54 lines
1.7 KiB
C#
54 lines
1.7 KiB
C#
using System;
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using System.Linq;
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using NHibernate;
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using NHibernate.Criterion;
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using NHibernate.Criterion.Lambda;
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namespace Common
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{
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/// <summary>
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/// 扩展 IQueryOver
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/// </summary>
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public static class IQueryOverExtension
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{
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/// <summary>
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/// 扩展 IQueryOver.OrderBy
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/// </summary>
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/// <typeparam name="TRoot"></typeparam>
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/// <typeparam name="TSubType"></typeparam>
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/// <param name="source"></param>
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/// <param name="sort"></param>
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/// <param name="order"></param>
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/// <returns></returns>
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public static IQueryOver<TRoot, TSubType> OrderBy<TRoot, TSubType>(this IQueryOver<TRoot, TSubType> source, string sort, string order)
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{
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if (String.IsNullOrEmpty(sort)) {
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throw new ArgumentNullException("sort");
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}
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Type type = typeof(TRoot);
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if (type.GetProperties().Count(r => r.Name == sort) == 0) {
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throw new ArgumentException(String.Format("无效的参数值，{0}不是{1}的属性。", sort, type.Name), "sort");
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}
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if (String.IsNullOrEmpty(order)) {
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throw new ArgumentNullException("order");
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}
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bool ascending = true;
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if (String.Equals(order, "asc", StringComparison.OrdinalIgnoreCase)) {
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ascending = true;
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} else if (String.Equals(order, "desc", StringComparison.OrdinalIgnoreCase)) {
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ascending = false;
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} else {
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throw new ArgumentException("无效的参数值，取值范围 asc 或 desc 。", "order");
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}
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IQueryOverOrderBuilder<TRoot, TSubType> orderBuilder = source.OrderBy(Projections.Property(sort));
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return ascending ? orderBuilder.Asc : orderBuilder.Desc;
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}
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}
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}
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