Beginning WF: Windows Workflow in .NET 4.0

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NET Framework 4, this customization is only supported by the shell bar at the bottom of the designer. NET Framework 4, connections between nodes in a Flowchart workflow had to be added manually. Dropping an activity on one of these points automatically adds the activity along with the necessary connection. The following screenshot shows the attachment points that become visible when an activity is dragged from the toolbox. Activities can also be dragged onto connections between flowchart nodes and states to auto-insert the node between two other nodes.

Beginning WF: Windows Workflow in .NET 4.0 (Expert's Voice in .NET)

The following screenshot shows the highlighted connecting line where activities can be dragged from the toolbox and dropped. To facilitate developing larger workflows, the designer now supports adding annotations to help keep track of the design process. Annotation can be added to activities, states, flowchart nodes, variables and arguments. The following screenshot shows the context menu used to add annotations to the designer.

Beginning WF: Windows Workflow in .NET 4.0 (Expert's Voice in .Net)

NET Framework 4, non-activity elements could not support debug breakpoints since they were not units of execution. This release provides a mechanism for adding breakpoints to State objects. When a breakpoint is set on a State , execution will break when the state is transitioned to, before its entry activities or triggers are scheduled. Activities in.

NET Framework 4 used ActivityDelegate objects to expose execution points where other parts of the workflow could interact with a workflow's execution, but using these execution points usually required a fair amount of code.


In this release, developers can define and consume activity delegates using the workflow designer. For more information, see How to: Define and consume activity delegates in the Workflow Designer. This meant that building a workflow project could succeed even when there were workflow validation errors. NET Framework 4, workflows were validated as a foreground process, which could potentially block the UI during complex or time-consuming validation processes.

What's New in Windows Workflow Foundation in .NET | Microsoft Docs

Workflow validation now takes place on a background thread, so that the UI is not blocked. This is inconvenient for developers who want to read XAML directly, or write code to remove the view state information.

.Net 4 Beta - Flowcharts and Rules in Windows Workflow

Developers can easily locate and edit the view state information of an activity, or remove the view state altogether. To preserve backward compatibility, some new features included in. This is to ensure that existing applications that use the rehosted designer are not broken by updating to the latest version.

To enable new features in the rehosted designer, either set TargetFrameworkName to ". In addition to flowchart and sequential workflow development models, this release includes State Machine workflows, and contract-first workflow services. State machine workflows were introduced as part of the.

NET Framework 4, version 4. This update included several new classes and activities which allowed developers to create state machine workflows. These classes and activities have been updated for. Updates include:. For more information on creating state machine workflows, see State Machine Workflows.

The contract-first workflow development tool allows the developer to design a contract in code first, then, with a few clicks in Visual Studio, automatically generate an activity template in the toolbox representing each operation. These activities are then used to create a workflow that implements the operations defined by the contract.

The workflow designer will validate the workflow service to ensure that these operations are implemented and the signature of the workflow matches the contract signature. The developer can also associate a workflow service with a collection of implemented contracts. For more information on contract-first workflow service development, see How to: Create a workflow service that consumes an existing service contract. Skip to main content. Exit focus mode. Theme Light. High contrast. Profile Sign out. What's New in Windows Workflow Foundation in.

NET 4. This part of your workflow should look similar. Partial workflow diagram Running the Application Press F5 to run the application. Summary WF 4. Before we leave this section, however, I want you to understand this particular scenario. In the last four chapters, you built a workflow that takes a data structure as an input, performs some complex processing on it, and returns a value back to the application that invoked it. This might not be what you would intuitively think of as a typical use of WF.

However, using this approach, each of the various steps is broken into concrete operations, and the whole process can be viewed in a graphic representation. There is very little code written, and the code is extremely modularized. For example, you could implement a different method for calculating the discount; you simply have to modify the InvokeMethod and change the MethodName.

In these last four chapters, you also used some of the basic building blocks for designing more complex workflows. Features such as passing arguments and using custom classes will be used throughout the rest of this book. For the sample application, you will build a solution used by a public library to request a book to be transferred from another branch.

The same application will both send a request to another branch as well as respond to requests from other branches. Creating the Project Start by creating a new project using the Console Application template, as shown in Figure Use LibraryReservation as the project name and Chapter08 as the solution. From the. Activities Define the Messages You will start by creating the classes that will define the messages between the applications.

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Enter the name as Reservation. In the Reservation. Serialization; using System. The definition of the Branch class is shown in Listing Enter it inside the LibraryReference namespace. Remove the blank Reservation class that was generated by the template. Several constructors are provided for ease of use.

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I added the region markers around the constructors so they can be collapsed to make the code more readable. Now add the definition of the ReservationRequest class, as shown in Listing It also includes a Branch class that represents the branch that is requesting the book. MessageContract Because the ReservationRequest class will be used to define the outgoing message, the MessageContract attribute indicates that this class will be included in a SOAP envelope. This allows for greater platform interoperability between clients and servers.

There is also a MessageBodyMember attribute on each of the public properties. Now enter the implementation for the ReservationResponse class, as shown in Listing It also contains a Branch class that represents the branch that fulfilled the request. ServiceContract To define a WCF endpoint, there are three pieces of information that must be specified: binding, address, and contract. The address indicates where the endpoint can be found, and the type of address used will depend on the binding. The contract is specified by a ServiceContract, which is an interface that defines the methods that are available at the endpoint.

So far, you have defined the messages, which will be passed as parameters in the service methods. Now add the interface definition shown in Listing to the same Reservation.

Press F6 to build the project and fix any compiler errors. Application Configuration As I mentioned earlier, you will run multiple copies of this application, each one representing a different branch location. To make that work, the branch details will be stored in a configuration file. Each copy of the application will have its own configuration file that contains its specific attributes. You can use the default name of App. See Figure Adding an application configuration file Enter the configuration details using the example shown in Listing Setting Up the app.

The Request Address defines the port number that requests will be sent to.

Beginning WF: Windows Workflow in .NET 4.0 Beginning WF: Windows Workflow in .NET 4.0
Beginning WF: Windows Workflow in .NET 4.0 Beginning WF: Windows Workflow in .NET 4.0
Beginning WF: Windows Workflow in .NET 4.0 Beginning WF: Windows Workflow in .NET 4.0
Beginning WF: Windows Workflow in .NET 4.0 Beginning WF: Windows Workflow in .NET 4.0
Beginning WF: Windows Workflow in .NET 4.0 Beginning WF: Windows Workflow in .NET 4.0
Beginning WF: Windows Workflow in .NET 4.0 Beginning WF: Windows Workflow in .NET 4.0
Beginning WF: Windows Workflow in .NET 4.0 Beginning WF: Windows Workflow in .NET 4.0
Beginning WF: Windows Workflow in .NET 4.0 Beginning WF: Windows Workflow in .NET 4.0

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