ArgumentNullException in CommonRules.RegExMatch()

My goal with RegEx is to allow anything that can be evaluated to be evaluated.

Your regex might reject or accept an empty string – I can’t make that judgment in code without restricting what can be expressed in the regex itself.

So the only real debate here, and I agree that there is one, is what to do about null values?

There are three answers:

1.       A null is an automatic True result

2.       A null is an automatic False result

3.       A null is converted to string.Empty and the regex runs

I’m not entirely sure which is the right answer overall, but thinking about it right now I lean toward #3.

Rocky

A “required integer” field probably just means the value must be >0 right? So you can use the MinValue rule, or the RegExMatch rule.

To deal with null values that should flow from the UI to/from the database, you should look at Nullable(Of T). In C# the compiler implements some syntactic sugar around Nullable<T> to give you things like int? and bool? which are nullable values.

Rocky

Rocky,

i am having an bo say employee. which do have up an required field i.e companyid (to which company he belongs) now i wnat to implement this in my bo .
that is in validation rules there is something called stringrequired , but this is going to be an int filed so doesnt there do exist something like intrequired .

another thing . coming up to the same scenario ,assuming the same business object employee , the companyid (which is to be populated via another namevalue list object) is the foreign key in database , but the datamapper maps it and returns 0 if null so to overcome this , what would be the best approach as if to handle null values and pss the null values back to database . like this should go null rather then 0 to database and come 0 rather then null from database as all the namevalue lsit objects do contain a default item with index 0 so i dont thing that could b a prob .

thanks
govind

I don’t know.

One possible issue: you aren’t using the NoInlining attribute in your property declaration, but you are using the CanReadProperty(), CanWriteProperty() and PropertyHasChanged() overloads that only reliable work if you DO use the NoInlining property.

Rocky

Rocky,

I am using csla 3.0
I am working on to integrate validatino application blocks(VAB), DAAB, and caching application blocks with csla .

firstly moving with VAB here are the steps i had followed.
1. got the refrence of VAB,Common , from application blocks
2. created a class VAB with the following definition
 public class VABRules
    {
        public class VABRuleArgs : RuleArgs
        {
            private string _ruleset;

            public string Ruleset
            {
                get { return _ruleset; }
            }


&nbs p;           public VABRuleArgs(string propertyName)
                : this(propertyName, null)
            {
            }

            public VABRuleArgs(string propertyName, string ruleset)
                : base(propertyName)
            {
                _ruleset = ruleset;
            }
        }

        public static bool V ABValid<T>(object target, RuleArgs e)
        {
            Validator<T> validator = ValidationFactory.CreateValidator<T>(((VABRuleArgs)e).Ruleset);

            if (validator == null)
                return true;

            ValidationResults results = validator.Validate(target);

            if (results == null)
                return true;

            foreach (ValidationResult result in results)
            {
                if (result.Key == e.PropertyName)
                {
                    e.Description = result.Message;
                    return false;
                }
            }

            return true;
        }
    }

now on csla object say currency

for one of my property .
  [NotNullValidator]
        [StringLe ngthValidator(1, 50, MessageTemplate = "Currency code can not be empty")]
   
        public string sCode
        {
            get
            {
                CanReadProperty(true);
                return _Code;
            }
            set
            {
                CanWriteProperty(true);
           &n bsp;    if (value == null) value = string.Empty;
                if (_Code != value)
                {
                    _Code = value;
                    PropertyHasChanged();
                }
            }
        }

and finally in the

  protected override void AddBusinessRules()
        {
                ValidationRules.AddRule(VABRules.VABValid<Currency>, new VABRules.VABRuleArgs("sCode","RuleSetCurrency"));

        }


but this is not getting called and not firing validation . on contrary done with csla.validation it is working fine .

coould you please shed some light on the issue why i am not able to get the validation check .

thanks
govind

If you don’t like the messages returned from the rule methods in CommonRules then you can create your own rule methods – create your own common rules library within your application. This is the whole reason the architecture is so open and delegate-based, is to allow you to create your own rule methods to meet your needs.

I don’t understand what you are saying about the grid, sorry.

Rocky

hmm ,

seems as if i had to use the csla contrib library instead of validation application block .
but the only mess i m facing with is that i am nto able to throw custom messages if using the commonrules.
thats why i opted for validation blocks .

is there any workaround to get the custom message s.

1 most importatnt thing is that while being up in insert mode , say for example i do get up the validation rule exception the whole of the dataview is cleared mean the object is recreated fresh which i want to avoid mean i want that if error is there then the object does not get clear but instead stops processing if something is wrong there if with the data being retained (which is correct)

how to achieve this .

thanks
govind