MessageBox Class

public class MessageBox : TemplatedControl

type MessageBox = 
    class
        inherit TemplatedControl
    end

Inheritance

Object    AvaloniaObject    Animatable    StyledElement    Visual    Layoutable    Interactive    InputElement    Control    TemplatedControl    MessageBox

A MessageBox is a rectangular area that is displayed typically at the top (in terms of Z-axis) of the visual tree. When displayed, it blocks the entire user interface thus forcing user to interact with it. It is used to display a message to the user and give him options on how to act to the displayed message. The user can act only by pressing a button at which point MessageBox gets dismissed (hides itself) and the application continues execution based on which button user pressed.

MessageBox is typically used in one of these 4 scenarios:

• To display an informational message. In such case MessageBox will typically contain just one button which the user is supposed to press once he read the message. The button would typically contain a confirmation text, such as "OK" or "Dismiss" suggesting, that the user acknowledged the displayed message.
• To display a question to the user. In such case MessageBox will typically contain several buttons, each representing a different answer to the question. Depending on what answer user chooses, program would continue respecting the user's choice. Typically MessageBox would display two buttons - "Yes" and "No", or "Abort" and "Retry".
• To display a warning message. A warning usually indicates, that software is headed into an error state, but the error has no yet ocurred.
• To display an error message. An error message would typically by accompanied with just one button, such as "OK". Alternatively the program may give user choices on how to deal with the error (typically, abort the entire operation, retry, skip current operation step, etc.).

As an alternative to "standard" MessageBox buttons which appear under the text message, MessageBox is capable to displaying a "Close" button in its upper-right corner. The button can be used to dismiss it, if the current use-case permits its dimissal.

MessageBox supports displaying of at most 4 different buttons.

MesssageBox is capable of displaying a title text.

MessageBox contains a built-in ContextMenu which can be invoked by right-clicking its body text. The ContextMenu gives the user a functionality to copy MessageBox text into clipboard.

To invoke a MessageBox use its Show(String, String, String, ActionMessageBoxDismissedEventArgs, Boolean, MessageBoxIconEnum) method.

Reference