c# - 如何正确使用 InsertAllOnSubmit() 是否比循环 InsertOnSubmit() 更好？

Question

假设我有:

using (SomeDataContext db = new SomeDataContext())
{

     foreach(Item i in Items)
     {
          DbItem d = new DbItem;
          d.value = i.value;
          //.... etc ...

          db.InsertOnSubmit(d);
     }

     db.SubmitChanges();
}

是否有可能和/或更好(更糟？):

using (SomeDataContext db = new SomeDataContext())
{
     IEnumerable<DbItem> dbItems = //???? possible?

     foreach(Item i in Items)
     {
          DbItem d = new DbItem;
          d.value = i.value;
          //.... etc ...

          dbItems.Add(d); // ???? again, somehow possible?
     }

     db.InsertAllOnSubmit(dbItems);
     db.SubmitChanges();
}

Answer 1

你可以使用 List<T> :

using (SomeDataContext db = new SomeDataContext())
{
     List<DbItem> dbItems = new List<DbItem>();

     foreach(Item i in Items)
     {
          DbItem d = new DbItem;
          d.value = i.value;
          //.... etc ...

          dbItems.Add(d);
     }

     db.InsertAllOnSubmit(dbItems);
     db.SubmitChanges();
}

这是否会更有效率，我不知道。