Selecting first 10 records, then next 10, paging using Linq

Question

How select first 10 records, Then the next 10, Then the next 10, and so long as the array will not end.

Phrases = bannersPhrases.Select(x=>x.Phrase).Take(10).ToArray()

How get the next 10 records?

Answer 1

var total = bannersPhrases.Select(p => p.Phrase).Count();
var pageSize = 10; // set your page size, which is number of records per page

var page = 1; // set current page number, must be >= 1 (ideally this value will be passed to this logic/function from outside)

var skip = pageSize * (page-1);

var canPage = skip < total;

if (!canPage) // do what you wish if you can page no further
   return;

Phrases = bannersPhrases.Select(p => p.Phrase)
             .Skip(skip)
             .Take(pageSize)
             .ToArray();

Answer 2

If you are doing paging and you just want to skip to a particular page you can use Skip and Take as described in some of the other answers. However, if you want group the entire sequence into chunks of a particular size you can use GroupBy instead. Here is a small example:

var groupSize = 4;
// The characters 'a' - 'z'.
var source = Enumerable.Range(0, 26).Select(i => (Char) ('a' + i));
var groups = source
  .Select((x, i) => new { Item = x, Index = i })
  .GroupBy(x => x.Index/groupSize, x => x.Item);
foreach (var group in groups)
  Console.WriteLine("{0}: {1}", group.Key, String.Join(", ", group));

The output is:

0: a, b, c, d
1: e, f, g, h
2: i, j, k, l
3: m, n, o, p
4: q, r, s, t
5: u, v, w, x
6: y, z

Answer 3

You can use .Skip() .This will return the next 10 items:

 Phrases = bannersPhrases.Select(x=>x.Phrase).Skip(10).Take(10).ToArray()

Answer 4

You can use Skip extension method

Phrases = bannersPhrases.Select(x=>x.Phrase).Skip(10).Take(10).ToArray()