.net core qr code reader

.net core qr code reader

.net core qr code reader

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Figure A-3. The New Sample Data dialog box allows the developer to set some data source properties. The Define New Sample Data dialog box allows you to create three key properties: Data source name: This is the name of the data source. Create data source in: This property determines the scope of the sample data. The Project scope allows the data to be used in the entire application across all XAML pages. This document scopes the data source for the current XAML file selected. Enable sample data when application is running: This property determines if the data is instantiated automatically when the application is running. Most of the time, you want this property selected. Why is there an option to turn this off and on This property should be turned off when an application goes into production because resources are consumed to instantiate sample data sources.

Once the stored procedure is defined in this way, it can be called just like any native T-SQL stored procedure..

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<Grid.RowDefinitions> <RowDefinition Height="Auto" /> <RowDefinition Height="Auto" /> </Grid.RowDefinitions> <TextBlock Text="I am running in-browser" Grid.Row="0"/> <Button x:Name="btnInstall" Grid.Row="1" Content="Install Application" Height="50" Width="150" Click="btnInstall_Click"/> </Grid> </UserControl> Listing 7-32. LocalPage.xaml <UserControl x:Class="Ch07_Networking.Recipe7_7.OfflineNoteTaker.LocalPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Width="400" Height="300"> <Grid x:Name="LayoutRoot" Background="White"> <TextBlock Text="I am running locally"/> </Grid> </UserControl> Listing 7-31 shows a XAML page named OnlinePage.xaml that you want to display when the application is running in-browser. Listing 7-32 shows LocalPage.xaml, which you want the same application to display when running locally. To detach the application, write some code as shown here in the Click handler of the Button named btnInstall in Listing 7-31: private void btnInstall_Click(object sender, RoutedEventArgs e) { if(Application.Current.InstallState == InstallState.NotInstalled) Application.Current.Install(); } You check Application.InstallState; if it indicates that the code is currently running inbrowser, you invoke the Install() method to locally install the application. You also make an additional check in the Application.StartUp event handler and load the appropriate page: private void Application_Startup(object sender, StartupEventArgs e) { if (Application.Current.IsRunningOutOfBrowser) this.RootVisual = new LocalPage();

Warning Not checking Enable sample data when application is running is one of the biggest mistakes I have seen when trying to figure out why your application is not presenting data. When attempting any of the coding scenarios in this book, always ensure that you have this option checked.

Summary

else this.RootVisual = new OnlinePage(); } Figure 7-16 shows the in-browser and locally installed versions of such an application.

After clicking OK, you will see that a dynamic data source has been created in the Data tab. In the Data tab in the data source management list, you will see the newly created sample data source. The sample data source includes a default collection and property, as shown in Figure A-4.

CLR integration allows developers to extend the functionality of SQL Server using safe, well-performing methods. Coding CLR stored procedures is an easy way to improve upon some of the things that T-SQL doesn t do especially well. In the next chapter, we ll cover the other types of CLR objects available to developers: functions, aggregates, user-defined types, and triggers. We ll also present a more in-depth look into managing routines from a DBA s perspective.

Figure 7-16. A simple application UI running in-browser and locally installed We look at using the InstallState property and installation customization in more detail in this recipe s code sample.

The status of the message. This will always be 0 for a message that has been retrieved. The full list of values is as follows: 0: Ready 1: Received message 2: Not yet complete 3: Retained sent message The number of the message within the queue. The ID of the conversation group to which this message belongs. The dialog handle for the conversation to which this message belongs. The sequence number of the message within the conversation. The name of the conversation target service. The ID of the conversation target service. The name of the contract for the conversation. Continued

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