CODEWITHSUNDEEP
c#asp.net-mvc
user1289397
user1289397

Reputation: 363

Data Binding Exception With @Html.DropDownListFor

I am having trouble binding values to a Drop Down List.

Model

public class DummyModel
{
    ...
    public int? OptionID { get; set; }
    ...
}

Line In View Causing Exception

@Html.DropDownListFor(model => model.OptionID, new SelectList(ViewBag.AvailableOptions, "ID", "Name"))

The Contents of the ViewBag

?ViewBag.AvailableOptions
Count = 4
    [0]: {[3, Average Speed]}
    [1]: {[4, Snails pace]}
    [2]: {[1, Super Fast]}
    [3]: {[2, Super Slow]}

The exception that gets generated:

System.Web.HttpException: 'DataBinding: 'System.Collections.Generic.KeyValuePair`2[[System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.String, mscorlib, Version=4.0.0.0, Culture=neutral,

Upvotes: 0

Views: 560

Answers (1)

Noémie Lord
Noémie Lord

Reputation: 781

If (as mentioned in the comments / from the text of the exception), ViewBag.AvailableOptions is a dictionary you'll want to change the Id and Value properties of your select list like so : 

new SelectList(ViewBag.AvailableOptions, "Key", "Value")

Since a dictionary is basically a list of KeyValuePair objects when enumerated, its properties are (as one could imagine) Key and Value.

Upvotes: 1

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