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Net 分页功能的实现

發布時間：2024/4/14 编程问答 33 豆豆

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首先寫一個接口

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public interface IPagedList ????{ ????????int CurrentPageIndex { get; set; } ????????int PageSize { get; set; } ????????int TotalItemCount { get; set; } ????}

然后一個類去實現這個類

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public class PagedList<T> : List<T>,IPagedList ????{ ????????public PagedList(IList<T> items, int pageIndex, int pageSize) ????????{ ????????????PageSize = pageSize; ????????????TotalItemCount = items.Count; ????????????CurrentPageIndex = pageIndex; ????????????for (int i = StartRecordIndex - 1; i < EndRecordIndex; i++) ????????????{ ????????????????Add(items[i]); ????????????} ????????} ????????public PagedList(IEnumerable<T> items, int pageIndex, int pageSize, int totalItemCount) ????????{ ????????????AddRange(items); ????????????TotalItemCount = totalItemCount; ????????????CurrentPageIndex = pageIndex; ????????????PageSize = pageSize; ????????} ????????public int ExtraCount { get; set; } ????????public int CurrentPageIndex { get; set; } ????????public int PageSize { get; set; } ????????public int TotalItemCount { get; set; } ????????public int TotalPageCount { get { return (int)Math.Ceiling(TotalItemCount / (double)PageSize); } } ????????public int StartRecordIndex { get { return (CurrentPageIndex - 1) * PageSize + 1; } } ????????public int EndRecordIndex { get { return TotalItemCount > CurrentPageIndex * PageSize ? CurrentPageIndex * PageSize : TotalItemCount; } } ????}

那么最后，我們應該如何去調用這個 PagedList的呢？我們先寫一個拓展方法

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????public static class PageLinqExtensions ????{ ????????public static PagedList<T> ToPagedList<T> ????????????( ????????????????this IQueryable<T> allItems, ????????????????int pageIndex, ????????????????int pageSize ????????????) ????????{ ????????????if (pageIndex < 1) ????????????????pageIndex = 1; ????????????var itemIndex = (pageIndex - 1) * pageSize; ????????????var pageOfItems = allItems.Skip(itemIndex).Take(pageSize).ToList(); ????????????var totalItemCount = allItems.Count(); ????????????return new PagedList<T>(pageOfItems, pageIndex, pageSize, totalItemCount); ????????} ????}

然后調用的時候就可以這樣使用了

1 2	???? IQueryable<User> users ; ???? users.OrderByDescending(u => u.ID).ToPagedList(request.PageIndex, request.PageSize);

?來自?Net 分頁功能的實現

轉載于:https://www.cnblogs.com/qiao-xi/p/5594661.html

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