ReadOnlyAttribute.cs

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