Question

我有以下代码。我没有使用过滤或搜索信息进行排序。我也没有使用skip方法。请参阅以下代码。

public ActionResult Index(string currentFilter=null, string search=null, string searchBy=null, int? page=1)
    {
        var student = from d in db.Student_vw
                      where d.is_active == true
                      select d;
        if (searchBy == "default")
        {
            student = student.OrderByDescending(x => x.ID_Number);
        }

        //searching of an item
        if (!String.IsNullOrEmpty(search))
        {
            student = student.Where(x => x.ID_Number.Contains(search) || x.student_fname.Contains(search)
                || x.student_lname.Contains(search) || x.section_name.Contains(search) || x.course_name.Contains(search)
                || x.student_address.Contains(search) || x.batch_name.Contains(search) || x.adviser_fname.Contains(search) || x.adviser_lname.Contains(search) || x.student_email_add.Contains(search));
        }
        else {
            student = student.OrderByDescending(x => x.ID_Number);
        }
        ViewBag.CurrentFilter = search;

        int pageSize = 25;
        int pageNumber = (page ?? 1);

        var returnMe = student.ToPagedList(pageNumber, pageSize);

        return View(returnMe);
    }

提前感谢您的帮助。

Answer 1

在你的代码中，当搜索有价值时，学生没有订购。如下所示

public ActionResult Index(string currentFilter=null, string search=null, string searchBy=null, int? page=1)
    {
        var student = from d in db.Student_vw
                      where d.is_active == true
                      select d;
        //if (searchBy == "default")
        //{
        //    student = student.OrderByDescending(x => x.ID_Number);
        //}

        //searching of an item
        if (!String.IsNullOrEmpty(search))
        {
            student = student.Where(x => x.ID_Number.Contains(search) || x.student_fname.Contains(search)
                || x.student_lname.Contains(search) || x.section_name.Contains(search) || x.course_name.Contains(search)
                || x.student_address.Contains(search) || x.batch_name.Contains(search) || x.adviser_fname.Contains(search) || x.adviser_lname.Contains(search) || x.student_email_add.Contains(search));
        }
        //else {
        //    student = student.OrderByDescending(x => x.ID_Number);
        //}
        ViewBag.CurrentFilter = search;

        int pageSize = 25;
        int pageNumber = (page ?? 1);

        var returnMe = student.OrderByDescending(x => x.ID_Number).ToPagedList(pageNumber, pageSize);

        return View(returnMe);
    }

Answer 2

@ Jen-你需要在student.ToPageList（pageNumber，pageSize）之前使用OrderBy

Answer 3

SQL不保证结果的顺序，除非你给它一个顺序，所以使用Take或Skip（PagedList在内部执行）没有顺序，没有任何逻辑意义，理论上可以每次给你完全不同的结果。

你编写逻辑的方式可以在没有按语句命令的情况下完成。

分页错误：方法＆＃39;跳过＆＃39;仅支持LINQ to Entities中的排序输入。方法＆＃39; OrderBy＆＃39;必须在方法之前调用＆＃39;跳过＆＃39;

3 个答案: