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Making UPC-A in Visual C#.NET Policy and Rules

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Policy and Rules
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11. Click the browse button to activate the Select Rule Set dialog box. Once the Select Rule Set dialog box is active, click its New button.
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12. Clicking the New button activates the Rule Set Editor dialog box. Click Add Rule to add a new rule and activate the dialog box controls.
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13. You are going to add the first of three rules. Each rule you add comes in three parts: Condition, Then Actions, and Else Actions (the last of which is optional). In the Condition field, type this.CheckPlasticizer(). (Note that it s a method call, so the parentheses are required.) In the Then Actions field, type this.ProcessFullOrder(). And finally, in the Else Actions field, type this.ProcessPartialOrder().
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14. Click Add Rule again, which adds a second rule to the rule set. To this rule s Condition field, type this.CheckActualPlasticizer(). In the Then Actions field, type this.ProcessFullOrder(). In the Else Actions field, type this.ProcessPartialOrder().
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15. To insert a third rule, click Add Rule again. In the third rule s Condition field, add this._shipping[this._customer] == PlasticFlow.Workflow1.Shipping.Hold && this._shipQty != this.OrderQuantity. In the Then Actions field, type this._shipPartial = False. And in the Else Actions field, add this._shipPartial = True.
16. Click OK to dismiss the Rule Set Editor dialog box. Note there is now a rule named RuleSet1 in the rule list. Click OK to dismiss the Select Rule Set dialog box.
Part II
Working with Activities
17. Your workflow is now complete. Although it might seem odd to have an entire workflow reside in a single activity, in reality you ve told your workflow what to do by the rules you provided. In any case, add a reference to the workflow from the PlasticPolicy application. Right-click the PlasticPolicy tree control node in Visual Studio s Solution Explorer, and select Add Reference. When the Add Reference dialog box appears, click the Projects tab and select PlasticFlow from the list. Click OK. 18. Open Program.cs in the PlasticPolicy project for editing, and then look for the Main method. Following the opening brace for Main, add this code:
// Parse the command line arguments string company = String.Empty; Int32 quantity = -1; try { // Try to parse the command line args... GetArgs(ref company, ref quantity, args); } // try catch { // Just exit... return; } // catch
19. Then find this line of code a bit further down in Main:
// Print banner. Console.WriteLine("Waiting for workflow completion.");
20. Add this code following the line of code you just located:
// Create the argument. Dictionary<string, object> parms = new Dictionary<string, object>(); parms.Add("Customer", company); parms.Add("OrderQuantity", quantity); // Create the workflow instance. WorkflowInstance instance = workflowRuntime.CreateWorkflow(typeof(PlasticFlow.Workflow1), parms); // Start the workflow instance. instance.Start();
12
Policy and Rules
21. In step 18, you added code that calls a method to interpret the command-line parameters. You need to add that method now. Scroll to the end of the Program.cs source file, and add this method:
static void GetArgs(ref string company, ref Int32 quantity, string[] args) { // Preset quantity... quantity = -1; try { // Parse the arguments...we must have both a company // and a quantity. for (Int32 i = 0; i < args.Length; i++) { // Check this argument...must have at least // two characters, "/c" or "/q" or even "/ ". if (args[i].Length < 2) throw new Exception(); if (args[i].ToLower()[1] == 'c') { // Company... The company name will be // located in character position 3 to // the end of the string. company = args[i].Substring(3); } // if else if (args[i].ToLower()[1] == 'q') { // Quantity... The quantity will be // located in character position 3 to // the end of the string. Note Parse // will throw an exception if the user // didn't give us an integer. quantity = Int32.Parse(args[i].Substring(3)); } // else if else { // "/ " or unrecognized. throw new Exception(); } // else } // for // Make sure we have both a company and a // quantity value. if (String.IsNullOrEmpty(company) || quantity == -1) throw new Exception(); } // try catch { // Display usage Console.WriteLine("\nPlasticPolicy.exe -"); Console.WriteLine("\tTests Windows Workflow Foundation " + "rules-based processing\n"); Console.WriteLine("PlasticPolicy.exe /c: /q:\n"); Console.WriteLine("\t- Required Arguments -\n"); Console.WriteLine("/c:<company>\n\tCompany placing order\n");
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