Doc.Utility/CollectionPropertySorter.cs

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using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using System.Text;

namespace Doc.Utility
{

    /// <summary>
    /// 集合类型字符串排序操作类
    /// </summary>
    /// <typeparam name="T">集合项类型</typeparam>
    public static class CollectionPropertySorter<T>
    {
        // ReSharper disable StaticFieldInGenericType
        private static readonly ConcurrentDictionary<string, LambdaExpression> Cache = new ConcurrentDictionary<string, LambdaExpression>();

        /// <summary>
        /// 按指定的属性名称对<see cref="IEnumerable{T}"/>序列进行排序
        /// </summary>
        /// <param name="source"><see cref="IEnumerable{T}"/>序列</param>
        /// <param name="propertyName">属性名称</param>
        /// <param name="sortDirection">排序方向</param>
        public static IOrderedEnumerable<T> OrderBy(IEnumerable<T> source, string propertyName, ListSortDirection sortDirection)
        {

            dynamic expression = GetKeySelector(propertyName);
            dynamic keySelector = expression.Compile();
            return sortDirection == ListSortDirection.Ascending
                ? Enumerable.OrderBy(source, keySelector)
                : Enumerable.OrderByDescending(source, keySelector);
        }

        /// <summary>
        /// 按指定的属性名称对<see cref="IOrderedEnumerable{T}"/>进行继续排序
        /// </summary>
        /// <param name="source"><see cref="IOrderedEnumerable{T}"/>序列</param>
        /// <param name="propertyName">属性名称</param>
        /// <param name="sortDirection">排序方向</param>
        public static IOrderedEnumerable<T> ThenBy(IOrderedEnumerable<T> source, string propertyName, ListSortDirection sortDirection)
        {
            dynamic expression = GetKeySelector(propertyName);
            dynamic keySelector = expression.Compile();
            return sortDirection == ListSortDirection.Ascending
                ? Enumerable.ThenBy(source, keySelector)
                : Enumerable.ThenByDescending(source, keySelector);
        }

        /// <summary>
        /// 按指定的属性名称对<see cref="IQueryable{T}"/>序列进行排序
        /// </summary>
        /// <param name="source">IQueryable{T}序列</param>
        /// <param name="propertyName">属性名称</param>
        /// <param name="sortDirection">排序方向</param>
        /// <returns></returns>
        public static IOrderedQueryable<T> OrderBy(IQueryable<T> source, string propertyName, ListSortDirection sortDirection)