public object Convert(object value, Type targetType, object parameter, string language)
{
double parameterVal;
if(value != null && parameter != null &&
double.TryParse(parameter as string, out parameterVal))
{
var percentage = (double)System.Convert.ChangeType(value, typeof(double)) / parameterVal * 100;
return string.Format($"{percentage:0.0}%");
}
return value;
}