我正在学习 asp.net mvc 4 并遵循 Contoso 大学教程,我在第 3 部分,共 10 部分。http://www.asp.net/mvc/tutorials/getting-started-with-ef-using-mvc/sorting -在-an-asp-net-mvc-应用程序中使用实体框架进行过滤和分页
我的问题特别是关于过滤部分。我注意到当我有一个搜索字符串并单击搜索时,它会给我想要的结果。但是当我单击姓氏或注册对结果进行排序时,它会给我一个包括所有学生的排序列表。以下是控制器代码:
public ViewResult Index(string sortOrder, string searchString)
{
ViewBag.NameSortParm = String.IsNullOrEmpty(sortOrder) ? "name_desc" : "";
ViewBag.DateSortParm = sortOrder == "Date" ? "date_desc" : "Date";
var students = from s in db.Students
select s;
if (!String.IsNullOrEmpty(searchString))
{
students = students.Where(s =>s.LastName.ToUpper().Contains(searchString.ToUpper())
|| s.FirstMidName.ToUpper().Contains(searchString.ToUpper()));
}
switch (sortOrder)
{
case "name_desc":
students = students.OrderByDescending(s => s.LastName);
break;
case "Date":
students = students.OrderBy(s => s.EnrollmentDate);
break;
case "date_desc":
students = students.OrderByDescending(s => s.EnrollmentDate);
break;
default:
students = students.OrderBy(s => s.LastName);
break;
}
return View(students.ToList());
}
当我处于调试模式时,我注意到即使搜索框仍然包含原始搜索字符串,但传入控制器的 Index()d 的 searchString 为空。如何更改代码以便对过滤结果进行排序?谢谢!