83 lines
2.6 KiB
C#
83 lines
2.6 KiB
C#
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using System;
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using System.Linq;
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using System.Linq.Expressions;
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namespace APT.Infrastructure.Core
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{
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/// <summary>
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/// Linq架构里对集合排序实现
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/// </summary>
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/// <typeparam name="T"></typeparam>
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public class Orderable<T> : IOrderable<T>
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{
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private IQueryable<T> _queryable;
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/// <summary>
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/// 排序后的结果集
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/// </summary>
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/// <param name="enumerable"></param>
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public Orderable(IQueryable<T> enumerable)
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{
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_queryable = enumerable;
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}
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/// <summary>
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/// 排序之后的结果集
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/// </summary>
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public IQueryable<T> Queryable
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{
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get { return _queryable; }
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}
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/// <summary>
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/// 递增
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/// </summary>
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/// <typeparam name="TKey"></typeparam>
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/// <param name="keySelector"></param>
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/// <returns></returns>
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public IOrderable<T> Asc<TKey>(Expression<Func<T, TKey>> keySelector)
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{
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_queryable = (_queryable as IOrderedQueryable<T>)
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.OrderBy(keySelector);
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return this;
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}
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/// <summary>
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/// 然后递增
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/// </summary>
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/// <typeparam name="TKey"></typeparam>
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/// <param name="keySelector"></param>
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/// <returns></returns>
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public IOrderable<T> ThenAsc<TKey>(Expression<Func<T, TKey>> keySelector)
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{
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_queryable = (_queryable as IOrderedQueryable<T>)
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.ThenBy(keySelector);
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return this;
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}
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/// <summary>
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/// 递减
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/// </summary>
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/// <typeparam name="TKey"></typeparam>
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/// <param name="keySelector"></param>
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/// <returns></returns>
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public IOrderable<T> Desc<TKey>(Expression<Func<T, TKey>> keySelector)
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{
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_queryable = _queryable
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.OrderByDescending(keySelector);
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return this;
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}
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/// <summary>
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/// 然后递减
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/// </summary>
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/// <typeparam name="TKey"></typeparam>
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/// <param name="keySelector"></param>
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/// <returns></returns>
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public IOrderable<T> ThenDesc<TKey>(Expression<Func<T, TKey>> keySelector)
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{
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_queryable = (_queryable as IOrderedQueryable<T>)
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.ThenByDescending(keySelector);
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return this;
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}
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}
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}
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