add: 简单搞个依赖注入，以后有需要再改

Author: chenxuuu

llcomNext/LLCOM/App.axaml.cs

@@ -1,10 +1,12 @@
+using System;
 using Avalonia;
 using Avalonia.Controls.ApplicationLifetimes;
 using Avalonia.Data.Core;
 using Avalonia.Data.Core.Plugins;
 using Avalonia.Markup.Xaml;
 using LLCOM.ViewModels;
 using LLCOM.Views;
+using Microsoft.Extensions.DependencyInjection;
 
 namespace LLCOM
 {
@@ -17,14 +19,25 @@ public override void Initialize()
 
         public override void OnFrameworkInitializationCompleted()
         {
+            var collection = new ServiceCollection();
+            ServiceProvider? serviceProvider = null;
+            
+            collection.AddSingleton<MainWindowViewModel>();
+            collection.AddSingleton<MainViewModel>();
+
+            //用于获取别的ViewModel
+            collection.AddSingleton<Func<Type, ViewModelBase?>>(x => type => serviceProvider!.GetService(type) as ViewModelBase);
+            
+            serviceProvider = collection.BuildServiceProvider();
+            
             if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
             {
                 // Line below is needed to remove Avalonia data validation.
                 // Without this line you will get duplicate validations from both Avalonia and CT
                 BindingPlugins.DataValidators.RemoveAt(0);
                 desktop.MainWindow = new MainWindow
                 {
-                    DataContext = new MainWindowViewModel(),
+                    DataContext = serviceProvider.GetService<MainWindowViewModel>()
                 };
             }
 

llcomNext/LLCOM/ViewModels/MainViewModel.cs

@@ -6,7 +6,7 @@
 
 namespace LLCOM.ViewModels;
 
-public partial class MainViewModel : ViewModelBase
+public partial class MainViewModel(Func<Type, ViewModelBase?> getService) : ViewModelBase
 {
 
 }

llcomNext/LLCOM/ViewModels/MainWindowViewModel.cs

@@ -1,14 +1,14 @@
-using CommunityToolkit.Mvvm.ComponentModel;
+using System;
+using CommunityToolkit.Mvvm.ComponentModel;
 using System.Threading.Tasks;
+using Microsoft.Extensions.DependencyInjection;
 
 namespace LLCOM.ViewModels
 {
 
-    public partial class MainWindowViewModel : ViewModelBase
+    public partial class MainWindowViewModel(Func<Type, ViewModelBase?> getService) : ViewModelBase
     {
-        public MainWindowViewModel()
-        {
-
-        }
+        [ObservableProperty]
+        private MainViewModel _mainViewModel = (MainViewModel)getService(typeof(MainViewModel))!;
     }
 }

llcomNext/LLCOM/Views/MainWindow.axaml

@@ -1,18 +1,19 @@
 <Window
+    Height="800"
+    Icon="/Assets/llcom-logo.ico"
+    Title="LLCOM Next"
+    Width="1200"
+    WindowStartupLocation="CenterScreen"
+    mc:Ignorable="d"
     x:Class="LLCOM.Views.MainWindow"
+    x:DataType="vm:MainWindowViewModel"
     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"
     xmlns:views="clr-namespace:LLCOM.Views"
     xmlns:vm="using:LLCOM.ViewModels"
-    Title="LLCOM Next"
-	Height="800"
-	Width="1200"
-    x:DataType="vm:MainWindowViewModel"
-    Icon="/Assets/llcom-logo.ico"
-    WindowStartupLocation="CenterScreen"
-    mc:Ignorable="d">
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
     <!--  这里别写别的ui控件，不然跨平台会出问题  -->
-    <views:MainView />
+    <!--  绑定到MainViewModel  -->
+    <UserControl Content="{Binding MainViewModel}" />
 </Window>