对List共用分页

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非SQL分页

/// <summary>
/// 公共帮助类
/// </summary>
public class CommanHelper<T> where T : new()
{
/// <summary>
/// 公共数据分页
/// </summary>
/// <typeparam name="T">数据类型泛型</typeparam>
/// <param name="source">源数据</param>
/// <param name="pagesize">页码</param>
/// <param name="pageindex">页数</param>
/// <param name="pagecount">多少页</param>
/// <returns>分页结果</returns>
public static List<T> Pager(List<T> source, int pagesize, int pageindex, out int pagecount)
{
List<T> newlist = new List<T>();
int totle = source.Count;
for (int i = 0; i < totle; i++)
{
if (i >= (pageindex - 1) * pagesize && i < pageindex * pagesize)
{
newlist.Add(source[i]);
}
}
pagecount = totle % pagesize == 0 ? totle / pagesize : totle / pagesize + 1;
return newlist;
}
/// <summary>
/// 公共数据分页
/// </summary>
/// <typeparam name="T">泛型</typeparam>
/// <param name="source">数据源</param>
/// <param name="pagesize">一页大小</param>
/// <param name="pageindex">页码</param>
/// <param name="sortby">排序字段</param>
/// <param name="sortType">排序类型</param>
/// <param name="pagecount">页数</param>
/// <returns></returns>
public static List<T> Pager(List<T> source, int pagesize, int pageindex, string sortby, SortType sortType, out int pagecount)
{
switch (sortType)
{
case SortType.Asc:
source = SortAsc(source, sortby);
break;
case SortType.Desc:
source = SortDesc(source, sortby);
break;
default:
source = SortAsc(source, sortby);
break;
}
return Pager(source, pagesize, pageindex, out pagecount);
}
/// <summary>
/// 公共数据分页
/// 默认从小到大
/// </summary>
/// <typeparam name="T">泛型</typeparam>
/// <param name="source">数据源</param>
/// <param name="pagesize">一页大小</param>
/// <param name="pageindex">页码</param>
/// <param name="sortby">排序字段</param>
/// <param name="pagecount">页数</param>
/// <returns></returns>
public static List<T> Pager(List<T> source, int pagesize, int pageindex, string sortby, out int pagecount)
{
return Pager(source, pagesize, pageindex, sortby, SortType.Asc, out pagecount);
}

/// <summary>
/// 公共排序单列排序
/// 从小到大
/// </summary>
/// <typeparam name="T">泛型</typeparam>
/// <param name="source">源文件</param>
/// <param name="sortby">排序字段</param>
/// <returns></returns>
public static List<T> SortAsc(List<T> source, string sortby)
{
List<T> tlist = source.OrderBy(x => x.GetType().GetProperty(sortby).GetValue(x, null)).ToList<T>();
return tlist;
}
/// <summary>
/// 公共排序单列排序
/// 从大到小
/// </summary>
/// <typeparam name="T">泛型</typeparam>
/// <param name="source">源文件</param>
/// <param name="sortby">排序字段</param>
/// <returns></returns>
public static List<T> SortDesc(List<T> source, string sortby)
{
List<T> tlist = source.OrderByDescending(x => x.GetType().GetProperty(sortby).GetValue(x, null)).ToList<T>();
return tlist;
}
}
/// <summary>
/// 排序类型
/// </summary>
public enum SortType
{
Asc,
Desc
}

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