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PowerShell and .NET are really cool technologies, but it will take time until they take over the entire world. There is a lot of useful code out there written in VBScript, JScript, or other Windows Script Host compatible languages. It would be very unwise, and maybe downright impossible, to throw all that code away and start rewriting everything in PowerShell. Besides existing code, the Web is full of examples automating various programs all written in VBScript or JScript. Sometimes, the examples are not short, and we cannot convert them to PowerShell on the fly. We need a usable way for our PowerShell code to interoperate with code written in JScript and VBScript. Luckily, we have a good tool that can help us here the MSScriptControl COM object available through the MSScriptControl.ScriptControl ProgID. It has been designed so that it can host a script environment; we can register code with it and later execute that code. We can use this object as a way to load an existing VBScript or JScript file from PowerShell. Once loaded, we can call functions inside those files, pass parameters, and get return values. To demonstrate how the script control object works, we will work with two script files that know how to calculate the size of a file in bytes. One of them, FileSize.js, is written in JScript, and the other, FileSize.vbs, in VBScript. Both files define a function, GetFileSize(), that accepts a path to a file and returns a nicely formatted string containing the path to the file and the file size. Here is the JScript implementation: function GetFileSize(filePath) { var fileSystem = new ActiveXObject("Scripting.FileSystemObject"); var file = fileSystem.GetFile(filePath); return (filePath + " has " + file.Size + " bytes."); } And here is the VBScript one:

To begin, create a new project using the Empty Workflow Project template and name the project SharedWorkflows. This creates a DLL assembly that can be referenced by other projects. Now add a new C# class to the SharedWorkflows project and name it Account. This is a normal C# class, not a workflow class. The purpose of this class is to define a test object that can be modified by the local service. You will see how this class is used as test data by the service implementation in Listing 6-3. Listing 6-1 shows the complete code for the Account.cs file.

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It s time to create your first workflow. Start Visual Studio 2010 and create a new project. Select the workflow node, and you will be presented with four new project types (see Figure 7-3). We are going to select the Workflow Console Application and give it the name, 7Workflow. The figure also illustrates how you can create custom activities.

Listing 6-1. Complete Account.cs File using System; namespace SharedWorkflows { /// <summary> /// Defines an account /// </summary> [Serializable] public class Account { public Int32 Id { get; set; } public String Name { get; set; } public Double Balance { get; set; } } }

Function GetFileSize(filePath) Dim fileSystem Set fileSystem = CreateObject("Scripting.FileSystemObject") Dim file Set file = fileSystem.GetFile(filePath) GetFileSize = filePath & " has " & file.Size & " bytes." End Function As you can see, each language has its quirks in declaring functions and variables and working with COM objects. To be able to invoke the JScript function in PowerShell, we need to read the FileSize.js file contents and pass them to the script control AddCode() method. That method will evaluate the function definition and make it available for later use.

Next, you need to declare a contract that the service class will implement. This takes the form of a normal C# interface that defines all the methods and events that you wish to make available to workflows. Add a new interface to the SharedWorkflows project and name it IAccountServices. Listing 6-2 shows the complete code you need for the IAccountServices.cs file. Listing 6-2. Complete IAccountServices.cs File using System; using System.Workflow.Activities; namespace SharedWorkflows { /// <summary> /// Defines account services that are available to workflows /// </summary> [ExternalDataExchange] public interface IAccountServices { /// <summary> /// Adjust the balance of an account /// </summary> /// <param name="id"></param> /// <param name="adjustment"></param> /// <returns>Account</returns> Account AdjustBalance(Int32 id, Double adjustment); } } To keep this example simple, only a single method is defined. The AdjustBalance method accepts an account ID and the amount of the adjustment that should be applied to the account. Notice that the interface is decorated with the ExternalDataExchangeAttribute. This is required in order to add a local service to the workflow runtime. This attribute identifies the interface as a local service contract and the class that implements it as a local service. If you attempt to add an object to the workflow runtime that doesn t include this attribute on its interface, an exception is thrown.

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