C# AvaloniaUI动态显示图片的实现示例

dotnet new install Avalonia.Templates
dotnet new avalonia.app -n AvaloniaImageDemo

<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="AvaloniaUI 图片显示示例">
    <StackPanel>
        <Image x:Name="PreviewImage" Width="300" Height="300"/>
        <Button Content="选择图片" Click="OnLoadImageClick"/>
    </StackPanel>
</Window>

using Avalonia;
using Avalonia.Controls;
using Avalonia.Input;
using Avalonia.Media.Imaging;
using Avalonia.Platform;
using System.IO;
using System.Threading.Tasks;

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }

    private async void OnLoadImageClick(object sender, RoutedEventArgs e)
    {
        // 打开文件选择对话框
        var dialog = new OpenFileDialog();
        dialog.Filters.Add(new FileDialogFilter { Name = "图片文件", Extensions = { "jpg", "png", "bmp" } });
        var result = await dialog.ShowAsync(this);

        if (result != null && result.Length > 0)
        {
            var filePath = result[0];
            await LoadImageAsync(filePath);
        }
    }

    private async Task LoadImageAsync(string filePath)
    {
        // 异步加载图片
        using (var stream = File.OpenRead(filePath))
        {
            var bitmap = new Bitmap(stream);
            PreviewImage.Source = bitmap;
        }
    }
}

private void LoadEmbeddedImage()
{
    var assets = AvaloniaLocator.Current.GetService<IAssetLoader>();
    using (var stream = assets.Open(new Uri("avares://AvaloniaImageDemo/Assets/sample.png")))
    {
        var bitmap = new Bitmap(stream);
        PreviewImage.Source = bitmap;
    }
}