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Example 7.10 using .net framework toaccess code-128c for web,windows application ASP.NET and Visual Web Developer WF includes a t barcode code 128 for .NET racking service that allows a developer to save information about a workflow s execution to the database. For example, the start date, time and end date, time of a workflow and its activities can be saved to the database.

. NOTE This section is Visual Studio .NET code-128b intentionally titled Workflow Persistence (with WF) to distinguish it from the Workflow Persistence (with AppFabric) section later in this chapter, where additional features and classes provided by Windows Server AppFabric are covered (some of which further relate to and extend WF)..

Communicating w ith the Host Container The base WF library includes the CallExternalMethod and HandleExternalEvent activities used for communication with the host based on the request-response message exchange pattern. The WF has a built-in CallExternalMethod activity, which can raise an event to be consumed by the host. The host application needs to implement an event handler for receiving response arguments from the workflow using a standard.

SOA PRINCIPLES VS .NET USS Code 128 & PATTERNS Persisting workflow logic via a database is a classic application of State Repository [785] as a result of the application of the Service Statelessness (700) principle to the task or controller service that resides within WF runtime environment..

7: .NET Enterprise Services Technologies event-or-delega code128b for .NET te pattern. The activity can also be used to send data from the workflow to the host.

The HandleExternalEvent is used by the workflow instance to capture an event raised by the host application. It is critical for the interface outside the runtime execution context to communicate with the code in the host application process. The barrier is bridged using a service designed in the runtime environment called the ExternalDataExchangeService.

This service allows you to make calls into a running workflow instance using events, and to call out from a running workflow using method calls. In order to hook up the workflow to the host service, it must contain a class that implements the interface that is intended for communications. This interface will use the ExternalDataExchange attribute to signal the workflow designer and runtime that this interface is intended for communication between the host and workflow.

Once all these code artifacts are defined, the CallExternalMethod and HandleExternalEvent activities can be hooked up to the host service using the WF designer. Activities A workflow is a sequence of activities executed by the workflow engine. An activity should be modeled as a real-world action required for completing a parent business process.

An activity is a class that encapsulates logic and can potentially be reused across different workflows. WF includes several activities known as the base activity library. Activities from the base activity library are commonly used with sequential workflows (Table 7.

3).. Activity IfElse Description allows conditio ANSI/AIM Code 128 for .NET ns to be specified in the workflow and the runtime engine evaluates each condition and acts upon it based on the result (the IfElse activity can contain other IfElse activities and a default IfElse activity if no other condition is met) accepts a condition and evaluates it at the beginning of every iteration (if the condition is true, the child activity is run repeatedly until the condition becomes false) executes a child activity a given number of times (similar to the foreach statement in C#) Looping and Synchronization. While Replicator 7.2 Windows Wor kflow Foundation (WF). Description Activity Sequence is used to exec ute a group of activities, one at a time, in a predefined order executes two or more sequences of activities in parallel or in an interleaved manner (all sequence activities must be completed before the workflow moves to the next activity) is used to idle the workflow process and wait for a wake-up call (the Listen activity is typically used when human interaction is required it serializes the workflow and goes into a passive mode when it is waiting for human intervention and upon receiving an event, it reactivates the workflow and continues with the processing logic) is implemented by using the EventDriven activity (a Listen activity must contain EventDriven activities and child activities that represent human events) is invoked when an event specified in an interface is raised (the HandleExternalEvent activity is used by WF to communicate with an external service) is used to suspend the execution of the workflow for a specified amount of time allows source code to be injected directly into the workflow (it fires the ExecuteCode event that executes the code, plus this activity can call an external assembly) is used to call a method in a class available to the workflow (the interface and its implementation must be available in the same assembly) invokes another workflow to start executing.
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