MarshalByValueComponent.cs

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namespace System.ComponentModel;
 
[Designer("System.Windows.Forms.Design.ComponentDocumentDesigner, System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", "System.ComponentModel.Design.IRootDesigner, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089")]
[DesignerCategory("Component")]
[TypeConverter(typeof(ComponentConverter))]
public class MarshalByValueComponent : IComponent, IDisposable, IServiceProvider
{
    private static readonly object s_eventDisposed = new object();
 
    private ISite _site;
 
    private EventHandlerList _events;
 
    protected EventHandlerList Events => _events ?? (_events = new EventHandlerList());
 
    [Browsable(false)]
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
    public virtual ISite? Site
    {
        get
        {
            return _site;
        }
        set
        {
            _site = value;
        }
    }
 
    [Browsable(false)]
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
    public virtual IContainer? Container => _site?.Container;
 
    [Browsable(false)]
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
    public virtual bool DesignMode => _site?.DesignMode ?? false;
 
    public event EventHandler? Disposed
    {
        add
        {
            Events.AddHandler(s_eventDisposed, value);
        }
        remove
        {
            Events.RemoveHandler(s_eventDisposed, value);
        }
    }
 
    ~MarshalByValueComponent()
    {
        Dispose(disposing: false);
    }
 
    public void Dispose()
    {
        Dispose(disposing: true);
        GC.SuppressFinalize(this);
    }
 
    protected virtual void Dispose(bool disposing)
    {
        if (disposing)
        {
            lock (this)
            {
                _site?.Container?.Remove(this);
                ((EventHandler)(_events?[s_eventDisposed]))?.Invoke(this, EventArgs.Empty);
            }
        }
    }
 
    public virtual object? GetService(Type service)
    {
        return _site?.GetService(service);
    }
 
    public override string? ToString()
    {
        ISite site = _site;
        if (site != null)
        {
            return site.Name + " [" + GetType().FullName + "]";
        }
        return GetType().FullName;
    }
}