Business rules execution order.

[lmsantin]

I have modified the priority of some business rules in my class and I thought they will execute from priority 0 to higher.

What I got when I tested was all the rules executing in the order they are defined inside the protected override void AddBusinessRules() method.

Is that ok?

[jonnybee]

BusinessRules are always executed on a per-property basis.

So the execution order is "property", "priority ascending".(Edited - changed to priority - was sortorder)

And it is perfectly legal to have priority less than 0 (to be executed before the default value of 0).

[lmsantin]

@jonnybee just to know if I got you. "sortorder" means priority

[jonnybee]

Yes, it does.

[lmsantin]

@jonnybee We are using CSLA 4.5.700.0

We are suppresssing the rule execution using the ICheckRules Technique.

What must expect about the rule priorities when we invoke the CheckRules method?

[jonnybee]

You will get a BusinessRules.CheckRules to check all rules in the object.:

 void ICheckRules.CheckRules()
{
  BusinessRules.CheckRules();
}

And check rules in turn does a CheckObjectRules and then a foreach property a CheckRules(property)

public List<string> CheckRules()
{
  if (_suppressRuleChecking)
    return new List<string>();

  RunningRules = true;
  var affectedProperties = CheckObjectRules(RuleContextModes.CheckRules, false);
  var properties = TypeRules.Rules.Where(p => p.PrimaryProperty != null)
                                      .Select(p => p.PrimaryProperty)
                                      .Distinct();
  foreach (var property in properties)
    affectedProperties.AddRange(CheckRules(property, RuleContextModes.CheckRules));
  RunningRules = false;
  if (!RunningRules && !RunningAsyncRules)
    _target.AllRulesComplete();
  return affectedProperties.Distinct().ToList();
}

CheckObjectRules will execute rules where PrimaryProperty == null ordered by RulePriority ASC ChgeckRules is called per-property and will execute rules ordered by RulePriority ASC (in the first pass) and the rerun rules for affected properties.

See: https://jonnybekkum.wordpress.com/2012/04/29/unit-test-csla-4-businessrules/ and https://jonnybekkum.wordpress.com/2011/08/29/csla-4-2-rules-update/ and https://jonnybekkum.wordpress.com/2012/11/07/csla-4-5-ruleengine-update/

[lmsantin]

Thank a lot @jonnybee