static void Delete()
{
var student = new Student
{
Id = 2
};
using (var ctx = new EFCoreDemoDbContext())
{
ctx.Student.Remove(student);
//or the followings are also valid
//ctx.Remove<Student>(student);
//ctx.Attach<Student>(student).State = EntityState.Deleted;
//ctx.Entry<Student>(student).State = EntityState.Deleted;
ctx.SaveChanges();
}
}
static void Update()
{
var student = new Student
{
Id = 1,
FirstName = "zhang",
LastName = "san_new"
};
using (var ctx = new EFCoreDemoDbContext())
{
ctx.Student.Update(student);
//or the followings are also valid
//ctx.Update<Student>(student);
//ctx.Student.Attach(student).State = EntityState.Modified;
//ctx.Entry<Student>(student).State = EntityState.Modified;
ctx.SaveChanges();
}
}
static void Add()
{
var student = new Student
{
FirstName = "xi",
LastName = "jp"
};
using (var ctx = new EFCoreDemoDbContext())
{
ctx.Attach <Student>(student);
//or
//ctx.Entry<Student>(student).State = EntityState.Added;
//or
//ctx.Student.Add(student);
//or
//ctx.Add<Student>(student);
ctx.SaveChanges();
}
}