Avalonia 通知导致应用程序崩溃
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【中文标题】Avalonia 通知导致应用程序崩溃【英文标题】:Avalonia notification causes the application to crash 【发布时间】:2021-12-31 21:23:15 【问题描述】:我正在测试 Avalonia 通知(C#、Windows 10、Visual Studio Community 2019)。每当我按下按钮并更改属性“问候”时,以下代码就会崩溃。
我想问题是图片中的备注所指示的。问题是如何避免这种情况?更改 Greeting 属性的内容后如何显示通知? 代码如下:
using Avalonia;
using Avalonia.Controls;
using Avalonia.Interactivity;
using Avalonia.Markup.Xaml;
using Avalonia.Controls.Notifications;
using System;
namespace Avalonia_test_Notifications.Views
public partial class MainWindow : Window
public ViewModels.MainWindowViewModel ViewModel;
public WindowNotificationManager Manager;
public MainWindow()
InitializeComponent();
this.DataContext = ViewModel;
#if DEBUG
this.AttachDevTools();
#endif
private void InitializeComponent()
AvaloniaXamlLoader.Load(this);
Manager = new WindowNotificationManager(this);
ViewModel = new ViewModels.MainWindowViewModel(Manager);
private void ShowNotification(object sender, RoutedEventArgs e)
ViewModel.ClickEvent(sender, e);
和
using System;
using System.Collections.Generic;
using System.Text;
using ReactiveUI;
using System.Reactive;
namespace Avalonia_test_Notifications.ViewModels
public class MainWindowViewModel : ViewModelBase
private string _greeting = "Greetings";
public string Greeting
get => _greeting;
set
this.RaiseAndSetIfChanged(ref _greeting, value);
public Avalonia.Controls.Notifications.Notification Notification;
public Avalonia.Controls.Notifications.IManagedNotificationManager Manager;
public string [] stringArray;
public MainWindowViewModel(Avalonia.Controls.Notifications.IManagedNotificationManager manager)
stringArray = new string[3] "message 1", "message 2", "message 3" ;
Manager = manager;
this.WhenAnyValue(x => x.Greeting).Subscribe(x=>ShowNotification(x));
public void ClickEvent(object sender, Avalonia.Interactivity.RoutedEventArgs e)
System.Random rand = new System.Random();
int x = rand.Next(0, 3);
Greeting = stringArray[x];
public void ShowNotification(string s)
Notification = new Avalonia.Controls.Notifications.Notification("TestNotification", s, Avalonia.Controls.Notifications.NotificationType.Information, TimeSpan.FromSeconds(0));
Manager.Show(Notification);
最后:
<Window xmlns="https://github.com/avaloniaui"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:vm="using:Avalonia_test_Notifications.ViewModels"
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="Avalonia_test_Notifications.Views.MainWindow"
Icon="/Assets/avalonia-logo.ico"
Title="Avalonia_test_Notifications">
<Design.DataContext>
<vm:MainWindowViewModel/>
</Design.DataContext>
<StackPanel Orientation="Vertical">
<TextBlock Text="Binding Greeting" HorizontalAlignment="Center" VerticalAlignment="Center"/>
<Button Content="Notification" Click="ShowNotification"></Button>
</StackPanel>
</Window>
【问题讨论】:
【参考方案1】:似乎 MainWindow 在与它交互之前需要一些时间来准备。我找到的解决方案是仅在 IsActive 为真时才响应更改。我在创建 ViewModel 时传递了对 MainWindow 的引用,而不是传递对 NotificationManager 的引用。
public MainWindowViewModel(Views.MainWindow Window)
stringArray = new string[3] "message 1", "message 2", "message 3" ;
Manager = new Avalonia.Controls.Notifications.WindowNotificationManager(Window);
this.WhenAnyValue(x => x.Greeting).WhereNotNull()
.Subscribe(x=>
if (Window.IsActive)
ShowNotification(x);
);
【讨论】:
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