(C#)Privateフィールドこじ開け拡張クラス

    internal static class ObjectExtension
    {
        private static FieldInfo GetPrivateField(this object target, string fieldName)
        {
            return target.GetType().GetField(fieldName, BindingFlags.NonPublic | BindingFlags.Instance);
        }

        public static T GetPrivateFieldValue<T>(this object target, string fieldName)
        {
            return (T)target.GetPrivateField(fieldName).GetValue(target);
        }

        public static object GetPrivateFieldValue(this object target, string fieldName)
        {
            return target.GetPrivateFieldValue<object>(fieldName);
        }

        public static void SetPrivateFieldValue(this object target, string fieldName, object value)
        {
            target.GetPrivateField(fieldName).SetValue(target, value);
        }
    }

自分用。