分享一个C#的分页类建议收藏

 1 using System.Linq;
 2 using System.Collections.Generic;
 3 
 4 namespace CommonLibrary
 5 {
 6     public class PagedList<T> : List<T>
 7     {
 8         #region Properties
 9 
10         public int PageIndex { get; private set; }
11 
12         public int PageSize { get; private set; }
13 
14         public int TotalCount { get; private set; }
15 
16         public int TotalPages { get; private set; }
17 
18         public bool HasPreviousPage
19         {
20             get { return (PageIndex > 0); }
21         }
22         public bool HasNextPage
23         {
24             get { return (PageIndex + 1 < TotalPages); }
25         }
26 
27         #endregion
28        //http://www.cnblogs.com/roucheng/
29         #region Constructors
30 
31         public PagedList(IQueryable<T> source, int pageIndex, int pageSize)
32         {
33             if (source == null || source.Count() < 1)
34                 throw new System.ArgumentNullException("source");
35 
36             int total = source.Count();
37             this.TotalCount = total;
38             this.TotalPages = total / pageSize;
39 
40             if (total % pageSize > 0)
41                 TotalPages++;
42 
43             this.PageSize = pageSize;
44             this.PageIndex = pageIndex;
45             this.AddRange(source.Skip(pageIndex * pageSize).Take(pageSize).ToList());
46         }
47 
48         public PagedList(IList<T> source, int pageIndex, int pageSize)
49         {
50             if (source == null || source.Count() < 1)
51                 throw new System.ArgumentNullException("source");
52 
53             TotalCount = source.Count();
54             TotalPages = TotalCount / pageSize;
55 
56             if (TotalCount % pageSize > 0)
57                 TotalPages++;
58 
59             this.PageSize = pageSize;
60             this.PageIndex = pageIndex;
61             this.AddRange(source.Skip(pageIndex * pageSize).Take(pageSize).ToList());
62         }
63 
64         public PagedList(IEnumerable<T> source, int pageIndex, int pageSize, int totalCount)
65         {
66             if (source == null || source.Count() < 1)
67                 throw new System.ArgumentNullException("source");
68 
69             TotalCount = totalCount;
70             TotalPages = TotalCount / pageSize;
71 
72             if (TotalCount % pageSize > 0)
73                 TotalPages++;
74 
75             this.PageSize = pageSize;
76             this.PageIndex = pageIndex;
77             this.AddRange(source);
78         }
79 
80         #endregion
81     }
82 }