asp.net mvc dropdown box html.dropdownlist and Dropdownlistfor Common methods _ Practical Tips

First, not strong type:

Controller:
viewdata["Areid"] = from A in Rp. Getarea ()
Select New SelectListItem {
Text=a.areaname,
Value=a.areaid.tostring ()
};
View:
@Html. DropDownList ("Areid")

You can also add a default option to it: @Html. DropDownList ("Areid", "Please select");

Second, strong type:

Dropdownlistfor is commonly used as an overload of two parameters, the first parameter is the name of the generated select, and the second parameter is data that is used to bind the bound data source to the Dropdownlistfor

Modle:

public class Settingsviewmodel
{
Repository RP =new Repository ();
public string ListName {get; set;}
Public ienumerable<selectlistitem> getselectlist ()
{
var selectlist = Rp. Getarea (). Select (a => new SelectListItem {
Text=a.areaname,
Value=a.areaid.tostring ()
});
return selectlist;
}
}

Controller:
Public ActionResult Index ()
{
Return View (New Settingsviewmodel ());
}

View:
@model Mvc3Applicationtest2.Models.SettingsViewModel
@Html. Dropdownlistfor (M=>m.listname,model.getselectlist (), "Please select")