ASP.NET MVC 3 binding user control of type KeyValuePair to ViewModel

Question

I have created a special User Control which inherits KeyValuePair. Inside my ViewModel, there is a property called lookup

[UIHint(\"Lookup\")]
public KeyValuePai         


        

Answer 1

The KeyValuePair structure doesn't have a default parameterless constructor and can't be instantiated by the model binder. I recommend a custom model class for your view that has just those properties.

public class CustomControlViewModel
{
    public string Key { get; set; }
    public string Value { get; set; }
}

Transform your KVP into this model class for your view and/or use this class as the parameter on your action.

[HttpGet]
public ActionResult Lookup()
{
    return View( new CustomControlViewModel { Value = kvp.Value, Key = kvp.Key } );
}

[HttpPost]
public ActionResult Lookup( CustomControlViewModel lookup )
{
     ...
}