103 lines
No EOL
4 KiB
C#
103 lines
No EOL
4 KiB
C#
// ***********************************************************************
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// Assembly : FCS.Lib
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// Author : FH
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// Created : 2020-07-01
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//
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// Last Modified By : FH
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// Last Modified On : 2021-02-24
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// ***********************************************************************
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// <copyright file="QueryHelper.cs" company="Frede Hundewadt">
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// Copyright © FCS 2015-2022
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// </copyright>
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// <summary>
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// Implementation of https://stackoverflow.com/a/45761590
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// Part of FCS.Lib - a set of utilities for C# - pieced together from fragments
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// Copyright (C) 2021 FCS
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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// </summary>
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// ***********************************************************************
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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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using System.Reflection;
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namespace FCS.Lib
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{
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/// <summary>
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/// Class QueryHelper.
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/// </summary>
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public static class QueryHelper
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{
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/// <summary>
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/// Orders the by.
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/// </summary>
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/// <typeparam name="TModel">The type of the t model.</typeparam>
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/// <param name="q">The q.</param>
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/// <param name="name">The name.</param>
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/// <param name="desc">if set to <c>true</c> [desc].</param>
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/// <returns>IQueryable<TModel>.</returns>
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public static IQueryable<TModel> OrderBy<TModel>(this IQueryable<TModel> q, string name, bool desc)
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{
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var entityType = typeof(TModel);
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var p = entityType.GetProperty(name);
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var m = typeof(QueryHelper).GetMethod("OrderByProperty")?.MakeGenericMethod(entityType, p.PropertyType);
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return (IQueryable<TModel>)m.Invoke(null, new object[] { q, p, desc });
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}
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/// <summary>
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/// Thens the by.
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/// </summary>
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/// <typeparam name="TModel">The type of the t model.</typeparam>
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/// <param name="q">The q.</param>
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/// <param name="name">The name.</param>
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/// <param name="desc">if set to <c>true</c> [desc].</param>
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/// <returns>IQueryable<TModel>.</returns>
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public static IQueryable<TModel> ThenBy<TModel>(this IQueryable<TModel> q, string name, bool desc)
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{
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var entityType = typeof(TModel);
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var p = entityType.GetProperty(name);
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var m = typeof(QueryHelper).GetMethod("OrderByProperty")?.MakeGenericMethod(entityType, p.PropertyType);
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return (IQueryable<TModel>)m.Invoke(null, new object[] { q, p, desc });
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}
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/// <summary>
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/// Orders the by property.
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/// </summary>
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/// <typeparam name="TModel">The type of the t model.</typeparam>
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/// <typeparam name="TRet">The type of the t ret.</typeparam>
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/// <param name="q">The q.</param>
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/// <param name="p">The p.</param>
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/// <param name="desc">if set to <c>true</c> [desc].</param>
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/// <returns>IQueryable<TModel>.</returns>
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public static IQueryable<TModel> OrderByProperty<TModel, TRet>(IQueryable<TModel> q, PropertyInfo p, bool desc)
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{
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var pe = Expression.Parameter(typeof(TModel));
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Expression se = Expression.Convert(Expression.Property(pe, p), typeof(object));
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var exp = Expression.Lambda<Func<TModel, TRet>>(se, pe);
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return desc ? q.OrderByDescending(exp) : q.OrderBy(exp);
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}
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}
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} |