src/Library/NetPro.Utility/Helpers/LinqHelper.cs

这里只显示每个文件的开头 60 行。登录后可以解锁完整代码。

微信扫码关注公众号，代码整理好后第一时间通知你。

using System.Linq;
using System.Linq.Expressions;
using System.Reflection;

namespace System.NetPro
{
    /// <summary>
    /// Linq帮助类
    /// </summary>
    public class LinqHelper
    {
        /// <summary>
        /// 排序
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="source"></param>
        /// <param name="sortExpression"></param>
        /// <param name="sortDirection"></param>
        /// <returns></returns>
        public static IQueryable<T> DataSorting<T>(IQueryable<T> source, string sortExpression, string sortDirection)
        {
            if (string.IsNullOrEmpty(sortExpression))
                return source;

            if (string.IsNullOrEmpty(sortDirection))
                return source;

            string sortingDir = string.Empty;
            if (sortDirection.ToUpper().Trim() == "ASC")
                sortingDir = "OrderBy";
            else if (sortDirection.ToUpper().Trim() == "DESC")
                sortingDir = "OrderByDescending";
            ParameterExpression param = Expression.Parameter(typeof(T), sortExpression);
            PropertyInfo pi = typeof(T).GetProperty(sortExpression);
            if (pi == null)
                return source;

            Type[] types = new Type[2];
            types[0] = typeof(T);
            types[1] = pi.PropertyType;
            Expression expr = Expression.Call(typeof(Queryable), sortingDir, types, source.Expression, Expression.Lambda(Expression.Property(param, sortExpression), param));
            IQueryable<T> query = source.AsQueryable().Provider.CreateQuery<T>(expr);
            return query;
        }

        /// <summary>
        /// 分页
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="source"></param>
        /// <param name="pageIndex"></param>
        /// <param name="pageSize"></param>
        /// <returns></returns>
        public static IQueryable<T> DataPaging<T>(IQueryable<T> source, int pageIndex, int pageSize)
        {
            if (pageIndex == 0)
                return source;

            if (pageIndex <= 1)
            {