I am playing with Avalonia and I am trying to show a message box equivalent to WinForms' MessageBox.Show()
. I have found the GitHub issue that is requesting an API for that but I am wondering what people are doing in the meantime.
Do we need to implement a window or user control that acts like a message box and show it via ShowDialog ?
MessageBox.xaml
<Window xmlns="https://github.com/avaloniaui"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
x:Class="MsgBox.MessageBox" SizeToContent="WidthAndHeight" CanResize="False">
<StackPanel HorizontalAlignment="Center">
<TextBlock HorizontalAlignment="Center" Name="Text"/>
<StackPanel HorizontalAlignment="Center" Orientation="Horizontal" Name="Buttons">
<StackPanel.Styles>
<Style Selector="Button">
<Setter Property="Margin" Value="5"/>
</Style>
</StackPanel.Styles>
</StackPanel>
</StackPanel>
</Window>
MessageBox.xaml.cs
using System.Threading.Tasks;
using Avalonia.Controls;
using Avalonia.Interactivity;
using Avalonia.Markup.Xaml;
namespace MsgBox
{
class MessageBox : Window
{
public enum MessageBoxButtons
{
Ok,
OkCancel,
YesNo,
YesNoCancel
}
public enum MessageBoxResult
{
Ok,
Cancel,
Yes,
No
}
public MessageBox()
{
AvaloniaXamlLoader.Load(this);
}
public static Task<MessageBoxResult> Show(Window parent, string text, string title, MessageBoxButtons buttons)
{
var msgbox = new MessageBox()
{
Title = title
};
msgbox.FindControl<TextBlock>("Text").Text = text;
var buttonPanel = msgbox.FindControl<StackPanel>("Buttons");
var res = MessageBoxResult.Ok;
void AddButton(string caption, MessageBoxResult r, bool def = false)
{
var btn = new Button {Content = caption};
btn.Click += (_, __) => {
res = r;
msgbox.Close();
};
buttonPanel.Children.Add(btn);
if (def)
res = r;
}
if (buttons == MessageBoxButtons.Ok || buttons == MessageBoxButtons.OkCancel)
AddButton("Ok", MessageBoxResult.Ok, true);
if (buttons == MessageBoxButtons.YesNo || buttons == MessageBoxButtons.YesNoCancel)
{
AddButton("Yes", MessageBoxResult.Yes);
AddButton("No", MessageBoxResult.No, true);
}
if (buttons == MessageBoxButtons.OkCancel || buttons == MessageBoxButtons.YesNoCancel)
AddButton("Cancel", MessageBoxResult.Cancel, true);
var tcs = new TaskCompletionSource<MessageBoxResult>();
msgbox.Closed += delegate { tcs.TrySetResult(res); };
if (parent != null)
msgbox.ShowDialog(parent);
else msgbox.Show();
return tcs.Task;
}
}
}
Usage:
await MessageBox.Show(mainWindow, "Test", "Test title", MessageBox.MessageBoxButtons.YesNoCancel)
As of 2022, you can use the MessageBox.Avalonia package. Message boxes created with it have both Show
and ShowDialog
methods: https://github.com/AvaloniaCommunity/MessageBox.Avalonia/wiki/Api-0.9#ms-classes . The project's wiki has examples for popular use cases.
var messageBoxStandardWindow = MessageBox.Avalonia.MessageBoxManager.GetMessageBoxStandardWindow("title","orem ipsum dolor sit amet, consectetur adipiscing elit, sed...");
messageBoxStandardWindow.Show();
from message box avalonia nuget https://www.nuget.org/packages/MessageBox.Avalonia/0.9.0-preview#
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