DesignOnlyAttribute.cs

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using System.Diagnostics.CodeAnalysis;
 
namespace System.ComponentModel;
 
[AttributeUsage(AttributeTargets.All)]
public sealed class DesignOnlyAttribute : Attribute
{
    public static readonly DesignOnlyAttribute Yes = new DesignOnlyAttribute(isDesignOnly: true);
 
    public static readonly DesignOnlyAttribute No = new DesignOnlyAttribute(isDesignOnly: false);
 
    public static readonly DesignOnlyAttribute Default = No;
 
    public bool IsDesignOnly { get; }
 
    public DesignOnlyAttribute(bool isDesignOnly)
    {
        IsDesignOnly = isDesignOnly;
    }
 
    public override bool Equals([NotNullWhen(true)] object? obj)
    {
        if (obj is DesignOnlyAttribute designOnlyAttribute)
        {
            return designOnlyAttribute.IsDesignOnly == IsDesignOnly;
        }
        return false;
    }
 
    public override int GetHashCode()
    {
        return IsDesignOnly.GetHashCode();
    }
 
    public override bool IsDefaultAttribute()
    {
        return IsDesignOnly == Default.IsDesignOnly;
    }
}