【译】第42节---EF6-DbSet.AddRange & DbSet.RemoveRange

原文：http://www.entityframeworktutorial.net/entityframework6/addrange-removerange.aspx

EF 6中的DbSet引入了新的方法AddRange＆RemoveRange。

DbSet.AddRange将实体的集合（IEnumerable）添加到DbContext，不必单独添加每个实体。

IList<Student> newStudents = new List<Student>();
newStudents.Add(new Student() { StudentName = "Student1 by addrange" });
newStudents.Add(new Student() { StudentName = "Student2 by addrange" });
newStudents.Add(new Student() { StudentName = "Student3 by addrange" });
               
using (var context = new SchoolDBEntities())
{
    context.Students.AddRange(newStudents);
    context.SaveChanges();
}

类似的，DbSet.RemoveRange用于从DbSet中删除实体的集合。

IList<Student> existingStudents = …..
    
using (var context = new SchoolDBEntities())
{
    context.Students.RemoveRange(existingStudents);
        context.SaveChanges();
}