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Checking Rules for One Property
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The first checks the rules for a specific property: Public Sub CheckRules(ByVal propertyInfo As Csla.Core.IPropertyInfo) CheckRules(propertyInfo.Name) End Sub Public Function CheckRules(ByVal propertyName As String) As String() If _suppressRuleChecking Then Return New String() {} End If Dim result = New List(Of String)() result.Add(propertyName) ' get the rules dictionary Dim rules = RulesToCheck If rules IsNot Nothing Then ' get the rules list for this property Dim rulesList = rules.GetRulesForProperty(propertyName, False) If rulesList IsNot Nothing Then ' get the actual list of rules (sorted by priority) Dim list = rulesList.GetList(True) If list IsNot Nothing Then CheckRules(list) End If Dim dependencies = rulesList.GetDependencyList(False) If dependencies IsNot Nothing Then For i As Integer = 0 To dependencies.Count - 1 Dim dependentProperty = dependencies(i) result.Add(dependentProperty) CheckRules(rules, dependentProperty) Next End If End If End If Return result.ToArray() End Function There s a lot going on here, so I ll break it down.
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CHAPTER 11 BUS INE SS AND V ALIDA TION RULES
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There are two overloads: one takes an IPropertyInfo, and the other is a simple string. When a business object calls this method directly, the business developer will typically provide an IPropertyInfo, but internally all the work is done based on the property name as a String value.
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Note
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The overload that accepts a string parameter is Public just so it s backward compatible with older versions of CSLA.NET.
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The first thing the method does is check to see whether rule checking is suppressed: If _suppressRuleChecking Then Return New String() {} End If A business object can set ValidationRules.SuppressRuleChecking to True to prevent CheckRules() from doing any work. This is often useful when a lot of interdependent properties must be loaded all at once (such as behind a web page or XML service). In that case, an explicit call to CheckRules() is typically made after all property values have been loaded so the rules can be executed in a more efficient manner. The methods return a String array. That array contains a list of the property names for which rules were checked. If a rule has dependent properties, then this call may check the rules for more than one property. The code in BusinessBase uses this String array to determine what PropertyChanged events should be raised, as I discussed in 10. Of course, it is clear that at least the requested property s rules will be checked: Dim result = New List(Of String)() result.Add(propertyName) This method gets the list of rules for this property by calling the RulesToCheck property: Dim rules = RulesToCheck If rules IsNot Nothing Then The RulesToCheck property is interesting, because it provides a consolidated list of the rules for this property. The list is a combination of the per-instance and per-type rules. Usually only per-type rules exist, but if there are per-instance rules, they are merged into the list as well, and the list is sorted by priority. Look at the property in the ValidationRules class to see how this is done. Obviously, CheckRules() continues to do work only if the rules field is not Nothing; if it is Nothing, then no rules are associated with this property, and the method can just exit. Assuming there are rules for this property, the list of rules is retrieved from the ValidationRulesManager, and the GetList() method is used to get the sorted list of IRuleMethod objects: Dim rulesList = rules.GetRulesForProperty(propertyName, False) If rulesList IsNot Nothing Then ' get the actual list of rules (sorted by priority) Dim list = rulesList.GetList(True) If list IsNot Nothing Then CheckRules(list) End If The sorted list is passed to another overload of CheckRules(). That overload is responsible for looping through the list and invoking each rule. It is also responsible for adding and removing items from the list of broken rules, which I ll discuss later in this chapter. Finally, if there are any dependent properties associated with the current property, their rules are checked too:
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