Save selected item from dropdownlist in asp.net mvc

Question

I'm trying to save the selected item from my dropdownlist menu in a MSSQL table where the menu is populated from another MSSQL table. But whenever I run my project I get compilation error,

CS1502: The best overloaded method match for 'System.Web.Mvc.SelectList.SelectList(System.Collections.IEnumerable, string, string)' has some invalid arguments

Here are my codes,

View

@using (Html.BeginForm("BoxManager", "Home"))
{
    @Html.ValidationSummary(true)
    <div class="editor-label">
        <strong>Full Name</strong>
    </div>
    <div class="editor-field">
        @Html.DropDownListFor(a => a.Boxes.clientname, new SelectList(Model.Clients, "fullname", "fullname"))
        @Html.ValidationMessageFor(a => a.Boxes.clientname)
    </div>
    <p><input type="submit" class="btn btn-info" value="Add" /></p>
}

Model

public class BoxManagement
{
    public BoxInfo Boxes { get; set; }
    public IEnumerable<BoxInfo> BoxCollection { get; set; }
    public ClientInfo Clients { get; set; }
}

Controller

public ActionResult BoxManager()
{
     return View();
}

[HttpPost]
public ActionResult BoxManager(BoxManagement BoxModel)
{
     if (ModelState.IsValid)
            {
                var AddBox = BoxModel.Boxes;
                db.BoxInfoes.Add(AddBox);
                db.SaveChanges();
                return RedirectToAction("BoxPanel");
            }
            return View(BoxModel.Boxes);
}

Am I doing something wrong here? How can I save the dropdownlist selected item in my BoxInfo model? Need this help badly. Tnx.

Try something like that: @Html.DropDownListFor(a => a.Boxes.clientname, (List<SelectListItem>)Model.Clients, "fullname", null) — Marcin
– Marcin, Commented May 11, 2015 at 7:23
Check your datasource. It's likely that you have av key and value collection. In your case "Key" might be something else. @Html.DropDownListFor(a => a.Boxes.clientname, new SelectList(Model.Clients, "Key", "clientname") — Hallgeir Engen
– Hallgeir Engen, Commented May 11, 2015 at 7:32
In addition to the answers below you have other errors in your code. If ModelState is not valid then it should be return View(BoxModel); and you would need to reassign the value of BoxCollection — user3559349
– user3559349, Commented May 11, 2015 at 7:34

Dhrumil · Accepted Answer · 2015-05-11 08:02:34Z

2

The reason here is that your are passing an object of type ClientInfo instead of the required type which is IEnumerable<>. You are passing the below line into your dropdown :

new SelectList(Model.Clients, "fullname", "fullname")

The Clients is of the type ClientInfo which is not IEnumerable. You need to change it to something which represents the IEnumerabletype.

An example would be :

Model.BoxCollection

This is the IEnumerable as per your model.

UPDATE :

This should be your model code :

public class BoxManagement
{
    public BoxInfo Boxes { get; set; }
    public IEnumerable<BoxInfo> BoxCollection { get; set; }
    public IEnumerable<ClientInfo> Clients { get; set; }
}

This should be you controller code :

var ClientCollection = db.ClientsInfo.Select(..conditions..).ToList();
Model.Clients = ClientCollection;
return View(Model);

So basically, just bind the Clients object with your query into IEnumerable and pass that model to your view. That is all that is needed.

edited May 11, 2015 at 8:02

answered May 11, 2015 at 7:27

Dhrumil

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8 Comments

Shihan Khan Over a year ago

In my model, I've used public IEnumerable<ClientInfo> Clients { get; set; } instead of public ClientInfo Clients { get; set; }. Now I get this error, System.ArgumentNullException: Value cannot be null.. Any idea what is going on?

Dhrumil Over a year ago

That is because you would need to bind the data into your Clients object before sending it to the view.

Shihan Khan Over a year ago

Tnx but please explain more.

Dhrumil Over a year ago

Show the code in which you fetch the data for the IEnumerable<ClientInfo> Clients

Shihan Khan Over a year ago

@Html.DropDownListFor(a => a.Boxes.clientname, new SelectList(Model.Clients, "fullname", "fullname")) I didn't change it.

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Mathew Thompson · Accepted Answer · 2015-05-11 07:25:37Z

1

You're using the wrong field in your SelectList declaration, you're use Client, but shouldn't it be Boxes as that's the list of items. The first item in that SelectList constructor must be IEnumerable.

If you do mean boxes, then try:

@Html.DropDownListFor(a => a.Boxes.clientname, new SelectList(Model.BoxCollection, "fullname", "fullname"))

answered May 11, 2015 at 7:25

Mathew Thompson

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11 Comments

Shihan Khan Over a year ago

Nope, I'm using the Client model which I need to populate the dropdownlist. Now, In my model, I've used public IEnumerable<ClientInfo> Clients { get; set; } instead of public ClientInfo Clients { get; set; }. Now I get this error, System.ArgumentNullException: Value cannot be null.. Any idea what is going on?

Mathew Thompson Over a year ago

@SinOscuras Ah right, then it sounds like your collection is null at that point. Make sure you populate it.

Shihan Khan Over a year ago

But I've datas in my Client table. There is no null value there.

Mathew Thompson Over a year ago

@SinOscuras It sounds like it's not being returned though. Can you post the code that retrieves the client data?

Mathew Thompson Over a year ago

@SinOscuras Yes it needs to be something like that. You don't populate your model in your HttpGet method.

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