Phil Haacks DecimalModelBinder adapted to handle nullable decimals

DecimalModelBinder.cs

using System;
using System.Globalization;
using System.Web.Mvc;

namespace My.ModelBinders
{
    /// <summary>
    /// Thank you Phil Haack: used to model bind multiple culture decimals
    /// http://haacked.com/archive/2011/03/19/fixing-binding-to-decimals.aspx
    /// 
    /// Use by adding these 2 lines to Application_Start in Global.asax.cs:
    /// 
    /// System.Web.Mvc.ModelBinders.Binders.Add(typeof(decimal), new ModelBinders.DecimalModelBinder());
    /// System.Web.Mvc.ModelBinders.Binders.Add(typeof(decimal?), new ModelBinders.DecimalModelBinder());
    /// </summary>
    public class DecimalModelBinder : IModelBinder
    {
        public object BindModel(ControllerContext controllerContext,
            ModelBindingContext bindingContext)
        {
            ValueProviderResult valueResult = bindingContext.ValueProvider
                .GetValue(bindingContext.ModelName);
            ModelState modelState = new ModelState { Value = valueResult };
            object actualValue = null;
            try
            {
                //Check if this is a nullable decimal and a null or empty string has been passed
                var isNullableAndNull = (bindingContext.ModelMetadata.IsNullableValueType &&
                                         string.IsNullOrEmpty(valueResult.AttemptedValue));

                //If not nullable and null then we should try and parse the decimal
                if (!isNullableAndNull)
                {
                    actualValue = decimal.Parse(valueResult.AttemptedValue, NumberStyles.Any, CultureInfo.CurrentCulture);
                }
            }
            catch (FormatException e)
            {
                modelState.Errors.Add(e);
            }

            bindingContext.ModelState.Add(bindingContext.ModelName, modelState);
            return actualValue;
        }
    }
}