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CC#
Created by M. on 1/15/2024 in #help
✅ How to Retrieve the Selected Item Value from a ComboBox in C# (AvaloniaUI)
thank you very much, I will take a look
22 replies
CC#
Created by M. on 1/15/2024 in #help
✅ How to Retrieve the Selected Item Value from a ComboBox in C# (AvaloniaUI)
Ok thank you and optimization level does it change anything?
22 replies
CC#
Created by M. on 1/15/2024 in #help
✅ How to Retrieve the Selected Item Value from a ComboBox in C# (AvaloniaUI)
Thank You, i succeeded. if it can help anyone, I did it like this: 
c#
private ComboBox ComboBoxOutputFormat;


private void InitializeComponent()
    {
        AvaloniaXamlLoader.Load(this);
        ComboBoxOutputFormat = this.FindControl<ComboBox>("ComboBoxOutputFormat");
        ComboBoxOutputFormat.SelectionChanged += ComboBoxOutputFormat_SelectionChanged;
    }

    private void ComboBoxOutputFormat_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {

        string valeurSelectionnee = (ComboBoxOutputFormat.SelectedItem as ComboBoxItem)?.Content?.ToString();

        if (!string.IsNullOrEmpty(valeurSelectionnee))
        {
            Console.WriteLine($"Option sélectionnée : {valeurSelectionnee}");
        }
    }
c#
private ComboBox ComboBoxOutputFormat;


private void InitializeComponent()
    {
        AvaloniaXamlLoader.Load(this);
        ComboBoxOutputFormat = this.FindControl<ComboBox>("ComboBoxOutputFormat");
        ComboBoxOutputFormat.SelectionChanged += ComboBoxOutputFormat_SelectionChanged;
    }

    private void ComboBoxOutputFormat_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {

        string valeurSelectionnee = (ComboBoxOutputFormat.SelectedItem as ComboBoxItem)?.Content?.ToString();

        if (!string.IsNullOrEmpty(valeurSelectionnee))
        {
            Console.WriteLine($"Option sélectionnée : {valeurSelectionnee}");
        }
    }
22 replies
CC#
Created by M. on 1/15/2024 in #help
✅ How to Retrieve the Selected Item Value from a ComboBox in C# (AvaloniaUI)
Thanks, I'll look at it all
22 replies
CC#
Created by M. on 1/15/2024 in #help
✅ How to Retrieve the Selected Item Value from a ComboBox in C# (AvaloniaUI)
No description
22 replies
CC#
Created by M. on 1/12/2024 in #help
✅ Issue with Triggering View Change in Avalonia using C#
Thank you for your help, I succeeded and it works perfectly
22 replies
CC#
Created by M. on 1/12/2024 in #help
✅ Issue with Triggering View Change in Avalonia using C#
MainWindow.axaml.cs 
c#
namespace AvaloniaApp.Views
{
    public partial class MainWindow : Window
    {
        static MainWindow Instance { get; private set; }
        private readonly INavigationService _navigationService;
public MainWindow()
        {
            InitializeComponent();
            Instance = this;
_navigationService = new AvaloniaNavigationService(Locator.Current.GetService<IServiceProvider>());

            NavigateTo<HomeView>();}
        private void InitializeComponents()
        {
            AvaloniaXamlLoader.Load(this);
        }
        private void NavigateTo<T>() where T : UserControl, new()
        {
            _navigationService.NavigateToAsync(typeof(T).Name);
        }
}
c#
namespace AvaloniaApp.Views
{
    public partial class MainWindow : Window
    {
        static MainWindow Instance { get; private set; }
        private readonly INavigationService _navigationService;
public MainWindow()
        {
            InitializeComponent();
            Instance = this;
_navigationService = new AvaloniaNavigationService(Locator.Current.GetService<IServiceProvider>());

            NavigateTo<HomeView>();}
        private void InitializeComponents()
        {
            AvaloniaXamlLoader.Load(this);
        }
        private void NavigateTo<T>() where T : UserControl, new()
        {
            _navigationService.NavigateToAsync(typeof(T).Name);
        }
}
22 replies
CC#
Created by M. on 1/12/2024 in #help
✅ Issue with Triggering View Change in Avalonia using C#
QueryPropertyAttribute.cs 
c#
namespace AvaloniaApp.Navigation{
    [AttributeUsage(AttributeTargets.Class, AllowMultiple = true)]
    public class QueryPropertyAttribute : Attribute
    {
        public QueryPropertyAttribute(string name, string queryId) => (Name, QueryId) = (name, queryId);
        public string Name { get; }
        public string QueryId { get; }
    }
}
c#
namespace AvaloniaApp.Navigation{
    [AttributeUsage(AttributeTargets.Class, AllowMultiple = true)]
    public class QueryPropertyAttribute : Attribute
    {
        public QueryPropertyAttribute(string name, string queryId) => (Name, QueryId) = (name, queryId);
        public string Name { get; }
        public string QueryId { get; }
    }
}
Routing.cs 
c#
namespace AvaloniaApp.Navigation
{
    public static class Routing
    {
        private static readonly Dictionary<string, Type> _registeredRoutes = new Dictionary<string, Type>();

        public static UserControl GetOrCreateContent(string route, IServiceProvider serviceProvider) =>
            _registeredRoutes.TryGetValue(route, out var type) ?
                serviceProvider.GetService(type) as UserControl ?? throw new InvalidOperationException("") :
                throw new InvalidOperationException("");

        public static void RegisterRoute(string route, Type type)
        {
            if (string.IsNullOrEmpty(route) || !type.IsAssignableTo(typeof(UserControl)))
                throw new ArgumentException();

            _registeredRoutes.Add(route, type);
        }
    }
}
c#
namespace AvaloniaApp.Navigation
{
    public static class Routing
    {
        private static readonly Dictionary<string, Type> _registeredRoutes = new Dictionary<string, Type>();

        public static UserControl GetOrCreateContent(string route, IServiceProvider serviceProvider) =>
            _registeredRoutes.TryGetValue(route, out var type) ?
                serviceProvider.GetService(type) as UserControl ?? throw new InvalidOperationException("") :
                throw new InvalidOperationException("");

        public static void RegisterRoute(string route, Type type)
        {
            if (string.IsNullOrEmpty(route) || !type.IsAssignableTo(typeof(UserControl)))
                throw new ArgumentException();

            _registeredRoutes.Add(route, type);
        }
    }
}
22 replies
CC#
Created by M. on 1/12/2024 in #help
✅ Issue with Triggering View Change in Avalonia using C#
INavigationService.cs 
c#
namespace AvaloniaApp.Navigation
{
    public interface INavigationService
    {
        Task NavigateToAsync(string route, IDictionary<string, object>? parameters = null);
    }
}
c#
namespace AvaloniaApp.Navigation
{
    public interface INavigationService
    {
        Task NavigateToAsync(string route, IDictionary<string, object>? parameters = null);
    }
}
22 replies
CC#
Created by M. on 1/12/2024 in #help
✅ Issue with Triggering View Change in Avalonia using C#
namespace AvaloniaApp.Navigation
{
    internal class AvaloniaNavigationService : INavigationService
    {
        private readonly IServiceProvider _services;
        private UserControl? _view;
        private bool _clearNavigationStack;

        public AvaloniaNavigationService(IServiceProvider services)
        {
            _services = services;
        }

        public Task NavigateToAsync(string route, IDictionary<string, object>? parameters = null)
            => OnNavigateAsync(route, parameters);

        private async Task OnNavigateAsync(string route, IDictionary<string, object>? parameters = null)
        {
            await Task.Yield();

            var window = (Window)Avalonia.Application.Current.Windows[0];  // Use the appropriate index for your main window
            bool clearNavigationStack = route.StartsWith("//") ? _clearNavigationStack = true : false;

            var view = Routing.GetOrCreateContent(route.Substring(2), _services);
            if (parameters != null) ApplyQueryParameters(view, parameters);

            window.Content = _view = (UserControl)view;
            _clearNavigationStack = clearNavigationStack;
        }

        private void ApplyQueryParameters(object instance, IDictionary<string, object> parameters)
        {
            var t = instance.GetType();

            foreach (var attr in t.GetCustomAttributes<QueryPropertyAttribute>())
            {
                if (parameters.TryGetValue(attr.QueryId, out var value))
                {
                    var prop = t.GetProperty(attr.Name);
                    if (prop != null && prop.CanWrite && prop.PropertyType.IsAssignableFrom(value.GetType()))
                        prop.SetValue(instance, value);
                }
            }

            if (instance is IQueryAttributable attributable)
                attributable.ApplyQueryAttributes(parameters);
        }
    }
}
namespace AvaloniaApp.Navigation
{
    internal class AvaloniaNavigationService : INavigationService
    {
        private readonly IServiceProvider _services;
        private UserControl? _view;
        private bool _clearNavigationStack;

        public AvaloniaNavigationService(IServiceProvider services)
        {
            _services = services;
        }

        public Task NavigateToAsync(string route, IDictionary<string, object>? parameters = null)
            => OnNavigateAsync(route, parameters);

        private async Task OnNavigateAsync(string route, IDictionary<string, object>? parameters = null)
        {
            await Task.Yield();

            var window = (Window)Avalonia.Application.Current.Windows[0];  // Use the appropriate index for your main window
            bool clearNavigationStack = route.StartsWith("//") ? _clearNavigationStack = true : false;

            var view = Routing.GetOrCreateContent(route.Substring(2), _services);
            if (parameters != null) ApplyQueryParameters(view, parameters);

            window.Content = _view = (UserControl)view;
            _clearNavigationStack = clearNavigationStack;
        }

        private void ApplyQueryParameters(object instance, IDictionary<string, object> parameters)
        {
            var t = instance.GetType();

            foreach (var attr in t.GetCustomAttributes<QueryPropertyAttribute>())
            {
                if (parameters.TryGetValue(attr.QueryId, out var value))
                {
                    var prop = t.GetProperty(attr.Name);
                    if (prop != null && prop.CanWrite && prop.PropertyType.IsAssignableFrom(value.GetType()))
                        prop.SetValue(instance, value);
                }
            }

            if (instance is IQueryAttributable attributable)
                attributable.ApplyQueryAttributes(parameters);
        }
    }
}
22 replies
CC#
Created by M. on 1/12/2024 in #help
✅ Issue with Triggering View Change in Avalonia using C#
Hi, So I took an example from your code, and I just have two errors that I can't resolve in my AvaloniaNavigationService.cs - Cannot resolve symbol 'MainWindow' | Line : var window = (Window)Avalonia.Application.Current.MainWindow; - Cannot resolve symbol 'IQueryAttributable' | Line: if (instance is IQueryAttributable attributable) - 📂 Navigation - AvaloniaNavigationService.cs - INavigationService.cs - QueryPropertyAttribute.cs - Routing.cs My codes : AvaloniaNavigationService.cs
22 replies
CC#
Created by M. on 1/12/2024 in #help
✅ Issue with Triggering View Change in Avalonia using C#
Thank you for everything, I will try to implement that.
22 replies
CC#
Created by M. on 1/12/2024 in #help
✅ Issue with Triggering View Change in Avalonia using C#
Oh, sorry. Do you have the part of the code that corresponds to what I want to do, or it's okay, I'll look for it.
22 replies
CC#
Created by M. on 1/12/2024 in #help
✅ Issue with Triggering View Change in Avalonia using C#
Because my issue is simply that I can't change the displayed user control from another user control that is already displayed. If I click on buttons that change the user control directly from the main window, it works perfectly.
22 replies
CC#
Created by M. on 1/12/2024 in #help
✅ Issue with Triggering View Change in Avalonia using C#
Sorry, but that doesn't help me much.
22 replies
CC#
Created by M. on 1/12/2024 in #help
✅ Issue with Triggering View Change in Avalonia using C#
Thank you, I'll look into that right away.
22 replies