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If there are many keys that you will be accessing, then utilize the dictionary objects TryGetValue method, which is faster and will make it so that no exceptions are thrown. The following code shows this method in use: object objEmpID = null; string empid = null; if (!e.Outputs.TryGetValue("EmpID", out objEmpID)) { Console.WriteLine("The EmpID value was not found in the output collection"); } else { empid = objEmpID as string; if (empid == null) Console.WriteLine("The value in EmpID could not be converted to a string"); else Console.WriteLine("The value of EmpID passed back from the workflow was {0}", objEmpID); }

Figure 6-6. BalanceAdjustmentWorkflow with CallExternalMethodActivity If you started with the version of the BalanceAdjustmentWorkflow that you developed in the previous example, there are no additional coding changes. The BalanceAdjustmentWorkflow.cs file should look like Listing 6-10 without any additional changes.

CIM classes are provided and implemented by special providers that have been registered with the system. In the case of WMI, providers are COM DLLs that have been registered with the system registry. This architecture allows for easy extensibility. A program or service can

To test the revised version of the workflow, simply execute the ConsoleLocalServices application that you used for the previous examples. No changes to the application code are necessary. When I execute this on my machine, I see the same consistent results:

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expose a management interface by creating a provider. That provider will register additional classes in a different namespace, but other than that, administrators will be able to manage that piece of software just as they would manage any other WMI component. The CIM standard defines a set of standard classes, such as CIM_Process, that must be present on any system. It is good knowing about those and using them where possible, but that may not be sufficient for our needs at all times. The standard cannot possibly describe everything about an object and yet be as generic as possible. For example, a Windows process is a bit different than a process running on a UNIX system. There are management operations for a Windows process that would make no sense in a UNIX context. The WMI designers at Microsoft have solved this problem by extending the base CIM classes and using them wherever possible. To continue with the process example, WMI offers a Win32_Process class that inherits from and, therefore, extends the CIM_Process one. A Win32_Process object is still a valid CIM_Process object and supports all operations a CIM_Process would support. The inheriting class adds to the base properties; Win32_Process adds several Windows-specific properties, such as ExecutablePath and ThreadCount.

Executing BalanceAdjustmentWorkflow Revised Account: 101, Name=Neil Armstrong, Bal=$75.00 Completed BalanceAdjustmentWorkflow Press any key to exit Using the CallExternalMethodActivity is the simplest way to call a local service method. It allows you to easily bind the method parameters to workflow properties or those of another activity. And it accomplishes this with zero code. Use CallExternalMethodActivity when the method call is isolated and not part of a larger sequence of calls. A custom activity might make more sense if you have a series of related methods to call on the same service and wish to encapsulate them all into a single activity.

In 6, you read about the new features of WCF in .NET 4.0. One of the things we covered was how to utilize these features to create WCF endpoints. In the section that follows, you will build on those lessons from 6 and review the new features in WF 4.0 that enable you to integrate with WCF.

Summary

Object and information models are only a piece of the entire management puzzle We need to be able to talk to objects anywhere on the network, and to be able to do that, we need a standard protocol One of the first attempts to specify a standard was DMTF s CIM-XML protocol, which specifies object operations in XML and uses HTTP to transport the XML messages For one reason or another, Microsoft did not choose to implement CIM-XML for WMI WMI uses the Distributed COM (DCOM) infrastructure to connect to objects running on the network That approach has the benefit of integrating with an existing infrastructure on Windows systems Unfortunately, it also makes WMI incompatible with other WBEM implementations at the network-protocol level.

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