Message Dialog Class

Definition

Represents a dialog for showing messages to the user.

Windows 10 requirements

Examples

The following example shows how to add commands to a message dialog and display it. For the full code example, see Message dialog sample.

Remarks

You should use MessageDialog only when you are upgrading a Universal WindowsВ 8 app that uses MessageDialog, and need to minimize changes. For new apps in WindowsВ 10, we recommend using the ContentDialog control instead.

This class is not agile, which means that you need to consider its threading model and marshaling behavior. For more info, see Threading and Marshaling (C++/CX) and Using Windows Runtime objects in a multithreaded environment (.NET).

The dialog has a command bar that can support up to 3 commands in desktop apps, or 2 commands in mobile apps. If you don’t specify any commands, then a default command is added to close the dialog.

The dialog dims the screen behind it and blocks touch events from passing to the app’s canvas until the user responds.

Message dialogs should be used sparingly, and only for critical messages or simple questions that must block the user’s flow.

Here’s an example of a dialog created by the code in the Examples section.

Constructors

Initializes a new instance of the MessageDialog class to display an untitled message dialog that can be used to ask your user simple questions.

The dialog dims the screen behind it and blocks touch events from passing to the app’s canvas until the user responds.

Message dialogs should be used sparingly, and only for critical messages or simple questions that must block the user’s flow.

Initializes a new instance of the MessageDialog class to display a titled message dialog that can be used to ask your user simple questions.

Properties

Gets or sets the index of the command you want to use as the cancel command. This is the command that fires when users press the ESC key.

Add the commands before you set the index.

Gets an array of commands that appear in the command bar of the message dialog. These commands makes the dialog actionable.

Get this array and add UICommand objects that represent your commands to it. If the dialog is currently showing, the commands aren’t added to the command bar.

Gets or sets the message to be displayed to the user.

Gets or sets the index of the command you want to use as the default. This is the command that fires by default when users press the ENTER key.

Add the commands before you set the index.

Gets or sets the options for a MessageDialog.

Gets or sets the title to display on the dialog, if any.

Methods

Begins an asynchronous operation showing a dialog.

Message dialog in windows store

Answered by:

Question

Somebody has an example of code that using Message DIalog in a Windows store app in c# using MVVM?

If yes, could you please write it?

Thanx very much

Answers

• Marked as answer by Matt Small Microsoft employee, Moderator Tuesday, September 24, 2013 3:08 PM

All replies

You have issue with creating MessageDialog in ViewModel?

In fact that’s my code in my ViewModel:

I need before calling the LogService.PushLog method create a Message DIalog in order to ask the user if he need to finish the visit.

What do you think?

I’ve tried it doesn’t work . please have a look to my answer to Oleg.

Nothing is going to await the method EndVisit finishing as it returns void. So return a Task and in the caller to EndVisit await this method call.

In fact that’s my code in my ViewModel:

I need before calling the LogService.PushLog method create a Message DIalog in order to ask the user if he need to finish the visit.

What do you think?

NO I have this error message to the error list :

Error 1 ‘await’ requires that the type ‘Windows.Foundation.IAsyncOperation ‘ have a suitable GetAwaiter method. Are you missing a using directive for

1. To the original question, as above:

var dialog = new MessageDialog ( «I’m the View and I’ve been instructed to display this by the ViewModel.» );
await dialog . ShowAsync ();

2. For the problem with the code as it stands, as above:

Nothing is going to await the method EndVisit finishing as it returns void. So return a Task and in the caller to EndVisit await this method call.

3. You need to ask a question and then respond too in the dialog.

4. Worked example, which you could call from your implementation of ICommand if you were to use the MVVM pattern:

Beyond the scope of the original question. But hope this helps.

Hello Ben, here is my complet code with your answer :

Method

Message Dialog in Windows 8 XAML Application (Windows Store)

MessageBox.Show()

Well you will not find it; if you are doing a Windows 8 XAML Application for Windows Store. Instead you have to work on MessageDialog.

The all new Message Dialog is included in Windows.UI.Popups assembly. MSDN Describes Message Dialog here.

Normal MessageDialog

Let’s show a Message Dialog which would display a Title, a message, and a OK button.

You need to add the following lines of code.

As you see in above code; we have an error. Well it says that the method should be async. We would do that; as follows.

.

Now we would try and our first Message Dialog would look like following.

Message Dialog with 2 – 3 Buttons

Message Dialog supports addition multiple buttons; up to maximum 3. We can add the buttons in following way. We need to add commands. The UICommand would take the Button Name (Label name), and the InvokeHandler.

After adding the above buttons, let’s run the Message Dialog. Well it looked as following.

What if you need to provide Default options? Well there are two default options you can choose. Such as:

1. Default Command – Invoked when Enter key is pressed.
2. Cancel Command – Invoked when Escape key is pressed.

We could add these options by providing the index of the command. In our case:

Let’s run the Message Dialog with default options for keyboard interactions. Your Message Dialog would look like following.

Till now we have tried Message Dialog with a title and the content, well the title is always optional.

Your title less Message Dialog would look like following.

Which button did I click?

Well to know that; command is provided with a property called “Label” which is of type string.

You could put a switch case to identify each button’s Label. Something like following.

Don’ts

As you dig more; you would find that Commands is a collection which is read-only. That means you could only be able to add to the collection.

As we did before; we added maximum 3 commands to the dialog.

But if you add more than 3 commands; there would be an exception. As follows:

Hope this article helps. Thanks for reading.

Message Dialog Класс

Определение

Только для внутреннего использования в корпорации Майкрософт. Microsoft internal use only. Представляет диалоговое окно сообщения. Represents a message dialog box.

Свойства

Определяет, имеет ли окно рамку. Determines whether the window has a frame.

(Унаследовано от DialogWindowBase) HasHelpButton

Определяет, имеет ли окно кнопку справки. Determines whether the window has a help button.

(Унаследовано от DialogWindowBase) HasMaximizeButton

Определяет, имеет ли окно кнопку развертывания. Determines whether the window has a maximize button.

(Унаследовано от DialogWindowBase) HasMinimizeButton

Определяет, имеет ли окно кнопку свертывания. Determines whether the window has a minimize button.

(Унаследовано от DialogWindowBase) IsCloseButtonEnabled

Определяет, должна ли быть включена кнопка «закрыть строку заголовка». Determines whether the close title bar button should be enabled.

(Унаследовано от DialogWindowBase)

Методы

Инициализирует Мессажедиалог. Initializes the MessageDialog.

Вызывает справку для окна диалога. Invokes the Help for the dialog window.

(Унаследовано от DialogWindow) OnClosed(EventArgs)

Обрабатывает событие Closed. Handles the Closed event.

При переопределении в производном классе обрабатывает событие, происходящее при изменении темы диалогового окна. When overridden in a derived class, handles the event raised when the dialog window theme has changed.

(Унаследовано от DialogWindowBase) OnSourceInitialized(EventArgs)

Обрабатывает событие, возникающее, когда источник окна был инициализирован. Handles the event raised when the window source has been initialized.

(Унаследовано от DialogWindowBase) Show(String, String, MessageDialogCommandSet)

Отображает окно сообщения. Shows a message box.

Отображает окно сообщения. Shows a message box.

Получает родительский объект или владельца диалогового окна из оболочки Visual Studio и отображает диалоговое окно. Gets the parent or owner of the dialog from the Visual Studio shell and displays the dialog window. Переводит оболочку в модальное состояние, пока отображается диалог; размещает окно диалога точно по центру родительского окна. It also puts the shell in a modal state while the dialog is displayed, and centers the dialog window correctly in the parent window.

What is the message dialog “Search for app in the Store?” in Windows Phone 8.1 WebView

I’m applying a WebView made for android and ios to Windows Phone 8.1.
But in the Windows Phone 8.1, a weird message dialog is launched everytime I navigate a page.
What html code cause this? I want the dialog not to launch.

2 Answers 2

That dialog appears when you try to launch a URI scheme or file type for which there is no handler installed on the device. Either the web page is attempting to navigate to a URI with an unrecognized scheme (mycustomscheme:some_parameters) or it’s trying to download a file with an unrecognized file extension (somefile.myfiletype).

I encountered a similar kind of problem a few days earlier. Actually windows phone useragent strings are like this :

Mozilla/5.0 (Mobile; Windows Phone 8.1; Android 4.0; ARM; Trident/7.0; Touch; rv:11.0; IEMobile/11.0; NOKIA; Lumia 520) like iPhone OS 7_0_3 Mac OS X AppleWebKit/537 (KHTML, like Gecko) Mobile Safari/537

You can see there is Android and IPhone too in this string so I was working on a angular app and it was recognizing the device as a Iphone device and sending protocol like this ez:scancode which was the reason why the problem was there in the first place.

Make sure your device is right and secondly the reason of the error is that you are sending a protocol other than http/https. You need to identify from where this protocol is raised.