ImmutableObjectAttribute.cs

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