LicenseProviderAttribute.cs

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using System.Diagnostics.CodeAnalysis;
 
namespace System.ComponentModel;
 
[AttributeUsage(AttributeTargets.Class, AllowMultiple = false, Inherited = false)]
public sealed class LicenseProviderAttribute : Attribute
{
    public static readonly LicenseProviderAttribute Default = new LicenseProviderAttribute();
 
    [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicParameterlessConstructor)]
    private Type _licenseProviderType;
 
    [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicParameterlessConstructor)]
    private readonly string _licenseProviderName;
 
    [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicParameterlessConstructor)]
    public Type? LicenseProvider
    {
        get
        {
            if (_licenseProviderType == null && _licenseProviderName != null)
            {
                _licenseProviderType = Type.GetType(_licenseProviderName);
            }
            return _licenseProviderType;
        }
    }
 
    public override object TypeId
    {
        get
        {
            string text = _licenseProviderName;
            if (text == null && _licenseProviderType != null)
            {
                text = _licenseProviderType.FullName;
            }
            return GetType().FullName + text;
        }
    }
 
    public LicenseProviderAttribute()
        : this((string?)null)
    {
    }
 
    public LicenseProviderAttribute([DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicParameterlessConstructor)] string? typeName)
    {
        _licenseProviderName = typeName;
    }
 
    public LicenseProviderAttribute([DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicParameterlessConstructor)] Type type)
    {
        _licenseProviderType = type;
    }
 
    public override bool Equals([NotNullWhen(true)] object? value)
    {
        if (value is LicenseProviderAttribute && value != null)
        {
            Type licenseProvider = ((LicenseProviderAttribute)value).LicenseProvider;
            if (licenseProvider == LicenseProvider)
            {
                return true;
            }
            if (licenseProvider != null && licenseProvider.Equals(LicenseProvider))
            {
                return true;
            }
        }
        return false;
    }
 
    public override int GetHashCode()
    {
        return base.GetHashCode();
    }
}