/// <summary> /// 从全量数据生成分页数据 /// </summary> /// <param name="source">源数据</param> /// <param name="para">分页数据</param> /// <returns>分页后的数据</returns> public static DataResult <T> ToODataResult <T>(this IQueryable <T> source, IODataParameter para) { Checker.NotNull(source, nameof(source)); Checker.CheckODataParameter(para, nameof(para)); int count = 0; if (para.Count) { count = source.Count(); } IList <T> result; if (para == null) { result = source.ToList(); } else { var orders = para.GetOrderings(); result = ODataQuery(source, para.Top, para.Skip, orders).ToList(); } return(new DataResult <T>() { Count = count, Result = result, }); }
/// <summary> /// 获得排序字段集合 /// </summary> /// <param name="para"></param> /// <returns></returns> public static IReadOnlyDictionary <string, Direction> GetOrderings(this IODataParameter para) { if (para is ODataParameter opara) { return(opara.Orderings); } return(ODataParameter.ToOrderingDictionary(para.OrderBy)); }
/// <summary> /// OData查询,支持 top, skip, orderby /// </summary> /// <typeparam name="T">数据源类型</typeparam> /// <param name="query">数据源</param> /// <param name="para">OData参数</param> /// <returns></returns> public static IQueryable <T> ODataQuery <T>(this IQueryable <T> query, IODataParameter para) { Checker.NotNull(query, nameof(query)); Checker.CheckODataParameter(para, nameof(para)); var orders = para.GetOrderings(); return(ODataQuery(query, para.Top, para.Skip, orders)); }
/// <summary> /// 检查 <see cref="IODataParameter"/> /// </summary> /// <param name="parameter"></param> /// <param name="paraName"></param> public static void CheckODataParameter(IODataParameter parameter, string paraName) { NotNull(parameter, paraName); if (parameter.Top < 0) { throw new ArgumentException(TopMustNonNegativeInteger); } if (parameter.Skip < 0) { throw new ArgumentException(SkipMustNonNegativeInteger); } }
/// <summary> /// 从全量数据生成OData数据 /// </summary> /// <param name="source"></param> /// <param name="para">分页数据</param> /// <param name="cancellationToken"><see cref="CancellationToken"/></param> /// <returns></returns> public static async Task <DataResult <T> > ToODataResultAsync <T>(this IQueryable <T> source, IODataParameter para, CancellationToken cancellationToken = default) { Checker.NotNull(source, nameof(source)); Checker.CheckODataParameter(para, nameof(para)); int count = 0; if (para.Count) { count = await source.CountAsync(cancellationToken); } if (para.Top <= 0) { return(new DataResult <T>() { Count = count, Result = Enumerable.Empty <T>().ToList(), }); } IList <T> result = await source.ODataQuery(para).ToListAsync(cancellationToken); return(new DataResult <T>() { Count = count, Result = result, }); }