DesignTimePropertyAttributes GetDesignTimePropertyAttributes(PropertyInfo propertyInfo)
{
DesignTimePropertyAttributes result = new DesignTimePropertyAttributes();
PrecisionAttribute numDigitsAttribute = propertyInfo.GetCustomAttribute <PrecisionAttribute>();
if (numDigitsAttribute != null)
{
result.NumDigits = numDigitsAttribute.NumDecimalPlaces;
}
DisplayTextAttribute displayTextAttribute = propertyInfo.GetCustomAttribute <DisplayTextAttribute>();
if (displayTextAttribute != null)
{
result.DisplayText = displayTextAttribute.DisplayText;
}
DependentPropertyAttribute dependentPropertyAttribute = propertyInfo.GetCustomAttribute <DependentPropertyAttribute>();
if (dependentPropertyAttribute != null)
{
result.DependentProperty = dependentPropertyAttribute.DependentProperty;
}
return(result);
}
private static void ValidateDependentProperty(DependentPropertyAttribute attrib, PropertyInfo property, NewObjectParameters parameters)
{
var target = parameters.GetType().GetProperty(attrib.Property.ToString()).GetValue(parameters);
if (target.ToString() == attrib.RequiredValue.ToString())
{
ValidateRequiredValue(property, parameters, attrib);
}
}
private static void ValidateRequiredValue(PropertyInfo property, NewObjectParameters parameters, DependentPropertyAttribute attrib = null)
{
var val = property.GetValue(parameters);
var dependentStr = attrib != null ? $" when property '{attrib.Property}' is value '{attrib.RequiredValue}'" : "";
if (string.IsNullOrEmpty(val?.ToString()))
{
throw new InvalidOperationException($"Property '{property.Name}' requires a value{dependentStr}, however the value was null or empty.");
}
var list = val as IEnumerable;
if (list != null && !(val is string))
{
var casted = list.Cast <object>();
if (!casted.Any())
{
throw new InvalidOperationException($"Property '{property.Name}' requires a value, however an empty list was specified.");
}
}
}
