asp net core barcode scanner

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This example presents a workflow with the same behavior as the two previous examples (shown in Figure 18-4), but it uses the no-code authoring mode. However, using the no-code authoring mode presents a few challenges. First, the workflow requires a property definition in order to pass in a value for TheNumber as an input parameter. And the previous examples relied on a code condition and code handlers for the two CodeActivity instances. All of this code is added to the workflow class, which is something that you can t do with a no-code workflow.

Figure 4-7. The xmldap.org identity selector On first use, there are no information cards stored, so the user is prompted to create or import a new card. The xmldap.org identity selector has support for both personal/self-issued cards and managed cards, as shown in Figure 4-8.

tions. However, the methods in the AnnotationStore class work with the currently selected text in a document container. For that reason, the AnnotationStore methods are best for programmatically manipulating annotations without user interaction, while the AnnotationHelper methods are best for implementing user-initiated annotation changes (for example, adding an annotation when the user selects some text and clicks a button).

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The solution is to develop a new base workflow class (MarkupOnlyBaseWorkflow) that will be used instead of the standard SequentialWorkflowActivity. The base class will define TheNumber property and also the IsNumberPositive code condition handler. Instead of using instances of CodeActivity to write a console message, a new custom activity (WriteMessageActivity) will be developed that writes a message to the console. Instances of this custom activity will be created in the workflow markup instead of using CodeActivity. One final challenge when using no-code authoring is that a different overloaded version of the WorkflowRuntime.CreateWorkflow method must be used when you create a workflow instance. This will require changes to the WorkflowRuntimeManager class that these examples use to create workflow instances.

Before you can do anything with annotations, you need to enable the annotation service with the help of an AnnotationService and AnnotationStream object. In the example shown in Figure 19-17, it makes sense to create the AnnotationService when the window first loads. Creating the service is simple enough you just need to create an AnnotationService object for the document reader and call AnnotationService.Enable(). However, when you call Enable() you need to pass in an AnnotationStore object. The AnnotationService manages the information for your annotations, while the AnnotationStore manages the storage of these annotations. Here s the code that creates and enables annotations: ' A stream for storing annotation. Private annotationStream As MemoryStream ' The service that manages annotations. Private service As AnnotationService Protected Sub window_Loaded(ByVal sender As Object, _ ByVal e As RoutedEventArgs) ' Create the AnnotationService for your document container. service = New AnnotationService(docReader) ' Create annotation storage.

annotationStream = New MemoryStream() Dim store As New XmlStreamStore(annotationStream) ' Enable annotations. service.Enable(store) End Sub Notice that in this example, annotations are stored in a MemoryStream. As a result, they ll be discarded as soon as the MemoryStream is garbage collected. If you want to store annotations so they can be reapplied to the original document, you have two choices. You can create a FileStream instead of a MemoryStream, which ensures the annotation data is written as the user applies it. Or you can copy the data in the MemoryStream to another location (such as a file or a database record) after the document is closed.

To implement a custom workflow class, add a normal C# class to the SharedWorkflows project and name it MarkupOnlyBaseWorkflow. This class should derive from the standard SequentialWorkflowActivity and defines the property that you need (TheNumber) as well as the IsNumberPositive code condition handler. Listing 18-5 is the complete code that you need to add to the MarkupOnlyBaseWorkflow.cs file. Listing 18-5. Complete MarkupOnlyBaseWorkflow.cs File using System; using System.Workflow.Activities; namespace SharedWorkflows { public class MarkupOnlyBaseWorkflow : SequentialWorkflowActivity { public Int32 TheNumber { get; set; } public void IsNumberPositive( object sender, ConditionalEventArgs e) { e.Result = (TheNumber > 0); } } }

Figure 4-8. xmldap.org s identity selector includes managed card support. Next, the user must specify the card location, as shown in Figure 4-9.

s If you aren t sure whether annotations have been enabled for your document container, you can use Tip

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