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![09/20/20
24
Mr.S.B.Karthikeyan,Assistant Professor/Kongu Engineering College,Perundurai,Erode-6
38060.
15
Hosting a Workflow using
WorkflowInvoker
static void Main(string[] args)
{
WorkflowInvoker.Invoke(new Workflow1());
}
----------------------------------------------------------------------------
static void Main(string[] args)
{
WorkflowInvoker.Invoke(new Workflow1());
Console.WriteLine("Thanks for playing");
}](https://image.slidesharecdn.com/unitiic-240920054837-96315f4f/85/Windows-workflow-foundation-in-Net-Framework-15-320.jpg)
![09/20/20
24
Mr.S.B.Karthikeyan,Assistant Professor/Kongu Engineering College,Perundurai,Erode-6
38060.
29
import System.Collections.Generic namespace into your
file to declare the Dictionary<> variable.
static void Main(string[] args)
{
Console.WriteLine(" *Welcome to this amazing WF application
*");
Console.Write("Please enter the data to pass the workflow: ");
string wfData = Console.ReadLine();
Dictionary<string, object> wfArgs = new
Dictionary<string,object>();
wfArgs.Add("MessageToShow", wfData);
WorkflowInvoker.Invoke(new Workflow1(), wfArgs);
Console.WriteLine("Thanks for playing");
}](https://image.slidesharecdn.com/unitiic-240920054837-96315f4f/85/Windows-workflow-foundation-in-Net-Framework-29-320.jpg)
![09/20/20
24
Mr.S.B.Karthikeyan,Assistant Professor/Kongu Engineering College,Perundurai,Erode-6
38060.
32
static void Main(string[] args)
{
Console.WriteLine("***** Welcome to this amazing WF application
*****");
// Get data from user, to pass to workflow.
Console.Write("Please enter the data to pass the workflow: ");
string wfData = Console.ReadLine();
// Package up the data as a dictionary.
Dictionary<string, object> wfArgs = new Dictionary<string,object>();
wfArgs.Add("MessageToShow", wfData);
// Used to inform primary thread to wait!
AutoResetEvent waitHandle = new AutoResetEvent(false);](https://image.slidesharecdn.com/unitiic-240920054837-96315f4f/85/Windows-workflow-foundation-in-Net-Framework-32-320.jpg)
![09/20/20
24
Mr.S.B.Karthikeyan,Assistant Professor/Kongu Engineering College,Perundurai,Erode-6
38060.
48
Completing the Application
static void Main(string[] args)
{ try {
Dictionary<string, object> wfArgs = new
Dictionary<string, object>();
wfArgs.Add("UserName", "Andrew");
WorkflowInvoker.Invoke(new Workflow1(), wfArgs);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
Console.WriteLine(ex.Data["Reason"]);
} }](https://image.slidesharecdn.com/unitiic-240920054837-96315f4f/85/Windows-workflow-foundation-in-Net-Framework-48-320.jpg)
Windows workflow foundation in .Net Framework
- 1. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 1 Introducing Windows Workflow Foundation 4.0
- 2. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 2 Introduction A few years back, Microsoft shipped an API named Windows Workflow Foundation (WF) with the release of NET 3.0. This API allowed you to model, configure, monitor, and execute the workflows used internally by a given .NET program.
- 3. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 3 We were no longer required to manually develop complex infrastructure to support workflow-enabled applications. .NET 4.0 gives us a complete reboot of the entire WF API workflows are modeled using a declarative XML-based grammar named XAML
- 4. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 4 Visual Studio 2010 WF designers have been completely overhauled and rewritten using Windows Presentation Foundation (WPF) technologies. WF programming model to establish business processes that execute under the watchful eye of the WF runtime engine.
- 5. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 5 Defining a Business Process Things to be considered While building an application that allows a user to purchase an automobile online. Once the user submits the order, a large number of activities are set in motion. Credit check start a database transaction in order to remove the entry from an Inventory table add a new entry to an Orders table
- 6. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 6 update the customer account Information send a confirmation e-mail to the buyer place the order at the car dealership modeling a business process was yet another detail that programmers had to account for. code base has very little trace of the internal “flow” of the application The development team may build external documentation and workflow charts, again
- 7. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 7 The Role of WF 4.0 It allows programmers to declaratively design business processes using a prefabricated set of activities. WF designers of Visual Studio 2010 to create our business process at design time. WF allows us to build the skeleton of a business process
- 8. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 8 Building a (Painfully) Simple Workflow workflow-enabled application gives “different feel ” from building a typical .NET application. A WF application also consists of custom code you are building directly into the assembly a model of the business process itself
- 9. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 9
- 10. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 10
- 11. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 11
- 12. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 12
- 13. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 13 Viewing the Underlying XAML
- 14. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 14 The WF 4.0 Runtime WF API also consists of a runtime engine to load, execute, unload, and in other ways manipulate a workflow which you have defined. The WF runtime engine can be hosted within any .NET application domain a single application domain can only have one running instance of the WF engine.
- 15. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 15 Hosting a Workflow using WorkflowInvoker static void Main(string[] args) { WorkflowInvoker.Invoke(new Workflow1()); } ---------------------------------------------------------------------------- static void Main(string[] args) { WorkflowInvoker.Invoke(new Workflow1()); Console.WriteLine("Thanks for playing"); }
- 16. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 16 Examining the Workflow 4.0 Activities Control Flow Activities Flowchart Activities
- 17. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 17
- 18. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 18 Flow chart activities
- 19. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 19 Messaging Activities
- 20. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 20 The Runtime and Primitive Activities
- 21. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 21 Transaction Activities
- 22. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 22 The Collection and Error Handling Activities
- 23. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 23 Building a Flowchart Workflow
- 24. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 24 Connecting Activities in a Flowchart
- 25. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 25 Passing Arguments to your Workflow using WorkflowInvoker The Invoke() method has been overloaded multiple times for arguments. These arguments are represented using a Dictionary<string, object> variable that contains a set of name/value pairs that will be used to set identically named (and typed) argument variables in the workflow itself.
- 26. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 26 Defining Arguments using the Workflow Designer In Solution Explorer, right-click Workflow1.xaml and select View Designer. Bottom of the designer there is a button named Arguments Click this button now, and from the resulting UI, add an input argument of type String named MessageToShow(no need to assign a default value for this new argument).
- 27. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 27
- 28. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 28 As you are typing in this token, you’ll notice IntelliSense will kick in
- 29. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 29 import System.Collections.Generic namespace into your file to declare the Dictionary<> variable. static void Main(string[] args) { Console.WriteLine(" *Welcome to this amazing WF application *"); Console.Write("Please enter the data to pass the workflow: "); string wfData = Console.ReadLine(); Dictionary<string, object> wfArgs = new Dictionary<string,object>(); wfArgs.Add("MessageToShow", wfData); WorkflowInvoker.Invoke(new Workflow1(), wfArgs); Console.WriteLine("Thanks for playing"); }
- 30. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 30 Beyond the Invoke() method, the only other really interesting members of WorkflowInvoker would be BeginInvoke() and EndInvoke(), which allow you to start up the workflow on a secondary thread using the .NET asynchronous delegate pattern
- 31. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 31 Hosting a Workflow using WorkflowApplication Call run() method which will create new thread will be plucked from the CLR thread pool. One way to make sure the calling thread waits long enough for the background thread to finish its work is to use an AutoResetEvent object of the System.Threading namespace.
- 32. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 32 static void Main(string[] args) { Console.WriteLine("***** Welcome to this amazing WF application *****"); // Get data from user, to pass to workflow. Console.Write("Please enter the data to pass the workflow: "); string wfData = Console.ReadLine(); // Package up the data as a dictionary. Dictionary<string, object> wfArgs = new Dictionary<string,object>(); wfArgs.Add("MessageToShow", wfData); // Used to inform primary thread to wait! AutoResetEvent waitHandle = new AutoResetEvent(false);
- 33. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 33 // Pass to the workflow. WorkflowApplication app = new WorkflowApplication(new Workflow1(), wfArgs); // Hook up an event with this app. // When I’m done, notifiy other thread I’m done, // and print a message. app.Completed = (completedArgs) => { waitHandle.Set(); Console.WriteLine("The workflow is done!"); }; // Start the workflow! app.Run(); // Wait until I am notified the workflow is done. waitHandle.WaitOne(); Console.WriteLine("Thanks for playing"); }
- 34. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 34 Building a Flowchart Workflow Under the Flowchart section of your Toolbox, drag a Flowchart activity onto the designer. Next, using the Properties window, change the DisplayName property to something a tad more catchy, such as Show Machine Data Flowchart
- 35. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 35
- 36. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 36 Connecting Activities in a Flowchart the string concatenation symbol is +, not &!
- 37. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 37 Working with the InvokeMethod Activity Majority of a workflow is defined in a declarative manner using XAML Use of the InvokeMethod activity, which allows you to invoke methods of real objects at various points in your workflow.
- 38. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 38
- 39. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 39 TargetType property,which represents the name of the class that defines a static member you wish to invoke. pick the System.Console class of mscorlib.dll This will configure your InvokeMethod activity invoke the Console.ReadLine() method when this step of the workflow is reached.
- 40. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 40 Defining Workflow Wide Variables
- 41. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 41 Working with the FlowDecision Activity
- 42. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 42 Set the Condition property (using the Properties window) of your FlowDecision activity to the following code statement YesOrNo.ToUpper() = "Y"
- 43. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 43 Working with the TerminateWorkflow Activity
- 44. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 44 You can set your own exception through properties Right click -> properties or through properties window
- 45. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 45 Building the “True” Condition
- 46. 09/20/20 24 46 Working with theForEach<T> Activity Mr.S.B.Karthikeyan,Assistant Professor/Kongu Engineering College,Perundurai,Erode-638060.
- 47. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 47
- 48. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 48 Completing the Application static void Main(string[] args) { try { Dictionary<string, object> wfArgs = new Dictionary<string, object>(); wfArgs.Add("UserName", "Andrew"); WorkflowInvoker.Invoke(new Workflow1(), wfArgs); } catch (Exception ex) { Console.WriteLine(ex.Message); Console.WriteLine(ex.Data["Reason"]); } }
- 49. 09/20/20 24 Mr.S.B.Karthikeyan,Assistant Professor/Kongu EngineeringCollege,Perundurai,Erode-6 38060. 49 Output screen