如何使用LINQ将表列查询到数组中

Question

I am just trying to use multiselect options in MVC by using ListBoxFor. I created my viewmodel and passing that viewmodel to view. But I found out that I need to create an array list to pass to view and when the results is posted back to controller I will be able to find out what has been selected and save those in the table. So I have a table called ArtistTypes and I would like to get the array list of artistTypeID from this table and pass it to view. I cannot figure it out how to query it to an array?

int[] selectedIds = _db.ArtistTypes.ToList().Select(x=> new int[]???);

Answer 1

用这个

int[] selectedIds = _db.ArtistTypes.Select(x=> x.artistTypeID).ToArray();

Answer 2

You can just accomplish by

int[] selectedIds = A.Select(x => x.ArtistId).ToArray();

But i will recommend you to use this

IEnumerable<int> selectedIds = A.Select(x => x.ArtistId);

because an Array also implement IEnumerable .