The StatusMessage property is initially set in the XAML on the main window. This needs to be fixed and is what you're going to learn to do in the next section. Click the Close button and notice that the status message does NOT go back to the previous status message. Run the application, click on the Login menu and notice that the status message on the main window changes. #Wpf passwordbox text condition code#In the case of the code snippet above, the text Login to Application is displayed on the main window. The DisplayStatusMessage() method uses the message broker to send a DISPLAY_STATUS_MESSAGE with the text sent to this method. public class LoginViewModel : ViewModelBaseĭisplayStatusMessage("Login to Application") In this constructor, send a status message using the DisplayStatusMessage() method that's a part of the ViewModelBase class. Open the LoginViewModel.cs file and add a constructor to this class. When you load a user control, set the status message to the text you want to display on the main window. _viewModel.StatusMessage = e.MessagePayload.ToString() Ĭase MessageBrokerMessages.CLOSE_USER_CONTROL: private void Instance_MessageReceived(object sender, MessageBrokerEventArgs e)Ĭase MessageBrokerMessages.DISPLAY_STATUS_MESSAGE: Because the StatusMessage property is bound to the text block control on the main window, modifying this property updates the UI and displays the text. Open the file and modify the Instance_MessageReceived event to respond to the DISPLAY_STATUS_MESSAGE event and set the StatusMessage property on the main window's view model class. Use the message broker system to send a message to display in the text block on the main window. You can also use this StatusMessage property to display status messages from anywhere in your application such as classes, windows, or user controls.įigure 1: Add a status message area to display messages from user controls. The main window uses this text block to display information about the current user control displayed. This StatusMessage property is bound to a text block control at the bottom of the main window ( Figure 1). In the MainWindowViewModel.cs file, there's a property named StatusMessage. This series of articles is also a course that you may view at. Download the samples that go with the blog post to follow along step-by-step with this article. Instead of starting completely from scratch, I've created a starting architecture that you can learn about by reading the blog post entitled “An Architecture for WPF Applications” located at. #Wpf passwordbox text condition how to#This article is the second in a multipart series on how to create a WPF business application. #Wpf passwordbox text condition password#The user name and password data is validated and appropriate validation messages are displayed to the user. Finally, you'll create a WPF login screen with an image, a title area, and input fields for a user name and password. A timer will be used to have these informational messages disappear after a specific amount of time. You're going to reuse the splash screen area that you built in Part 1 to display informational messages. In Part 2 of this series, you're going to display a status message by sending a message from a View Model class to the main window. You also learned how to load and close user controls on a main window. You added code to display a message while loading resources in the background. In Part 1 of this series on building WPF business applications, you learned to create a new WPF business application using a pre-existing architecture.
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