ReadOnlyObservableCollection.cs

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using System.Collections.Generic;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Diagnostics;
using System.Runtime.CompilerServices;
 
namespace System.Collections.ObjectModel;
 
[Serializable]
[DebuggerTypeProxy(typeof(CollectionDebugView<>))]
[DebuggerDisplay("Count = {Count}")]
[TypeForwardedFrom("WindowsBase, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35")]
public class ReadOnlyObservableCollection<T> : ReadOnlyCollection<T>, INotifyCollectionChanged, INotifyPropertyChanged
{
    event NotifyCollectionChangedEventHandler? INotifyCollectionChanged.CollectionChanged
    {
        add
        {
            CollectionChanged += value;
        }
        remove
        {
            CollectionChanged -= value;
        }
    }
 
    protected virtual event NotifyCollectionChangedEventHandler? CollectionChanged;
 
    event PropertyChangedEventHandler? INotifyPropertyChanged.PropertyChanged
    {
        add
        {
            PropertyChanged += value;
        }
        remove
        {
            PropertyChanged -= value;
        }
    }
 
    protected virtual event PropertyChangedEventHandler? PropertyChanged;
 
    public ReadOnlyObservableCollection(ObservableCollection<T> list)
        : base((IList<T>)list)
    {
        ((INotifyCollectionChanged)base.Items).CollectionChanged += HandleCollectionChanged;
        ((INotifyPropertyChanged)base.Items).PropertyChanged += HandlePropertyChanged;
    }
 
    protected virtual void OnCollectionChanged(NotifyCollectionChangedEventArgs args)
    {
        this.CollectionChanged?.Invoke(this, args);
    }
 
    protected virtual void OnPropertyChanged(PropertyChangedEventArgs args)
    {
        this.PropertyChanged?.Invoke(this, args);
    }
 
    private void HandleCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
    {
        OnCollectionChanged(e);
    }
 
    private void HandlePropertyChanged(object sender, PropertyChangedEventArgs e)
    {
        OnPropertyChanged(e);
    }
}