只有LINQ to Entities中的排序输入才支持'Skip'方法

Question

什么可能导致这个问题？

public ActionResult Index(int page = 0)
{
    const int pageSize = 3;
    var areas = repo.FindAllAreas();
    var paginatedArea = new PaginatedList<Area>(areas, page, pageSize);

    return View(paginatedArea);
}


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace UTEPSA.Controllers
{
    class PaginatedList<T> : List<T>
    {
        public int PageIndex { get; private set; }
        public int PageSize { get; private set; }
        public int TotalCount { get; private set; }
        public int TotalPages { get; private set; }
        public PaginatedList(IQueryable<T> source, int pageIndex, int pageSize)
        {
            PageIndex = pageIndex;
            PageSize = pageSize;
            TotalCount = source.Count();
            TotalPages = (int)Math.Ceiling(TotalCount / (double)PageSize);
//ERROR HERE->>this.AddRange(source.Skip(PageIndex * PageSize).Take(PageSize));
        }
        public bool HasPreviousPage
        {
            get
            {
                return (PageIndex > 0);
            }
        }
        public bool HasNextPage
        {
            get
            {
                return (PageIndex + 1 < TotalPages);
            }
        }
    }
}

有什么建议？

Answer 1

似乎错误正是它所说的."仅允许在分类输入上跳过".正在搜索此错误,我发现了这一点.

如果在Skip之前包含OrderBy,则应该修复它:

source.orderBy(???).Skip(PageIndex * PageSize).Take(PageSize)); 

由于传递通用对象T,因此可能存在问题.您可能需要扩展类以接收另一个参数以按元素指示顺序.