Changes to BRE in BizTalk 2006AdministratorAdministrator141402006-08-29T16:14:00Z2006-08-29T21:43:00Z1314517933Microsoft149422103611.8026Here are some of the changes to BRE in BizTalk 2006. TOC \o "1-3" \h \z \u Support for generic types and generic methodsCNDJ6nn5us4RjIIAqgBLqQsCAAAACAAAAA4AAABfAFQAbwBjADEANAA0ADYAMwA2ADcAMQAzAAAA PAGEREF _Toc144636713 \h 1Support for nullable typesCNDJ6nn5us4RjIIAqgBLqQsCAAAACAAAAA4AAABfAFQAbwBjADEANAA0ADYAMwA2ADcAMQA0AAAA PAGEREF _Toc144636714 \h 2Accessing nested members of a classCNDJ6nn5us4RjIIAqgBLqQsCAAAACAAAAA4AAABfAFQAbwBjADEANAA0ADYAMwA2ADcAMQA1AAAA PAGEREF _Toc144636715 \h 4Type Casting supportCNDJ6nn5us4RjIIAqgBLqQsCAAAACAAAAA4AAABfAFQAbwBjADEANAA0ADYAMwA2ADcAMQA2AAAA PAGEREF _Toc144636716 \h 5Invoking Static Members of a ClassCNDJ6nn5us4RjIIAqgBLqQsCAAAACAAAAA4AAABfAFQAbwBjADEANAA0ADYAMwA2ADcAMQA3AAAA PAGEREF _Toc144636717 \h 6Overriding registry key setting with application configuration fileCNDJ6nn5us4RjIIAqgBLqQsCAAAACAAAAA4AAABfAFQAbwBjADEANAA0ADYAMwA2ADcAMQA4AAAA PAGEREF _Toc144636718 \h 7GetDeploymentDriver method added to Configuration classCNDJ6nn5us4RjIIAqgBLqQsCAAAACAAAAA4AAABfAFQAbwBjADEANAA0ADYAMwA2ADcAMQA5AAAA PAGEREF _Toc144636719 \h 8Clear method added to the Policy classCNDJ6nn5us4RjIIAqgBLqQsCAAAACAAAAA4AAABfAFQAbwBjADEANAA0ADYAMwA2ADcAMgAwAAAA PAGEREF _Toc144636720 \h 9IFactRemover interface addedCNDJ6nn5us4RjIIAqgBLqQsCAAAACAAAAA4AAABfAFQAbwBjADEANAA0ADYAMwA2ADcAMgAxAAAA PAGEREF _Toc144636721 \h 10SqlTimeOut registry key addedCNDJ6nn5us4RjIIAqgBLqQsCAAAACAAAAA4AAABfAFQAbwBjADEANAA0ADYAMwA2ADcAMgAyAAAA PAGEREF _Toc144636722 \h 10 HYPERLINK \l "_Toc144636723" Arithmetic and logical operators support double promotionCNDJ6nn5us4RjIIAqgBLqQsCAAAACAAAAA4AAABfAFQAbwBjADEANAA0ADYAMwA2ADcAMgAzAAAA PAGEREF _Toc144636723 \h 10Support for generic types and generic methodsThe rule engine supports using specialized generic types and specialized generic methods in a rule. It does not support using generic types and generic methods themselves in a rule. For example, in a business rule you can use List<int>, but not List<T> (from the System.Collections.Generic namespace in the .NET class library). Currently, the Business Rule Composer tool does not support creating rules by using specialized generic types and specialized generic methods. You must create the rules programmatically by using the rule engine object model. The following sample code demonstrates how to use the List generic class in a business rule:// Create the condition list IF 1 == 1 Equal eq = new Equal(new Constant(1), new Constant(1)); // Create the action list ActionCollection ac = new ActionCollection(); //Create class binding and class member bindings ClassBinding lstClass = new ClassBinding(typeof(System.Collections.Generic.List<int>)); ArgumentCollection argc = new ArgumentCollection(); argc.Add(new Constant(3)); ClassMemberBinding add = new ClassMemberBinding("Add", lstClass, argc); // Wrapping the .NET binding as a user function UserFunction uf = new UserFunction(add); ac.Add(uf); // Create the rule Rule rl = new Rule("AddToList", eq, ac); // Create the policy RuleSet rs = new RuleSet("GenericTest"); rs.Rules.Add(rl); // Create the .NET List object List<int> lst = new List<int>(); lst.Add(1); lst.Add(2); // Print the list before executing the policy Console.WriteLine("Contents of the lists before executing the policy"); foreach (int i in lst) Console.WriteLine(i); PolicyTester pt = new PolicyTester(rs); pt.Execute(lst); // Print the list after executing the policy Console.WriteLine("Contents of the lists before executing the policy"); foreach (int i in lst) Console.WriteLine(i);Support for nullable typesThe rule engine supports using nullable types in a business rule. You can use nullable types in .NET class bindings, XML bindings, and database bindings. Currently, the Business Rule Composer tool does not support using nullable types in a business rule. You can use the nullable types when creating rules programmatically. You can create a class member binding to a property or a field whose type is a nullable type. You can also create a class member binding to a method that takes a parameter of nullable type and/or returns a value of nullable type. The following sample code demonstrates how to access a nullable field, and how to access a return value of nullable type from a method in a business rule. If you execute a console application with the following code as it is, you will see that the value of the prop field is set to 5. If you do not initialize the prop field in the class or initialize it to null and run the code, you will see that the value of the prop field is set to 1. using Microsoft.RuleEngine;namespace UseNullableAsm{ class Program { public class Class1 { public int? prop = 1; private int? prop2 = 4; public int? GetProp2() {