ToolboxItemAttribute.cs

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using System.Diagnostics.CodeAnalysis;
 
namespace System.ComponentModel;
 
[AttributeUsage(AttributeTargets.All)]
public class ToolboxItemAttribute : Attribute
{
    [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)]
    private Type _toolboxItemType;
 
    [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)]
    private readonly string _toolboxItemTypeName;
 
    public static readonly ToolboxItemAttribute Default = new ToolboxItemAttribute("System.Drawing.Design.ToolboxItem, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a");
 
    public static readonly ToolboxItemAttribute None = new ToolboxItemAttribute(defaultType: false);
 
    [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)]
    public Type? ToolboxItemType
    {
        get
        {
            if (_toolboxItemType == null && _toolboxItemTypeName != null)
            {
                try
                {
                    _toolboxItemType = Type.GetType(_toolboxItemTypeName, throwOnError: true);
                }
                catch (Exception innerException)
                {
                    throw new ArgumentException(System.SR.Format(System.SR.ToolboxItemAttributeFailedGetType, _toolboxItemTypeName), innerException);
                }
            }
            return _toolboxItemType;
        }
    }
 
    [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)]
    public string ToolboxItemTypeName => _toolboxItemTypeName ?? string.Empty;
 
    public override bool IsDefaultAttribute()
    {
        return Equals(Default);
    }
 
    public ToolboxItemAttribute(bool defaultType)
    {
        if (defaultType)
        {
            _toolboxItemTypeName = "System.Drawing.Design.ToolboxItem, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a";
        }
    }
 
    public ToolboxItemAttribute([DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)] string toolboxItemTypeName)
    {
        _toolboxItemTypeName = toolboxItemTypeName ?? throw new ArgumentNullException("toolboxItemTypeName");
    }
 
    public ToolboxItemAttribute([DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicConstructors)] Type toolboxItemType)
    {
        if (toolboxItemType == null)
        {
            throw new ArgumentNullException("toolboxItemType");
        }
        _toolboxItemType = toolboxItemType;
        _toolboxItemTypeName = toolboxItemType.AssemblyQualifiedName;
    }
 
    public override bool Equals([NotNullWhen(true)] object? obj)
    {
        if (obj == this)
        {
            return true;
        }
        if (obj is ToolboxItemAttribute toolboxItemAttribute)
        {
            return toolboxItemAttribute.ToolboxItemTypeName == ToolboxItemTypeName;
        }
        return false;
    }
 
    public override int GetHashCode()
    {
        if (_toolboxItemTypeName != null)
        {
            return _toolboxItemTypeName.GetHashCode();
        }
        return base.GetHashCode();
    }
}