Bind value of action parameter with multiple name specify in list

MultipleNameBindOfParameter.cs

[System.AttributeUsage(System.AttributeTargets.Parameter, AllowMultiple = false, Inherited = true)]
public class MultipleNameBindAttribute : Attribute   
{
    public MultipleNameBindAttribute(string parameters)
    {
        if (!String.IsNullOrEmpty(parameters))
        {
            AvailableName = parameters.Split(',');
        }
    }

    public string[] AvailableName { get; private set; }
}

public class MultipleParameterNameActionFilter : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        var defaults = GetDefaults(filterContext);
        var actionParameters = filterContext.ActionParameters;
        foreach (var value in defaults)
            if (actionParameters[value.Key] == null)
                actionParameters[value.Key] = value.Value;
    }

    internal static IDictionary<string, object> GetDefaults(ActionExecutingContext filterContext)
    {
        IDictionary<string, object> defaults = null;
        if (defaults == null)
        {
            defaults = new Dictionary<string, object>(filterContext.ActionParameters.Count);
            foreach (var parameter in filterContext.ActionDescriptor.GetParameters())
            {
                if (parameter.IsDefined(typeof(MultipleNameBindAttribute), false))
                {
                    MultipleNameBindAttribute attr = parameter.GetCustomAttributes(typeof(MultipleNameBindAttribute), false)[0] as MultipleNameBindAttribute;
                    string parameterName = parameter.ParameterName;
                    object parameterValue = filterContext.ActionParameters[parameterName];
                    foreach (var name in attr.AvailableName)
                    {
                        var value = filterContext.HttpContext.Request[name];
                        if (string.IsNullOrEmpty(value)) continue;
                        parameterValue = value;
                    }
                    try
                    {
                        defaults.Add(parameterName, Convert.ChangeType(parameterValue, parameter.ParameterType));
                    }
                    catch (Exception exc)
                    {
                        throw new InvalidOperationException(String.Format(
                            CultureInfo.CurrentUICulture,
                            "The value of the DefaultAttribute could not be converted to the parameter '{0}'",
                            parameterName), exc);
                    }
                }
            }
        }
        return defaults;
    }
}