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After creating an instance of the WorkflowRuntime and WorkflowRuntimeManager classes, the AddServices method is invoked to add the local service. This method first creates an instance of the ExternalDataExchangeService and adds it to the WorkflowRuntime instance. The AccountService is then created and added to the ExternalDataExchangeService. That s really all there is to adding a local service to the workflow runtime. The remainder of the code creates a Dictionary containing the Id and Adjustment parameters, starts an instance of the BalanceAdjustmentWorkflow, and then writes the results to the Console. The final bit of required code goes into the Program.cs file to execute the static Run method of the LocalServiceTest class. The Program.cs code looks like this: using System; namespace ConsoleLocalServices { public class Program { static void Main(string[] args) { LocalServiceTest.Run(); Console.WriteLine("Press any key to exit"); Console.ReadKey(); } } } When executed on my machine, the results look like this: Executing BalanceAdjustmentWorkflow Revised Account: 101, Name=Neil Armstrong, Bal=$75.00 Completed BalanceAdjustmentWorkflow Press any key to exit Since I am formatting the balance as currency, your results may look different if your computer uses a different regional setting. This account started with a balance of 100.00 and the test applied an adjustment of 25.00. Therefore, the result of 75.00 is correct and the workflow succeeded. Use this approach when you need to reference a service directly from code in the workflow class. This would be the case if you use activities such as CodeActivity that add event handlers to the workflow class.

Name ---C:

In 4, you saw that core workflow services could be loaded and configured using an application configuration file (App.config). You can also load local services in a similar manner. Declaring them in an application configuration file enables you to externally configure your workflow application. If you need to change the set of local services that are loaded, you can accomplish that without rebuilding the application. To load local services in this manner, you need to add the appropriate entries to the application configuration file and then use a different constructor for the ExternalDataExchangeService class in the workflow runtime startup code. Listing 6-7 shows an App.config file that loads the same local service used in the previous example.

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The next step is to add an activity to your new workflow. Open the toolbox and drag a Sequence activity onto the designer. Then, expand the Primitives section to find the WriteLine activity. Drag the WriteLine activity onto the Sequence shape in the designer. With the WriteLine activity selected, open the property sheet (see Figure 7-5).

Listing 6-7. App.config That Loads Local Services < xml version="1.0" encoding="utf-8" > <configuration> <configSections> <section name="WorkflowRuntime" type="System.Workflow.Runtime.Configuration.WorkflowRuntimeSection, System.Workflow.Runtime, Version=3.0.00000.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" /> <section name="LocalServices" type="System.Workflow.Activities.ExternalDataExchangeServiceSection, System.Workflow.Activities, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/> </configSections> <WorkflowRuntime Name="ConsoleLocalServices" > <CommonParameters> <!--Add parameters common to all services--> </CommonParameters> <Services> <!--Add core services here--> </Services> </WorkflowRuntime> <LocalServices> <Services> <!--Add local services here--> <add type="SharedWorkflows.AccountService, SharedWorkflows,Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" /> </Services> </LocalServices> </configuration>

Definition ---------Set-Location C:

4 discusses the WorkflowRuntime section of this configuration file in more detail. Refer to that chapter for additional information.

As you can see, the help command is a function, the C: command that you use to go to the C: drive is a function too it calls the Set-Location cmdlet to go to the C: drive. The ps command is an alias for Get-Process, and there is an external application help.exe in C:\Windows\System32 that we can run if needed. The Definition property is really useful for external commands. I do not remember how many times I have wondered where the executable file for a given command resides. No more of that! Here is how to get the path to several well known Windows utilities: PS> (Get-Command ping).Definition C:\Windows\system32\PING.EXE PS> (Get-Command tracert).Definition C:\Windows\system32\TRACERT.EXE PS> (Get-Command calc).Definition C:\Windows\system32\calc.exe PS> (Get-Command winword).Definition

First, an entry has been added to the configSections that identifies the LocalServices section. This associates the LocalServices section with the ExternalDataExchangeServiceSection class that processes it. Next, the individual local services that you wish to load are added to the LocalServices section. To actually use these entries, you need to modify the code that initializes the workflow runtime engine so that it uses these configuration file sections. Listing 6-8 shows the revisions needed to the LocalServiceTest.cs file used in the previous example (in the ConsoleLocalServices project). Listing 6-8. LocalServiceTest.cs Using App.config Entries using using using using System; System.Collections.Generic; System.Workflow.Runtime; System.Workflow.Activities;

Figure 7-5. Sequence Workflow You will start with a basic workflow that will illustrate the general steps needed to build a workflow. You can always go back later and add activities. One of things that you might have noticed is that there is a new collection of base activities. All of the activities are completely new and have been rewritten in WF 4.0. You ll deal with three properties: DisplayName, Text, and TextWriter. The DisplayName property can be used only on the design surface, while the TextWriter property allows you to provide a TextStream object to write the text to. If this is not specified, then the output will go to the console. The Text property is the text that you want to output. This property is an expression editor, and you can place any expression you want into the textbox.

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