DesignerAttribute.cs

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using System.Diagnostics.CodeAnalysis;
 
namespace System.ComponentModel;
 
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Interface, AllowMultiple = true, Inherited = true)]
public sealed class DesignerAttribute : Attribute
{
    private string _typeId;
 
    [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicParameterlessConstructor)]
    public string DesignerBaseTypeName { get; }
 
    [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicParameterlessConstructor)]
    public string DesignerTypeName { get; }
 
    public override object TypeId
    {
        get
        {
            if (_typeId == null)
            {
                string text = DesignerBaseTypeName ?? string.Empty;
                int num = text.IndexOf(',');
                if (num != -1)
                {
                    text = text.Substring(0, num);
                }
                _typeId = GetType().FullName + text;
            }
            return _typeId;
        }
    }
 
    public DesignerAttribute([DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicParameterlessConstructor)] string designerTypeName)
    {
        DesignerTypeName = designerTypeName ?? throw new ArgumentNullException("designerTypeName");
        DesignerBaseTypeName = "System.ComponentModel.Design.IDesigner, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089";
    }
 
    public DesignerAttribute([DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicParameterlessConstructor)] Type designerType)
    {
        if (designerType == null)
        {
            throw new ArgumentNullException("designerType");
        }
        DesignerTypeName = designerType.AssemblyQualifiedName;
        DesignerBaseTypeName = "System.ComponentModel.Design.IDesigner, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089";
    }
 
    public DesignerAttribute([DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicParameterlessConstructor)] string designerTypeName, [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicParameterlessConstructor)] string designerBaseTypeName)
    {
        DesignerTypeName = designerTypeName ?? throw new ArgumentNullException("designerTypeName");
        DesignerBaseTypeName = designerBaseTypeName;
    }
 
    public DesignerAttribute([DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicParameterlessConstructor)] string designerTypeName, [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicParameterlessConstructor)] Type designerBaseType)
    {
        if (designerTypeName == null)
        {
            throw new ArgumentNullException("designerTypeName");
        }
        if (designerBaseType == null)
        {
            throw new ArgumentNullException("designerBaseType");
        }
        DesignerTypeName = designerTypeName;
        DesignerBaseTypeName = designerBaseType.AssemblyQualifiedName;
    }
 
    public DesignerAttribute([DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicParameterlessConstructor)] Type designerType, [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicParameterlessConstructor)] Type designerBaseType)
    {
        if (designerType == null)
        {
            throw new ArgumentNullException("designerType");
        }
        if (designerBaseType == null)
        {
            throw new ArgumentNullException("designerBaseType");
        }
        DesignerTypeName = designerType.AssemblyQualifiedName;
        DesignerBaseTypeName = designerBaseType.AssemblyQualifiedName;
    }
 
    public override bool Equals(object? obj)
    {
        if (obj == this)
        {
            return true;
        }
        if (obj is DesignerAttribute designerAttribute && designerAttribute.DesignerBaseTypeName == DesignerBaseTypeName)
        {
            return designerAttribute.DesignerTypeName == DesignerTypeName;
        }
        return false;
    }
 
    public override int GetHashCode()
    {
        return HashCode.Combine(DesignerBaseTypeName, DesignerTypeName);
    }
}