Problem with model binder property type int

asp.net-mvc-3

In my View Model I have a property:

    [Required]
    [MaxLength(4)]
    [DisplayName("CVC")]
    public int BillingCvc { get; set; }

In my view I use it like so:

@Html.TextBoxFor(x => x.BillingCvc, new { size = "4", maxlength = "4" })

When I post the form I get this error message:

Unable to cast object of type 'System.Int32' to type 'System.Array'.

However, if I change the property to string instead of int, I don't get the error. Declaring it as int allows the client validator to check if the field contains non numbers.

Best Answer

The issue is your use of MaxLength with a type of int.

see: http://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations.maxlengthattribute(v=vs.103).aspx

edit: you;re probably looking for Range(int,int)

Related Solutions

C# – Dropdownlist with IEnumerable Data type

You should be calling ToList somewhere in your EF query. Otherwise you are returning a Queryable directly to your View.

Possibly like this:

public ProductContent()
{
    productxEntities db = new productxEntities();

    ProductTypes = db.ProductCodes.ToList().Select(c => new SelectListItem
    {
        Value = c.product_type.ToString(),
        Text = c.code.ToString()
    });
}

As I mentioned in my comment though; I'd discourage this kind of code in a constructor of a Model. Someone else should be assigning it to the Model.

You should then be able to remove your cast in your View.

C# – LINQ to Entities only supports casting Entity Data Model primitive types

How about this:

ViewBag.category = 
    from c in new IntraEntities().CategoryItems.ToList()
    select new SelectListItem 
    {
        Text = c.Name, 
        Value = c.ID.ToString() 
    };

and how about using strongly typed view models instead of some weakly typed crap of a ViewBag (it's the way I call it)?

Like this:

public class CategoryViewModel
{
    public string CategoryId { get; set; }
    public IEnumerable<SelectListItem> Categories { get; set; }
}

then:

public ActionResult Foo()
{
    var model = new CategoryViewModel
    {
        Categories = 
            from c in new IntraEntities().CategoryItems.ToList()
            select new SelectListItem 
            {
                Text = c.Name, 
                Value = c.ID.ToString() 
            }
    };
    return View(model);
}

and finally in your strongly typed view:

@model CategoryViewModel
@using (Html.BeginForm())
{
    @Html.DropDownListFor(x => x.CategoryId, Model.Categories)
    <button type="submit">OK</button>
}

Much better, don't you think?

Best Answer

Related Solutions

C# – Dropdownlist with IEnumerable Data type

C# – LINQ to Entities only supports casting Entity Data Model primitive types

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