默认情况下在SelectList中设置一个选定的值

Question

I want to set a selected value in my select list by default.

Here I have this select list :

@{
    var selectList = new SelectList(
        new List<SelectListItem>
        {
        new SelectListItem {Text = "Google", Value = "Google", Selected = false},
        new SelectListItem {Text = "Other", Value = "Other" , Selected = true},
        }, "Value", "Text");


   var selectedValue = "Other";
}

Here I'am trying to set "Other" is selected by default but it is not working for me why ?

Here the Dropdownlist:

@Html.DropDownList("ddlDropDownList", selectList, new { @class = "css-class" })

Answer 1

"Other" is not selected by default because you have not told the SelectList which option is selected. Variable selectedValue is assigned but used no where.

Simply, use this method signature

public SelectList (
  System.Collections.IEnumerable items,
  string dataValueField, 
  string dataTextField, 
  object selectedValue);

So your code in view will be

@{
        var selectList = new SelectList(
            new List<SelectListItem>
            {
               new SelectListItem {Text = "Google", Value = "Google", Selected = false},
               new SelectListItem {Text = "Other", Value = "Other" , Selected = true},
            }, "Value", "Text", "Other");

}

Pay attention that the last variable of the SelectList constructor is the selected value