Catalog/imagecatalog/AvaloniaViews/LogoTabView.axaml.cs

using Avalonia.Controls;
using Avalonia.Media.Imaging;
using System.ComponentModel;
using System.IO;

namespace ImageCatalog_2.AvaloniaViews;

public partial class LogoTabView : Avalonia.Controls.UserControl
{
    public LogoTabView()
    {
        InitializeComponent();
        DataContextChanged += OnDataContextChanged;
    }

    private void OnDataContextChanged(object? sender, System.EventArgs e)
    {
        if (sender is not LogoTabView)
        {
            return;
        }

        if (DataContext is DataModel model)
        {
            model.PropertyChanged -= ModelOnPropertyChanged;
            model.PropertyChanged += ModelOnPropertyChanged;
            UpdateLogoPreview(model.LogoFile);
        }
    }

    private void ModelOnPropertyChanged(object? sender, PropertyChangedEventArgs e)
    {
        if (e.PropertyName == nameof(DataModel.LogoFile) && sender is DataModel model)
        {
            UpdateLogoPreview(model.LogoFile);
        }
    }

    private void UpdateLogoPreview(string? path)
    {
        var preview = this.FindControl<Avalonia.Controls.Image>("LogoPreview");
        if (preview is null)
        {
            return;
        }

        if (string.IsNullOrWhiteSpace(path) || !File.Exists(path))
        {
            preview.Source = null;
            return;
        }

        try
        {
            preview.Source = new Avalonia.Media.Imaging.Bitmap(path);
        }
        catch
        {
            preview.Source = null;
        }
    }
}