HelpKeywordAttribute.cs

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using System.Diagnostics.CodeAnalysis;
 
namespace System.ComponentModel.Design;
 
[AttributeUsage(AttributeTargets.All, AllowMultiple = false, Inherited = false)]
public sealed class HelpKeywordAttribute : Attribute
{
    public static readonly HelpKeywordAttribute Default = new HelpKeywordAttribute();
 
    public string? HelpKeyword { get; }
 
    public HelpKeywordAttribute()
    {
    }
 
    public HelpKeywordAttribute(string keyword)
    {
        HelpKeyword = keyword ?? throw new ArgumentNullException("keyword");
    }
 
    public HelpKeywordAttribute(Type t)
    {
        if (t == null)
        {
            throw new ArgumentNullException("t");
        }
        HelpKeyword = t.FullName;
    }
 
    public override bool Equals([NotNullWhen(true)] object? obj)
    {
        if (obj == this)
        {
            return true;
        }
        if (obj != null && obj is HelpKeywordAttribute)
        {
            return ((HelpKeywordAttribute)obj).HelpKeyword == HelpKeyword;
        }
        return false;
    }
 
    public override int GetHashCode()
    {
        return base.GetHashCode();
    }
 
    public override bool IsDefaultAttribute()
    {
        return Equals(Default);
    }
}