uwp barcode scanner c#

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Figure A-6. Data source management options At the highest level is the data source object. Clicking the database icon with the wrench displays the menu shown in Figure A-7. The sample data source management options available to you are as follows: Reimport Sample Data from XML: This option allows you to refresh your data from an XML file. Enable When Running Application: This option is equivalent to the Enable sample data when application is running option that selected when you created the data source. This option allows you to manage whether the data source is enabled when the application is running. Remove [sample data source name] : This option removes the sample data source from the project.

The code sample for this recipe builds a simple note-taking application that allows the user to take notes that have a title and a body, and stores them on the server categorized by the date the note was taken. The application can also be installed locally; the user can operate the locally installed application even when disconnected from the network, by providing a local note store. The user can then synchronize the local note store with the server when network connectivity is restored.

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By default, the RECEIVE statement will return an empty result set if no messages are present in the queue. You can alter this behavior by wrapping the statement in a WAITFOR statement: WAITFOR ( RECEIVE ... ) [, TIMEOUT timeout] This causes the RECEIVE statement to wait for the timeout period (in milliseconds) until a message arrives. If the timeout period expires, an empty result set will be returned. To wait indefinitely, omit the TIMEOUT clause, or specify a value of 1.

Figure A-7. Sample data source management options The second level in the data source hierarchy is the data source class. In this section, you manage the collections and properties that belong to a data source. Clicking the plus icon (Add Simple Property) brings up the menu shown in Figure A-8.

When your application wants to close the conversation, both sides should explicitly end the dialog: END CONVERSATION dialog_handle [WITH ERROR = error_code DESCRIPTION = error_description] [WITH CLEANUP] Use the WITH ERROR clause if you want to throw an error, passing in an error code (of type int) and description (of type nvarchar(3000)). This will cause Service Broker to send an Error message to the queue, which can then be handled by the other participant in the conversation. If the END CONVERSATION command is issued without a WITH ERROR clause, Service Broker places an End Dialog message on the queue to inform the remote service that the conversation is closed. However, the remote application still needs to end its side of the conversation. Once it has done this, Service Broker will remove all messages belonging to this conversation from the queue. The WITH CLEANUP clause is used to remove any messages from a queue when it isn t possible to end the conversation normally, usually because the remote service isn t available. If the conversation is ended WITH CLEANUP, the remote service isn t informed that the conversation is ending.

Figure 7-17. NoteTaker application running in-browser The application displays the currently stored notes in a TreeView control, with the top-level nodes displaying the dates containing individual nodes for each note stored on that date. The user can use the buttons on the UI (from left to right) to, respectively, install the application locally, to synchronize any notes stored offline with the server version of notes data, create a new note, save a note, or remove a selected note. (Note that when you run the application locally installed, the install button is not displayed.) The small Ellipse to the left of the buttons is colored green to indicate network availability and red otherwise. Figure 7-18 shows the application running from a locally installed state. The ellipse at the bottom of the window shows network availability (green when available, red when not). A WCF service acts as the datasource for the application. The WCF service uses the file system to store notes. Each note file is named with the unique ID of the note and is stored in a folder named after the date the note was created, along with other notes that have the same creation date. We do not go through the details of the service implementation in this recipe, but you are encouraged to look at the sample code, as well as Recipe 7.1, for more details of WCF integration with Silverlight.

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