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Persisting exceptions in a partial-trust scenario is a potential security threat. To disable persisting of exceptions, an extension of type ExceptionPersistenceExtension must be added to the project in order to opt out of persisting exceptions. The following code example demonstrates how to implement this type.
If exceptions are not to be serialized, ensure that exceptions are used within a NoPersistScope. Activity authors should override CacheMetadata to avoid having the workflow runtime automatically execute reflection against the type. Arguments and child activities must be non-null, and Bind must be called explicitly. Also, instances of arguments that are of a type that is internal or private must be explicitly created in CacheMetadata to avoid being created by reflection. Types will not use ISerializable or SerializableAttribute for serialization; types that are to be serialized must support DataContractSerializer.
Expressions cannot be compiled using TextExpressionCompiler or the Visual Basic hosted compiler in partial trust, but previously compiled expressions can be run. A single assembly that uses Level 2 Transparency cannot be used in. NET Framework 4,. To make larger workflows more manageable, workflows can now be searched by keyword. This feature is only available in Visual Studio; this feature is not available in a rehosted designer. There are two kinds of searches available:.
Properties of Activity objects, FlowNode objects, State objects, Transition objects, and other custom flow-control items. Quick Find is performed on the designer's ModelItem tree. Quick Find will not locate namespaces imported in the workflow definition.
Keywords searched in workflows will match the actual content of the workflow files. The search results will be shown in Visual Studio Find Results view pane. Double-clicking the result item will navigate to the activity which contains the match in workflow designer. NET Framework 4, variables and arguments could only be deleted in the designer using the keyboard. Starting with. Since a workflow or certain container activities such as NoPersistScope can only contain a single body activity, adding a second activity required the developer to delete the first activity, add a Sequence activity, and then add both activities to the sequence activity.
The following screenshot shows the automatically created Sequence activity in the Body when a second WriteLine is dropped below the first. To more easily navigate a large workflow in the designer, pan mode can be enabled, allowing the developer to click and drag to move the visible portion of the workflow, rather than needing to use the scroll bars.
The button to activate pan mode is in the lower right corner of the designer. The following screenshot shows the pan button which is located at the bottom right corner of the workflow designer.
Multiple activities can be selected at one time, either by dragging a rectangle around them when pan mode is not enabled , or by holding down Ctrl and click the desired activities one by one. Multiple activity selections can also be dragged and dropped within the designer, and can also be interacted with using the context menu. In order to make hierarchical workflows easier to navigate, components of a workflow are shown in a tree-style outline view.
The outline view is displayed in the Document Outline view. Clicking on a node in outline view will navigate to the corresponding activity in the workflow designer, and the outline view will be updated to show activities that are selected in the designer. Skip to main content. Get Programming. Start your free trial. Buy on Amazon. Book description. The concepts and technologies that this book covers include: XAML -- Microsoft's new XML-based markup language for UI, used with WPF Windows Presentation Foundation WPF -- a new presentation framework and graphics subsystem for Windows that puts Vista-like effect in your grasp Ajax Windows Communication Foundation WCF - a new standards-based framework that enables applications to communicate across a network using a variety of protocols Workflow Foundation WF -- framework for defining, executing, and managing workflows CardSpace -- framework for managing the identities of your users You'll learn how to use each of the four frameworks alone and in concert to build a series of meaningful example applications.
Show and hide more. Table of contents Product information. When moving data in and out of an activity, specialized argument types are used to determine which direction data is moving.
Workflow state data can be explicitly persisted using the Persist activity. A host can persist an ActivityInstance without unloading it.
A workflow can specify no-persist zones while working with data that cannot be persisted, so that persistence is postponed until the no-persist zone exits. Transactions can be flowed into a workflow using TransactionScope. Tracking is more easily accomplished using TrackingParticipant. Tracking to the system event log is provided using EtwTrackingParticipant. Resuming a pending workflow is now managed using a Bookmark object. For more information, see Customizing the Workflow Design Experience.
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