Microsoft workflow framework

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.

NET Framework 4, workflow validation errors weren't counted as build errors during the build of a workflow project. 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.

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.

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. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. What's New in Windows Workflow Foundation in.

Is this page helpful? Please rate your experience Yes No. What's New in Windows Workflow Foundation in. NET Framework 4. Getting Started Tutorial A set of walkthrough topics that introduce you to programming Windows Workflow Foundation applications.

Windows Workflow Foundation Programming A set of primer topics that you should understand to become a proficient WF programmer. Extending Windows Workflow Foundation A set of topics that discusses how to extend or customize Windows Workflow Foundation to suit your needs.

Out-of-Order Message Processing Describes configuring a service to accept out of order messages. Contract First Workflow Service Development Describes creating a workflow service based on an existing service contract.

How to: Create a workflow service that consumes an existing service contract Provides a step-by-step example of creating a workflow service using an existing service contract.

Hosting Workflow Services Overview Describes the different aspects of hosting a workflow service. Using Contracts in Workflow Describes the different types of contracts and contract inference. Report abuse. Details required :. Cancel Submit.

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