Business rules dependent on property calculated by another BR do not evaluate.

[bujma]

Hello.

We are using CSLA in our project. We have a few business objects that work, but in each we have problems when it comes to dependency of calculated properties: calculations that depend on another calculated property do not fire.

Let's say we have this simple example:

• A * (B + C) = R1
• there is another calculation returning string result R2 according to R1 value
• for a reason, result of (B + C) is important information itself, not just internal part of final R1 calculation. Therefor its calculation is a separate rule.

Findings:

• (B + C) calculation is fired after any change of B or C
• neither R1 nor R2 calculations get started after change of B or C
• calculation R1 starts only after change of A.

Where is the problem?

Details are in attached solution (DependentRulesProblem.zip).
In the code: A = InputValue1, B = InputValue2Part1, C = InputValue2Part2, (B + C) = CalculatedValue2, R1 = Result1Number, R2 = Result2String.

Thanks much.

[hurcane]

The default behavior of business rules is to not cascade property changes. This is a safeguard to avoid unexpected infinite loops.

To enable the desired behavior, add this line to the class constructor:
BusinessRules.CascadeOnDirtyProperties = true;

[bujma]

That was super fast and even works 😉. How could I overlook that property... thank you very much.

[ossendorf-at-hoelscher]

I think the constructor is too early. Because the BusinessRules depend on the ApplicationContext which is not set in the constructor.
I'm setting this property in the OnApplicationContextSet method which you can override.

[bujma]

Just a note for my case: I did not mention that for current moment we have to use old version 5.5.2, where OnApplicationContextSet is not present and we live in "old" CSLA environment.
Thanks for your note, I will use this info in the future when we migrate to the latest version. 🤝