获取下拉列表用于在ASP.NET MVC中显示选定的值

Question

I have a DropDownListFor is like this below

  @Html.DropDownListFor(m => m._dayOfWeek, new SelectList(Model._dayOfWeekList, "Value", "Text"))

in Model 

_dayOfWeek is string
_dayOfWeekList is List<selectlistItem>

now in dayOfWeekList is getting created in controller and it can have many values but max seven values

Value - 0 Text - Monday

Value - 1 Text - Tuesday

Value - 2 Text - Wednesday

and so on ...

now in _dayOfWeek string i can assign value or text - depending on the value in _dayOfWeek --- the dropdown should be able to show that option

when the page is loaded drop down is always showing Monday as default .

how to make the drop down show that option which is there in _dayOfWeek string

Answer 1

First, don't create a new SelectList . Razor can handle this itself, and it's better to let it. All DropDownListFor requires is IEnumerable<SelectListItem> , which you already have:

@Html.DropDownListFor(m => m._dayOfWeek, Model._dayOfWeekList)

Second, the value assigned is determined based on ModelState , which is composed of values from Request , ViewData / ViewBag and, as a last resort, Model . As a result, you should ensure that your view's model has the appropriate value set for that property and that it aligns with the possible option values in your List<SelectListItem> . Then, ensure that you do not have any conflicts from accepting a param like _dayOfWeek to your action method or something like ViewBag._dayOfWeek being set to some value. In both cases, casing does not matter, so _dayOfWeek == _DayOfWeek == _DAYOFWEEK .

Answer 2

Ok I got the answer to that . without using viewbag or viewdata

       foreach (var item in model._dayOfWeekList)
        {
          if (item.Text == model._dayOfWeek)
         {
               item.Selected = true;
            }

        }

thnaks to others also for their time