ExtenderProvidedPropertyAttribute.cs

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using System.Diagnostics.CodeAnalysis;
 
namespace System.ComponentModel;
 
[AttributeUsage(AttributeTargets.All)]
public sealed class ExtenderProvidedPropertyAttribute : Attribute
{
    public PropertyDescriptor? ExtenderProperty { get; private set; }
 
    public IExtenderProvider? Provider { get; private set; }
 
    public Type? ReceiverType { get; private set; }
 
    internal static ExtenderProvidedPropertyAttribute Create(PropertyDescriptor extenderProperty, Type receiverType, IExtenderProvider provider)
    {
        return new ExtenderProvidedPropertyAttribute
        {
            ExtenderProperty = extenderProperty,
            ReceiverType = receiverType,
            Provider = provider
        };
    }
 
    public override bool Equals([NotNullWhen(true)] object? obj)
    {
        if (obj == this)
        {
            return true;
        }
        if (!(obj is ExtenderProvidedPropertyAttribute extenderProvidedPropertyAttribute))
        {
            return false;
        }
        if (extenderProvidedPropertyAttribute.ExtenderProperty == null)
        {
            return ExtenderProperty == null;
        }
        if (extenderProvidedPropertyAttribute.ExtenderProperty.Equals(ExtenderProperty) && extenderProvidedPropertyAttribute.Provider.Equals(Provider))
        {
            return extenderProvidedPropertyAttribute.ReceiverType.Equals(ReceiverType);
        }
        return false;
    }
 
    public override int GetHashCode()
    {
        return base.GetHashCode();
    }
 
    public override bool IsDefaultAttribute()
    {
        return ReceiverType == null;
    }
}