asp.net MVC 1.0 and 2.0 currency model binding
- by David Liddle
I would like to create model binding functionality so a user can enter ',' '.' etc for currency values which bind to a double value of my ViewModel.
I was able to do this in MVC 1.0 by creating a custom model binder, however since upgrading to MVC 2.0 this functionality no longer works.
Does anyone have any ideas or better solutions for performing this functionality? A better solution would be to use some data annotation or custom attribute.
public class MyViewModel
{
public double MyCurrencyValue { get; set; }
}
A preferred solution would be something like this...
public class MyViewModel
{
[CurrencyAttribute]
public double MyCurrencyValue { get; set; }
}
Below is my solution for model binding in MVC 1.0.
public class MyCustomModelBinder : DefaultModelBinder
{
public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
{
object result = null;
ValueProviderResult valueResult;
bindingContext.ValueProvider.TryGetValue(bindingContext.ModelName, out valueResult);
bindingContext.ModelState.SetModelValue(bindingContext.ModelName, valueResult);
if (bindingContext.ModelType == typeof(double))
{
string modelName = bindingContext.ModelName;
string attemptedValue = bindingContext.ValueProvider[modelName].AttemptedValue;
string wantedSeperator = NumberFormatInfo.CurrentInfo.NumberDecimalSeparator;
string alternateSeperator = (wantedSeperator == "," ? "." : ",");
try
{
result = double.Parse(attemptedValue, NumberStyles.Any);
}
catch (FormatException e)
{
bindingContext.ModelState.AddModelError(modelName, e);
}
}
else
{
result = base.BindModel(controllerContext, bindingContext);
}
return result;
}
}
