IQueryable簡單分頁的擴展方法 ,廢話不多說,直接上乾貨!
/// <summary> /// 分頁列表 /// </summary> public class Page<T> { public Page() { } public Page(List<T> items, int pageIndex, int pageSize, int totalCount) { PageIndex = pageIndex; PageSize = pageSize; Total = totalCount; PageTotal = (int)Math.Ceiling(totalCount / (double)pageSize); Items = items; } /// <summary> /// 當前頁碼 /// </summary> public int PageIndex { get; set; } /// <summary> /// 每頁記錄數 /// </summary> public int PageSize { get; set; } /// <summary> /// 總記錄數 /// </summary> public int Total { get; set; } /// <summary> /// 總頁數 /// </summary> public int PageTotal { get; set; } /// <summary> /// 分頁數據 /// </summary> public List<T> Items { get; set; } }
public static class PagedListExtensions { /// <summary> /// PagedList /// </summary> /// <param name="query"></param> /// <param name="pageIndex">1爲起始頁</param> /// <param name="pageSize"></param> /// <param name="cancellationToken"></param> public static async Task<Page<T>> ToPagedListAsync<T>( this IQueryable<T> query, int pageIndex, int pageSize, CancellationToken cancellationToken = default) { if (pageIndex < 1) throw new ArgumentOutOfRangeException(nameof(pageIndex)); int realIndex = pageIndex - 1; int count = await query.CountAsync(cancellationToken).ConfigureAwait(false); var items = await query.Skip(realIndex * pageSize) .Take(pageSize) .ToListAsync(cancellationToken) .ConfigureAwait(false); return new Page<T>(items, pageIndex, pageSize, count); } public static Page<T> ToPagedList<T>( this IQueryable<T> query, int pageIndex, int pageSize) { if (pageIndex < 1) throw new ArgumentOutOfRangeException(nameof(pageIndex)); int realIndex = pageIndex - 1; int count = query.Count(); var items = query.Skip(realIndex * pageSize) .Take(pageSize) .ToList(); return new Page<T>(items, pageIndex, pageSize, count); } }