SelectList根本没有排序

Question

public static SelectList HolidayDays() 
{ 
    SelectList retval = GenerateKeyValueList<HolidayCity>(HolidayCityHelper.GetFriendlyName, HolidayCity.NotSet); 

    //sort 
    retval.OrderBy(i => i.Text == "New York") 
      .ThenBy(i => i.Text == "London") 
      .ThenBy(i => i.Text); 

    return retval; 
} 

为什么SelectList没有排序呢？它保持与我在执行排序操作之前所处的顺序完全相同，但它编译并运行时没有错误。

Answer 1

OrderBy和ThenBy返回一个集合，你没有设置你的返回值;

---

SelectList retval = GenerateKeyValueList<HolidayCity>(HolidayCityHelper.GetFriendlyName, HolidayCity.NotSet); 

return new SelectList(retval 
     .OrderByDescending(i => i.Text == "New York") 
     .ThenByDescending(i => i.Text == "London") 
     .ThenBy(i => i.Text).ToList(), 
    "Value", "Text");