Foundations of WF: An Introduction to Windows Workflow by Brian Myers

By Brian Myers

Have you spent hours coding workflow on your purposes? if this is the case, the hot Microsoft home windows Workflow beginning (WF) know-how will make your lifestyles more straightforward. Foundations of WF: An creation to home windows Workflow origin introduces you to utilizing visible Studio 2005 and the home windows Workflow starting place (part of home windows Vista) to create workflow applications. The e-book starts by way of supplying you with an outline of home windows Workflow origin. Then it introduces and exhibits examples of many of the forms of workflow that may be created.

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Extra resources for Foundations of WF: An Introduction to Windows Workflow Foundation

Example text

The first step is to define the parameters that you want passed to the workflow as public write-only properties. Add two private integer variables to the Workflow1 class, one called InputValue1, and one called InputValue2. Define two public write-only properties, one called Input1 and the other called Input2. Then define the output parameter by defining a private integer called OutputResult, and a public read-only property called OutputValue. EventArgs) OutputResult = InputValue1 + InputValue2 MsgBox("Step1") End Sub This line of code adds the local variables for the input parameters together and assigns the result to the local variable for the output parameter.

Now, within the AddPurchaseOrder_ExecuteCode sub, you must build the SQL statement and execute it against the database to insert the purchase order record. Before you can interact with a database, you must determine the connection string that’s necessary. config file can hold settings that you want to use later. Click the My Project link within Solution Explorer, which opens a form with several tabs down the left side. Click the Settings tab and a new page appears. However, this page only has a link that says “This project does not contain a default settings file.

Hosting The Sub Main code is created to open an entry point into this console application. This would be the entry point for the workflow, and where the process of executing the workflow would begin. WorkflowTerminated, AddressOf OnWorkflowTerminated The two AddHandler lines of code point to two subs within the Program class that make up events that are raised by the workflow. Set() End Sub The next set of code lines creates an instance of the class WorkflowInstance. CreateWorkflow(GetType(Workflow1)) Each time a user executes the workflow from the beginning, a new instance of the workflow is created, just as a new, unique instance of a class is created when the New keyword is used with a class name.

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