103 lines
2.9 KiB
C#
103 lines
2.9 KiB
C#
namespace Szmedi.RvKits.FamilyTools
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{
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public class PageInfo<T>
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{
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private readonly int pageSize;
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public List<T> dataSource;
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public int CurrentIndex { get; set; }
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public int Pagecount { get; set; }
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public PageInfo()
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{
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//当前页码
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CurrentIndex = 1;
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}
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public PageInfo(List<T> dataSource, int pageSize)
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: this()
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{
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this.dataSource = dataSource;
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//每页的数目
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this.pageSize = pageSize;
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//取商
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Pagecount = dataSource.Count / pageSize;
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//如果整除+0，不整除+1
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Pagecount += dataSource.Count % pageSize != 0 ? 1 : 0;
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}
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public List<T> GetPageData(JumpOperation jo)
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{
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switch (jo)
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{
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case JumpOperation.GoHome:
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CurrentIndex = 1;
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break;
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case JumpOperation.GoPrePrevious:
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if (CurrentIndex > 1)
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{
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CurrentIndex -= 1;
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}
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break;
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case JumpOperation.GoNext:
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if (CurrentIndex < Pagecount)
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{
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CurrentIndex += 1;
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}
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break;
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case JumpOperation.GoEnd:
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CurrentIndex = Pagecount;
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break;
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case JumpOperation.GoAny:
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break;
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}
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List<T> listPageData = new();
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try
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{
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int pageCountTo = pageSize;
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//页数等于1并且取余大于0（即只有一页时）
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if (Pagecount == CurrentIndex && dataSource.Count % pageSize > 0)
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{
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//pageCountTo=当前条目数
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pageCountTo = dataSource.Count % pageSize;
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}
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if (null != dataSource)
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{
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for (int i = 0; i < pageCountTo; i++)
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{
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//当前页码-1进行循环，比如有32项时，当前第2页，即从Index=20（第一项Index=0）开始循环
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if (((CurrentIndex - 1) * pageSize) + i < dataSource.Count)
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{
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//将该项添加到listPageData
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listPageData.Add(dataSource[((CurrentIndex - 1) * pageSize) + i]);
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}
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else
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{
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break;
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}
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}
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}
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return listPageData;
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}
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catch
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{
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return listPageData;
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}
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}
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}
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public enum JumpOperation
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{
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GoHome = 0,
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GoPrePrevious = 1,
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GoNext = 2,
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GoEnd = 3,
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GoAny = 4
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}
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} |