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The final bit of code in SmartDate exists to help simplify data access. This is done by implementing a method that allows a SmartDate value to be converted to a format suitable for writing to the database. Though SmartDate already has methods to convert a date to text and text to a date, it doesn t have any good way of getting a date formatted properly to write to a database. Specifically, it needs a way to either write a valid date or write a null value if the date is empty. In ADO.NET, a null value is usually expressed as DBNull.Value, so it is possible to implement a method that returns either a valid DateTime object or DBNull.Value: public object DBValue { get { if (this.IsEmpty) return DBNull.Value; else return this.Date; } } Since SmartDate already implements an IsEmpty() property, the code here is pretty straightforward. If the value is empty, DBNull.Value is returned, which can be used to put a null value into a database via ADO.NET. Otherwise, a valid date value is returned. At this point, you ve seen the implementation of the core SmartDate functionality. While using SmartDate is certainly optional, it does offer business developers an easy way to handle dates that must be represented as text, and to support the concept of an empty date. Later in the chapter, the SafeDataReader will also include some data access functionality to make it easy to save and restore a SmartDate from a database. This same approach can be used to make other data types smart if you so desire. Even with the Nullable<T> support from the .NET Framework, dealing with empty values often requires extra coding, which is often most efficiently placed in a framework class like SmartDate.
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CHAPTER 5 s COMPLETING THE FRAMEWORK
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The BusinessBase class implemented in 3 includes support for validation rules. Each rule is a method with a signature that conforms to the RuleHandler delegate. A business object can implement business rules conforming to this delegate, and then associate those rule methods with the properties of the business object. Most applications use a relatively small, common set of validation rules such as that a string value is required or has a max length, or that a numeric value has a minimum or maximum value. Using reflection, it is possible to create highly reusable rule methods which is the purpose behind the Csla.Validation.CommonRules class. Obviously, using reflection incurs some performance cost, so these reusable rule methods may or may not be appropriate for every application. However, the code reuse offered by these methods is very powerful, and most applications won t be adversely affected by this use of reflection. In the end, whether you decide to use these rule methods or not is up to you.
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s Tip
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If reflection-based rules are problematic for your application, you can implement hard-coded rule methods on a per-object basis.
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If you find the idea of these reusable rules appealing and useful, you may opt to create your own library of reusable rules as part of your application. In that case, you ll want to add a class to your project similar to CommonRules, and you can use the rule methods from CommonRules as a guide for building your own reusable rule methods.
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The RuleHandler delegate specifies that every rule method accepts two parameters: a reference to the object containing the data, and a RuleArgs object that is used to pass extra information into and out of the rule method. The base RuleArgs object has a PropertyName property that provides the rule method with the name of the property to be validated. It also includes a Description property that the rule method should set for a broken rule to describe why the rule was broken.
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