We Keep Coding

ASP.NET MVC 5 Nullable boolean as dropdown - parameters

I have a nullable bool in my model
public bool? Property { get; set; }
And I render it via EditorFor
#Html.EditorFor(model => model.Property)
How can I add class form-control to rendered select and how can I localize strings Not set, True and False? Or better how can I replace them with custom strings?

#Html.DropDownListFor(m => m.Property, new SelectList(new[]
{
new SelectListItem { Value = null, Text = "Not set" },
new SelectListItem { Value = false, Text = "False" },
new SelectListItem { Value = true, Text = "True" },
},
"Value",
"Text"
),
new { #class = "form-control" })

You can try with below code:
#Html.DropDownListFor(m => m.Property,
new List<SelectListItem>(){
new SelectListItem { Value = "False", Text = "False" },
new SelectListItem { Value = "True", Text = "True" }
},"Not set",new { #class = "form-control" })

Is it possible to add hardcoded option/values in dropdownlist while retrieving a list from database ? MVC 5

I have this code that can retrieve a list from database in dropdownlist. I want to add hardcoded value or option to this.
Controller:
IEnumerable<SelectListItem> items = db.specimentype.Where(model => model.recordstatus == "active").ToList().Select(c => new SelectListItem
{
Value = c.code.ToString(),
Text = c.specimenType
});
ViewBag.specimentypelist = items;
View:
#Html.DropDownListFor(model => model.SpecimenType, new SelectList(ViewBag.specimentypelist, "Value", "Text", Model.SpecimenType), new { #class = "specimendropdown", #style = "height:27px; margin-left: 40px;" })
I want this to be
#Html.DropDownListFor(model => model.SpecimenType, new List<SelectListItem> { Text = "Horizontal", Value = "Horizontal" }, new SelectList(ViewBag.specimentypelist, "Value", "Text", Model.SpecimenType), new { #class = "specimendropdown", #style = "height:27px; margin-left: 40px;" })

You should move your list generation to the controller, like so for instance
model.SelectListOptions= new List<SelectListItem>
{ new SelectListItem() { Text = "DatabaseOption1", Selected = true, Value = "1"}
, new SelectListItem() { Text = "DatabaseOption2", Selected = false, Value = "2"}
, new SelectListItem() { Text = "AddedOption1", Selected = false, Value = "3"} };
And in your view, you can now reference it like so:
#Html.DropDownListFor(x => x.SpecimenType, Model.SelectListOptions, null, new { #class = "specimendropdown", #style = "height:27px; margin-left: 40px;", #disabled = "disabled" })
UPDATE
To account for your database retrieval, there's not much you need to do. You could add the SelectListItems to the list, like so:
IEnumerable<SelectListItem> items = db.specimentype.Where(model => model.recordstatus == "active").ToList().Select(c => new SelectListItem
{
Value = c.code.ToString(),
Text = c.specimenType
}).ToList();
items.Add(new SelectListItem() { Text = "AddedOption1", Selected = false, Value = "3"});
ViewBag.specimentypelist = items;
Just convert the IEnumerable to a List, and use the Add() method to append your options to the list you retrieve from the database.
You can also use the Insert method if you want to put them in at a specific place.

How to selected value true in dropdownlist MVC

i have problem in dropdownlist selected value.
View
#Html.DropDownList("QuestionType", (IEnumerable<SelectListItem>)ViewData["questiontype"], new { id = "QuestionType", #style = "max-width: 200px;width: 200px", #OnChange = "HideForm(this)", #class = "form-control" })
Controller
var questionTypeList = new SelectList(
new List<SelectListItem>
{
new SelectListItem { Value = "1", Text = "Automatic", Selected = false },
new SelectListItem { Value = "2", Text = "Custom", Selected = true}
}, "Value", "Text"
).ToList();
var questionType = new SelectList(questionTypeList, "Value", "Text");
ViewData["questiontype"] = questionType;
i want value=2 is selected true in view but my script above is not working, how can i solve this problem?
i have modified my code. i'm not using stronglytype which bind to dropdownlist. i'm using viewdata. this is my code:
Controller
List<SelectListItem> questionTypeList = new List<SelectListItem>();
questionTypeList.Add(new SelectListItem() { Text = "Automatic", Value = "1" });
questionTypeList.Add(new SelectListItem() { Selected = true, Text = "Custom", Value = "2" });
ViewData["questiontype"] = questionTypeList;
View
#Html.DropDownList("QuestionType", ViewData["questiontype"] as SelectList, new { id = "QuestionType", #style = "max-width: 200px;width: 200px", #OnChange = "HideForm(this)", #class = "form-control" })
why this code work and why previous code not work? i'm so confuse...

Not sure if you have a strongly typed view but you can use
DropdownlistFor(model=>model.QuestionType, selectlistItem)
then in your controller set
model.QuestionType to 2;
then
return View(model);

ASP.NET MVC Dropdown List From SelectList

I am building the following SelectList in my controller.
var u = new NewUser();
u.UserTypeOptions = new SelectList(new List<SelectListItem>
{
new SelectListItem { Selected = true, Text = string.Empty, Value = "-1"},
new SelectListItem { Selected = false, Text = "Homeowner", Value = ((int)UserType.Homeowner).ToString()},
new SelectListItem { Selected = false, Text = "Contractor", Value = ((int)UserType.Contractor).ToString()},
});
return u;
And displaying it on my view like this:
#Html.DropDownListFor(m => m.UserType, Model.UserTypeOptions)
It looks like I am giving it a valid set of SelectListItems in what should be a pretty straightforward dropdown list, but instead of getting a valid <option> list with good values and text, I get this:
<select data-val="true" data-val-range="A user type must be selected." data-val-range-max="2" data-val-range-min="1" data-val-required="The UserType field is required." id="UserType" name="UserType" class="input-validation-error">
<option>System.Web.Mvc.SelectListItem</option>
<option>System.Web.Mvc.SelectListItem</option>
<option>System.Web.Mvc.SelectListItem</option>
</select>
What gives? As far as I can tell, this should work.

You are missing setting the Text and Value field in the SelectList itself. That is why it does a .ToString() on each object in the list. You could think that given it is a list of SelectListItem it should be smart enough to detect this... but it is not.
u.UserTypeOptions = new SelectList(
new List<SelectListItem>
{
new SelectListItem { Selected = true, Text = string.Empty, Value = "-1"},
new SelectListItem { Selected = false, Text = "Homeowner", Value = ((int)UserType.Homeowner).ToString()},
new SelectListItem { Selected = false, Text = "Contractor", Value = ((int)UserType.Contractor).ToString()},
}, "Value" , "Text", 1);
BTW, you can use a list or array of any type... and then just set the name of the properties that will act as Text and Value.
I think it is better to do it like this:
u.UserTypeOptions = new SelectList(
new List<SelectListItem>
{
new SelectListItem { Text = "Homeowner", Value = ((int)UserType.Homeowner).ToString()},
new SelectListItem { Text = "Contractor", Value = ((int)UserType.Contractor).ToString()},
}, "Value" , "Text");
I removed the -1 item, and the setting of each item selected true/false.
Then, in your view:
#Html.DropDownListFor(m => m.UserType, Model.UserTypeOptions, "Select one")
This way, if you set the "Select one" item and don't set one item as selected in the SelectList, the UserType will be null (the UserType need to be int? ).
If you need to set one of the SelectList items as selected, you can use:
u.UserTypeOptions = new SelectList(options, "Value" , "Text", userIdToBeSelected);
As one of the users explained in the comments:
The 4th option of the SelectList constructor is ignored when binding to a property using DropDownListFor() - it is the property's value that determines what is selected.

Just try this in razor
#{
var selectList = new SelectList(
new List<SelectListItem>
{
new SelectListItem {Text = "Google", Value = "Google"},
new SelectListItem {Text = "Other", Value = "Other"},
}, "Value", "Text");
}
and then
#Html.DropDownListFor(m => m.YourFieldName, selectList, "Default label", new { #class = "css-class" })
or
#Html.DropDownList("ddlDropDownList", selectList, "Default label", new { #class = "css-class" })

Try this, just an example:
u.UserTypeOptions = new SelectList(new[]
{
new { ID="1", Name="name1" },
new { ID="2", Name="name2" },
new { ID="3", Name="name3" },
}, "ID", "Name", 1);
Or
u.UserTypeOptions = new SelectList(new List<SelectListItem>
{
new SelectListItem { Selected = true, Text = string.Empty, Value = "-1"},
new SelectListItem { Selected = false, Text = "Homeowner", Value = "2"},
new SelectListItem { Selected = false, Text = "Contractor", Value = "3"},
},"Value","Text");

var selectList = new List<SelectListItem>();
selectList.Add(new SelectListItem {Text = "Google", Value = "Google"}) ;
selectList.Add(new SelectListItem {Text = "Other", Value = "Other"}) ;

Selected value missed if use model in DropDownListFor()

I am having trouble this DropDownListFor()
I have test controller:
model.COUNTRYNAME = "Swizerland";
ViewBag.Selecter = new SelectList(new[]
{
new SelectListItem { Text = "USA", Value = "USA" },
new SelectListItem { Text = "Swizerland", Value = "Swizerland", Selected =true},
new SelectListItem { Text = "Russia", Value = "Russia" },
}, "Text", "Value", model.COUNTRYNAME);
in View
#Html.DropDownListFor(x => Model.COUNTRYNAME , (SelectList)ViewBag.Selecter)
The DropDownListFor does not have select value, it always select first value.
What is wrong?
If i use DropDownList
#Html.DropDownList("COUNTRYNAME" , (SelectList)ViewBag.Selecter)
It also don't work.
But if I use
#Html.DropDownListFor("AAAAAAA" , (SelectList)ViewBag.Selecter)
It's work fine and select 2nd value! What happens? I don't understand.
Thanks

Try like this:
model.COUNTRYNAME = "Swizeland";
ViewBag.Selecter = new[]
{
new SelectListItem { Text = "USA", Value = "USA" },
new SelectListItem { Text = "Swizeland", Value = "Swizeland" },
new SelectListItem { Text = "Russia", Value = "Russia" },
};
return View(model);
and in the view:
#Html.DropDownListFor(
x => x.COUNTRYNAME,
(IEnumerable<SelectListItem>)ViewBag.Selecter
)
but a better way is to use a view model:
model.SelectedCountry = "Swizeland";
model.Countries = new[]
{
new SelectListItem { Text = "USA", Value = "USA" },
new SelectListItem { Text = "Swizeland", Value = "Swizeland" },
new SelectListItem { Text = "Russia", Value = "Russia" },
};
return View(model);
and in the view:
#Html.DropDownListFor(x => x.SelectedCountry, Model.Countries)