LocalizableAttributeProperty.cs

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using System;
using System.Reflection;
 
namespace CommandLine.Infrastructure
{
    internal class LocalizableAttributeProperty
    {
        private readonly string _propertyName;
        private PropertyInfo _localizationPropertyInfo;
        private Type _type;
        private string _value;
 
        public LocalizableAttributeProperty(string propertyName)
        {
            _propertyName = propertyName;
        }
 
        public string Value
        {
            get => GetLocalizedValue();
            set
            {
                _localizationPropertyInfo = null;
                _value = value;
            }
        }
 
        public Type ResourceType
        {
            set
            {
                _localizationPropertyInfo = null;
                _type = value;
            }
        }
 
        private string GetLocalizedValue()
        {
            if (string.IsNullOrEmpty(_value) || _type == null)
            {
                return _value;
            }
 
            if (_localizationPropertyInfo == null)
            {
                // Static class IsAbstract
                if (!_type.IsVisible)
                {
                    throw new
                        ArgumentException($"Invalid resource type '{_type.FullName}'! {_type.Name} is not visible for the parser! Change resources 'Access Modifier' to 'Public'",
                                          _propertyName
                                         );
                }
 
                PropertyInfo propertyInfo =
                    _type.GetProperty(_value, BindingFlags.Public | BindingFlags.GetProperty | BindingFlags.Static);
 
                if (propertyInfo == null ||
                    !propertyInfo.CanRead ||
                    (propertyInfo.PropertyType != typeof(string) && !propertyInfo.PropertyType.CanCast<string>()))
                {
                    throw new ArgumentException($"Invalid resource property name! Localized value: {_value}",
                                                _propertyName
                                               );
                }
 
                _localizationPropertyInfo = propertyInfo;
            }
 
            return _localizationPropertyInfo.GetValue(null, null)
                                            .Cast<string>();
        }
    }
}