ToolboxItemFilterAttribute.cs

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using System.Diagnostics.CodeAnalysis;
 
namespace System.ComponentModel;
 
[AttributeUsage(AttributeTargets.Class, AllowMultiple = true, Inherited = true)]
public sealed class ToolboxItemFilterAttribute : Attribute
{
    private string _typeId;
 
    public string FilterString { get; }
 
    public ToolboxItemFilterType FilterType { get; }
 
    public override object TypeId => _typeId ?? (_typeId = GetType().FullName + FilterString);
 
    public ToolboxItemFilterAttribute(string filterString)
        : this(filterString, ToolboxItemFilterType.Allow)
    {
    }
 
    public ToolboxItemFilterAttribute(string filterString, ToolboxItemFilterType filterType)
    {
        FilterString = filterString ?? string.Empty;
        FilterType = filterType;
    }
 
    public override bool Equals([NotNullWhen(true)] object? obj)
    {
        if (obj == this)
        {
            return true;
        }
        if (obj is ToolboxItemFilterAttribute { FilterType: var filterType } toolboxItemFilterAttribute && filterType.Equals(FilterType))
        {
            return toolboxItemFilterAttribute.FilterString.Equals(FilterString);
        }
        return false;
    }
 
    public override int GetHashCode()
    {
        return FilterString.GetHashCode();
    }
 
    public override bool Match([NotNullWhen(true)] object? obj)
    {
        if (obj is ToolboxItemFilterAttribute toolboxItemFilterAttribute)
        {
            return toolboxItemFilterAttribute.FilterString.Equals(FilterString);
        }
        return false;
    }
 
    public override string ToString()
    {
        return FilterString + "," + Enum.GetName(typeof(ToolboxItemFilterType), FilterType);
    }
}