1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4
5 namespace Microestc.PaginatedList
6 {
7 public class PaginatedList<TResult> : List<TResult>
8 {
9 public PaginatedList() : base() { }
10
11 public PaginatedList(IEnumerable<TResult> items, int totalCount, int pageIndex, int pageSize) : base(items)
12 {
13 TotalCount = totalCount;
14 PageCount = (totalCount + pageSize - 1) / pageSize;
15 PageIndex = pageIndex;
16 PageSize = pageSize;
17 HasPrev = pageIndex > 1;
18 HasNext = pageIndex < PageCount;
19 }
20
21 public virtual int TotalCount { get; private set; }
22
23 public virtual int PageCount { get; private set; }
24
25 public virtual int PageIndex { get; private set; }
26
27 public virtual int PageSize { get; private set; }
28
29 public virtual bool HasPrev { get; private set; }
30
31 public virtual bool HasNext { get; private set; }
32 }
33
34 public static class PaginatedListExtensions
35 {
36 public static PaginatedList<TResult> PaginatedList<TResult>(this IEnumerable<TResult> source, int pageIndex, int pageSize)
37 {
38 var count = source.Count();
39 var items = source.Skip((pageIndex - 1) * pageSize).Take(pageSize);
40 return new PaginatedList<TResult>(items, count, pageIndex, pageSize);
41 }
42
43 public static PaginatedList<TResult> PaginatedList<TSource, TResult>(this IEnumerable<TSource> source, Func<TSource, TResult> selector, int pageIndex, int pageSize)
44 {
45 var count = source.Count();
46 var items = source.Skip((pageIndex - 1) * pageSize).Take(pageSize).Select(selector);
47 return new PaginatedList<TResult>(items, count, pageIndex, pageSize);
48 }
49 }
50 }
