DesignTimeVisibleAttribute.cs

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using System.Diagnostics.CodeAnalysis;
 
namespace System.ComponentModel;
 
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Interface)]
public sealed class DesignTimeVisibleAttribute : Attribute
{
    public static readonly DesignTimeVisibleAttribute Yes = new DesignTimeVisibleAttribute(visible: true);
 
    public static readonly DesignTimeVisibleAttribute No = new DesignTimeVisibleAttribute(visible: false);
 
    public static readonly DesignTimeVisibleAttribute Default = Yes;
 
    public bool Visible { get; }
 
    public DesignTimeVisibleAttribute(bool visible)
    {
        Visible = visible;
    }
 
    public DesignTimeVisibleAttribute()
    {
    }
 
    public override bool Equals([NotNullWhen(true)] object? obj)
    {
        if (obj == this)
        {
            return true;
        }
        if (obj is DesignTimeVisibleAttribute designTimeVisibleAttribute)
        {
            return designTimeVisibleAttribute.Visible == Visible;
        }
        return false;
    }
 
    public override int GetHashCode()
    {
        return typeof(DesignTimeVisibleAttribute).GetHashCode() ^ (Visible ? (-1) : 0);
    }
 
    public override bool IsDefaultAttribute()
    {
        return Visible == Default.Visible;
    }
}