] args)
{
CodeFirstDBContext dbcontext = new CodeFirstDBContext();
dbcontext.Database.CreateIfNotExists();
UserInfo userInfo = new UserInfo();
userInfo.UserName = "******";
userInfo.Email = "aaa";
dbcontext.UserInfo.Add(userInfo);
dbcontext.SaveChanges();
Console.Write("成功");
Console.ReadKey();
}
static void Main(string[] args)
{
using (var context = new CodeFirstDBContext())
{
var Student = new Student()
{
Name = "Paul"
};
context.Students.Add(Student);
context.SaveChanges();
}
Console.ReadKey();
/*
* (1) Enable-Migrations
* (2) Add-Migration Version_Name -ConnectionString "data source=.\sqlexpress;initial catalog=codefirstDB;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework" -ConnectionProviderName "System.Data.SqlClient" -Verbose
*
* (3) Update-Database -ConnectionString "data source=.\sqlexpress;initial catalog=codefirstDB;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework" -ConnectionProviderName "System.Data.SqlClient" -Verbose
*
*/
}