27 lines
1.2 KiB
C#
27 lines
1.2 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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namespace AGSS.Utilities;
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public static class LINQ
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{
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/// <summary>
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/// 从给定的序列中分页获取元素。
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/// </summary>
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/// <typeparam name="T">序列中的元素类型。</typeparam>
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/// <param name="source">要从中分页的源序列。</param>
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/// <param name="pageIndex">请求的页码，从0开始。</param>
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/// <param name="pageSize">每页包含的元素数量。</param>
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/// <returns>返回指定页码和页大小对应的子序列。</returns>
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/// <exception cref="ArgumentNullException">如果source为null。</exception>
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/// <exception cref="ArgumentOutOfRangeException">如果pageIndex是负数或者pageSize是非正数。</exception>
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public static IEnumerable<T> Paginate<T>(this IEnumerable<T> source, int pageIndex, int pageSize)
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{
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if (source == null) throw new ArgumentNullException(nameof(source));
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if (pageIndex < 0) throw new ArgumentOutOfRangeException(nameof(pageIndex), "Page index must be non-negative.");
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if (pageSize <= 0) throw new ArgumentOutOfRangeException(nameof(pageSize), "Page size must be positive.");
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return source.Skip(pageIndex * pageSize).Take(pageSize);
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}
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} |