Avalonia MVVM 框架
1.视图模型
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using System.Collections.ObjectModel;namespace AvaloniaMVVMDemo.ViewModels
{public partial class MainViewModel:ObservableObject{[ObservableProperty]private string _title = "Avalonia MVVM Demo"; //用标记属性[ObservableProperty]，默认生成对应的属性，如Title[ObservableProperty]private string _inputText = string.Empty;[ObservableProperty]private ObservableCollection<string> _items = new ObservableCollection<string>();[RelayCommand]private void AddItem(){if (!string.IsNullOrEmpty(InputText)) //这个InputText 即为框架默认生成的属性{Items.Add(InputText);}}[RelayCommand]private void RemoveItem(string item) //命令属性标记，则该方法为一个命令{if (item != null){Items.Remove(item);}}public MainViewModel(){Items.Add("示例项目1");Items.Add("示例项目2");}}
}
2.AXAML 部分
<Window xmlns="https://github.com/avaloniaui"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:vm="using:AvaloniaMVVMDemo.ViewModels"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"mc:Ignorable="d" d:DesignWidth="400" d:DesignHeight="500"x:Class="AvaloniaMVVMDemo.Views.MainWindow"x:DataType="vm:MainViewModel"Icon="/Assets/avalonia-logo.ico"Width="400" Height="500"Title="AvaloniaMVVMDemo"><Grid RowDefinitions="Auto,*,Auto" Margin="10"><!--输入区域--><StackPanel Grid.Row="0" Orientation="Horizontal" Spacing="5"><TextBox Text="{Binding InputText,Mode=TwoWay}" Watermark="输入新项目..." <!--默认支持Watermark-->Width="200"/><Button Content="添加"Command="{Binding AddItemCommand}" <!--正常绑定命令-->IsEnabled="{Binding InputText,Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/><!--列表区域--><ListBox Grid.Row="1"ItemsSource="{Binding Items}"Margin="0 10 0 0"><ListBox.ItemTemplate><DataTemplate><Grid ColumnDefinitions="*,Auto"><TextBlock Text="{Binding}" VerticalAlignment="Center" /><Button Grid.Column="1"Content="删除" <!--由于当前绑定数据非MainViewModel 而命令需要使用视图模型的命令，因此通过$parent[Window].DataContext.RemoveItemCommand间接绑定到了命令-->Command="{Binding $parent[Window].DataContext.RemoveItemCommand }"CommandParameter="{Binding}"Margin="5 0 0 0"/></Grid></DataTemplate></ListBox.ItemTemplate></ListBox><!--状态区域--><TextBlock Grid.Row="2" <!--这里的绑定使用数据集属性，而且指定了StringFormat 格式化数据-->Text="{Binding Items.Count,StringFormat='项目数量：{0}'}"Margin="0 10 0 0"/></StackPanel></Grid>
</Window>
