These methods exist in a helper class, and the ruleSet variable is a private field of the RuleSet type. The code show here uses the SqlCe database provider, just to prove it can be done. You can, of course, use any database mechanism you like. Close ; sqlConn. This is where the ruleset we retrieved from the database is converted from XML back to a ruleset object.
Deserialize reader as RuleSet ; Cool! So now we've got the rules loaded up from the database. At this point we'd love to be able to just point the rules at an object of our choice and run them, but before we do, we have to check that the rules are still valid. Because when we deserialised the rules from the database we had no guarantee that those rules were still valid for the object we are going to run them against.
Method signatures may have changed, properties may have been removed or we may have loaded up rules created for a completely different class. By validating the rules we protect ourselves from most run time errors. To do it we use the RuleValidation class. Firstly we are validating the rules by passing in the type of the object we are going to run them against and checking if there are any errors.
Then secondly we are creating an instance of the RuleExecution class. This is needed to store the state information used by the rule engine when validating rules. Note that while we are passing in the validated rules and the object we want to execute the rules on at this point we have not yet executed the rules, we have just created the context in which they will run.
So now we come to it. ExecuteRuleSet this ; Now all we need to run rules in our classes is these few lines of code. Pretty cool, hey? If you've got any comments I'd love to hear them Richard Banks Do you want help with agility, architecure, devops, or team practices? Get in touch via LinkedIn or Twitter and talk to Richard today.
In the second topic, these activities are assembled along with built-in workflow activities into a flowchart workflow. In the third topic, the host application is configured to run the workflow, and in the final topic persistence is introduced. Each step in this process depends on the previous steps, so we recommend that you complete them in order.
How to: Create a Workflow Describes how to create flowchart, sequential, and state machine workflows by using built-in activities and the custom activities from the preceding tutorial.
How to: Run a Workflow Describes how to invoke a workflow from a host environment, pass data into and out of a workflow, and how to resume bookmarks. How to: Create a Custom Tracking Participant Describes how to create a custom tracking participant and tracking profile.
How to: Update the Definition of a Running Workflow Instance Describes how to use dynamic update to modify running workflow instances. I am either not using these technologies correctly by which I mean I am not aware of a property of rulesets to be evaluated hierharhically in exclusive branches, or faster switching activities or there is no easy way to control the flow of execution with just a ruleset and I must therefore incur a large performance penalty with the activities.
In which case I might as well write my own rule engine. Edit 2: A diagram of the flow of execution I need from the ruleset. This is achieved by using one additional external variable which serves as the rule id to be next executed, and doubling the number of rules these extra "execution flow control" rules are hidden from the user.
This doubles my execution time, but is still acceptable when compared to using the IfElse Activity. Around rows of data can be processed in under a minute. Equivalent diagram to the one in the question :. How are we doing? Please help us improve Stack Overflow. Take our short survey. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow.
Learn more. Can the Windows Workflow Rules Engine handle branching? Ask Question. Asked 8 years, 6 months ago. Active 8 years, 6 months ago. Viewed 1k times.
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