Uwp messagedialog

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I'm creating a simple program for reading text file on the Windows Phone. It works perfectly on the Desktop and in the Simulator. However, when testing with the actual device, the ShowAsync method fails with the message: "Value does not fall in the expected range".

This only happens if there are more than two commands registered in the dialog. Does the MessageDialog class really supports up to three commands - as the documentation suggests - or is this only applying for UWP Apps running on Desktop devices? The dialog has a command bar that can support up to 3 commands in desktop apps, or 2 commands in mobile apps.

UWP: MenuFlyout vs Popup Menu

It looks like the documentation is missing information about Mobile and really the API should do a better job here. For Mobile, if you hit the Back key you get a null return value, so you can do this not recommended coding pattern, but best I can think of :. Learn more. Ask Question. Asked 4 years, 2 months ago. Active 2 years, 10 months ago. Viewed 1k times. Maxime Labelle Maxime Labelle 3, 2 2 gold badges 21 21 silver badges 44 44 bronze badges.

Active Oldest Votes. At the moment, there is a clear statement in the docs: The dialog has a command bar that can support up to 3 commands in desktop apps, or 2 commands in mobile apps. Sad but true: on mobiles, there are two commands only. Need more? Use ContentDialog instead. Yury Schkatula Yury Schkatula 4, 2 2 gold badges 15 15 silver badges 33 33 bronze badges. DeviceFamily; if deviceFamily. That workaround works quite well. I ended up testing with ApiInformation.

IsTypePresent "Windows. HardwareButtons" to test the existence of the hardware back button. Using the existence of that API is not much better; in theory it could be added to other device families that don't have back buttons, and I don't know whether other devices that don't have the API like Xbox support three buttons.

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uwp messagedialog

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Dialogs and flyouts

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. In my Windows 8. Show to popup a message. That is gone in UWP. How can I show a message?

Yup, indeed something like that, the new method is to use the MessageDialog class. You have to create an object of that type. You can also add buttons.

It's a bit more complex I think. But you can also use some shortcuts here. To just show a message, use this:.

Dialog controls

Take a look at the Windows. MessageDialog class and try this:. It is better to put MessageDialog codes into a function that has a keyword async and returns type of Task For example:. Learn more. How do I popup in message in UWP? Ask Question. Asked 3 years, 9 months ago. Active 2 years, 1 month ago.

Viewed 6k times. Boris Pluimvee Boris Pluimvee 1 1 gold badge 3 3 silver badges 7 7 bronze badges. Please review the stackoverflow help page on asking good questions stackoverflow. Active Oldest Votes. Jessevl Jessevl 1 1 gold badge 5 5 silver badges 4 4 bronze badges. Isn't that exactly what I answered yesterday? Add new UICommand "Click me! ShowAsync. ShowAsync ; if cmdResult. AfamO AfamO 4 4 silver badges 5 5 bronze badges.

Sign up or log in Sign up using Google. Sign up using Facebook.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I've bought book "Heads up c ". Chapter 11 demands these namespaces: using Windows. System, Windows. Storage, Windows. But now my problem is scalling: The page size is set to x, these are columns:.

Title is in 1st row, content is in 2nd, button save,load is in 3rd, it looks like grid it wouldn't exist:. As far as I'm concerned, these classes work only with Universal Windows Platform. Angelin N. You need to create a UWP project to run the examples in that book, it sounds like. Much of what you're looking for does exist in WPF though.

For example, System. MessageBox gives you message boxes. File pickers are available through Microsoft. There are many equivalents between the two platforms. If you're looking to make applications for Windows 7, you need to use WPF. However if you are ok with your apps only working on Windows 10 or higher, then UWP is probably best. Learn more. MessageDialog in c wpf Ask Question. Asked 3 years, 6 months ago. Active 1 year, 9 months ago.The ContentDialog class was introduced in Windows Phone 8.

It contains a Page with a StackPanel with 4 buttons. The first button will be used to show a message dialog. It creates an instance of the MessageDialog with the Text and the Title. UICommands are added to the Commands collection of the dialog. On Mobile you can only use 2 commands so there is a DeviceFamily check in the code to prevent the app from crashing.

The DefaultCommandIndex is set to 0 which means that the first button will be invoked when you hit the Enter key. The CancelCommandIndex is set to 1 which means that the second button will be invoked when you hit the Escape key or the back button on the phone.

The result contains the Id and the Label of the invoked command. The default button has a blue background which is the accent color of my computer. When you run the app on your Windows Phone and tap the first button you get a message dialog which is in the top of the screen.

The dialog is dark because the phone has a dark theme setting. The labels of the buttons are always in lowercase. The MaxWidth property must be set to avoid problems with wide content on small devices. The Primary and Secondary buttons are initalized and use a Click event to set the result of the clicked button. You can only have one or two buttons.

The position of the dialog can differ depending the size of the app window. The OK button is only enabled when the checkbox is checked. When you run the app on your Windows Phone and tap the second button you get a content dialog which is always in the top of the screen. I expected that this would disable the primary button but it doesn't.

uwp messagedialog

You will still have to databind the checkbox to the IsPrimaryButtonEnabled property. I hope this will change in future versions. You can also use XAML instead of creating a content dialog from code. In the next example the ContentDialog is created in the MainPage.

I hope you can use this blog for your own Windows 10 apps.

Qt Documentation

You can download the sample project below. All entries in this blog are my opinion and don't necessarily reflect the opinion of my employer or sponsors.Dialogs and flyouts are transient UI elements that appear when something happens that requires notification, approval, or additional information from the user. Dialogs are modal UI overlays that provide contextual app information. Dialogs block interactions with the app window until being explicitly dismissed. They often request some kind of action from the user.

A flyout is a lightweight contextual popup that displays UI related to what the user is doing. It includes placement and sizing logic, and can be used to reveal a secondary control or show more detail about an item.

Unlike a dialog, a flyout can be quickly dismissed by tapping or clicking somewhere outside the flyout, pressing the Escape key or Back button, resizing the app window, or changing the device's orientation. Dialogs and flyouts make sure that users are aware of important information, but they also disrupt the user experience. Because dialogs are modal blockingthey interrupt users, preventing them from doing anything else until they interact with the dialog. Flyouts provide a less jarring experience, but displaying too many flyouts can be distracting.

Once you've determined that you want to use a dialog or flyout, you need to choose which one to use. Given that dialogs block interactions and flyouts do not, dialogs should be reserved for situations where you want the user to drop everything to focus on a specific bit of information or answer a question.

Flyouts, on the other hand, can be used when you want to call attention to something, but it's ok if the user wants to ignore it. Use a dialog for Expressing important information that the user must read and acknowledge before proceeding. Examples include: When the user's security might be compromised When the user is about to permanently alter a valuable asset When the user is about to delete a valuable asset To confirm an in-app purchase Error messages that apply to the overall app context, such as a connectivity error.

Questions, when the app needs to ask the user a blocking question, such as when the app can't choose on the user's behalf.

A blocking question can't be ignored or postponed, and should offer the user well-defined choices. Use a flyout for Collecting additional information needed before an action can be completed. Displaying info that's only relevant some of the time. For example, in a photo gallery app, when the user clicks an image thumbnail, you might use a flyout to display a large version of the image.

Displaying more information, such as details or longer descriptions of an item on the page. Consider the importance of the information you want to share: is it important enough to interrupt the user? Also consider how frequently the information needs to be shown; if you're showing a dialog or notification every few minutes, you might want to allocate space for this info in the primary UI instead. For example, in a chat client, rather than showing a flyout every time a friend logs in, you might display a list of friends who are online at the moment and highlight friends as they log on.

Dialogs are frequently used to confirm an action such as deleting a file before executing it. If you expect the user to perform a particular action frequently, consider providing a way for the user to undo the action if it was a mistake, rather than forcing users to confirm the action every time.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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When I lauch the App in "local machine", the dialog is well displayed. The problem seems to be that the "dialog. ShowAsync " method should be called from the UI thread. There is no way to accomplish what you want -- the back key handler requires an immediate answer handled or not but the dialog is inherently async.

You can of course choose to mark the event as Handled before you show the dialog, but then if the user says "Yes" there's no way you can then navigate away. You can of course terminate the app, but that's a bad idea see final paragraph. That said, you don't typically need this dialog because in Windows 10, backing out of an app doesn't terminate it, it just switches to the previous app or the Start menu. The user can trivially return to it via the task switcher or launching it again.

ShowAsync in the Application. UnhandledException event handler and this was the top result when I searched for an answer. I resolved the issue by setting UnhandledExceptionEventArgs. This is well documented in another SO questionbut I didn't find that answer until after I figured out the solution because I didn't realize calling the method from Application.

UnhandledException was significant. Learn more. Asked 4 years, 6 months ago. Active 19 days ago. Viewed 2k times. Visible; SystemNavigationManager. MessageDialog "Are you sure? Add new Windows. UICommand "Yes" ; dialog. Why is the app crashing? Julien Wendling Julien Wendling 81 6 6 bronze badges. Active Oldest Votes. Content as Frame; if rootFrame. RunAsync CoreDispatcherPriority. ShowAsync ; if result! Dispatcher; SystemNavigationManager. You should handle the backrequest ; e.

WindowsPhone HardwareButtons. Amine Da. You can of course terminate the app, but that's a bad idea see final paragraph That said, you don't typically need this dialog because in Windows 10, backing out of an app doesn't terminate it, it just switches to the previous app or the Start menu. Jeremiah Mercier Jeremiah Mercier 72 1 1 silver badge 9 9 bronze badges. Sign up or log in Sign up using Google.

uwp messagedialog

Sign up using Facebook. Sign up using Email and Password.A message dialog is used to inform the user, or ask the user a question. A message dialog displays a primary text to alert the user to a situation, an informative text to further explain the alert or to ask the user a question, and an optional detailed text to provide even more data if the user requests it.

A message box can also display a configurable set of buttons for accepting a user response. To show a message dialog, construct an instance of MessageDialog, set the desired properties, and call open. The user must click the OK button to dismiss the message dialog. A modal message dialog blocks the rest of the GUI until the message is dismissed. A more elaborate approach than just alerting the user to an event is to also ask the user what to do about it.

Store the question in the informative text property, and specify the buttons property to the set of buttons you want as the set of user responses. The buttons are specified by combining values using the bitwise OR operator. The display order for the buttons is platform dependent. The clicked signal passes the information of which button was clicked. The Qt Labs Platform module uses Qt Widgets as a fallback on platforms that do not have a native implementation available.

To link against the QtWidgets library, add the following to your qmake project file:. Note: Types in Qt. This property holds a combination of buttons that are used by the message dialog. The default value is MessageDialog.

See also text and informativeText. Informative text can be used to expand upon the text to give more information to the user. See also text and detailedText. See also informativeText and detailedText. Documentation contributions included herein are the copyrights of their respective owners.

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