Blog.Common.Web.Attributes.PreventCrossUserManipulationAttribute.GetUserIdProperty C# (CSharp) Method

        private static int? GetUserIdProperty(object src)
        {
            var properties = src.GetType().GetProperties();

            if (src.GetType() == typeof (User))
            {
                var userIdAsProperty = GetPropValue(src, "Id");
                return (int)userIdAsProperty;
            }

            foreach (var property in properties)
            {
                if (property.Name == "User" || property.Name == "Leader")
                {
                    var userPropName = property.Name;
                    var userValue = GetPropValue(src, userPropName);
                    if (userValue == null) return null;

                    var userIdFromObject = GetPropValue(userValue, "Id");
                    if (userIdFromObject == null) return null;
                    return (int)userIdFromObject;
                }

                if (property.Name == "UserId")
                {
                    var userIdAsProperty = GetPropValue(src, "UserId");
                    return (int) userIdAsProperty;
                }
                
                var propertyValue = GetPropValue(src, property.Name);
                if (propertyValue == null 
                    || propertyValue is string
                    || propertyValue is DateTime
                    || propertyValue.GetType().IsPrimitive
                    || propertyValue is IEnumerable
                    || propertyValue.GetType().IsArray) continue;

                var objectClass = GetPropValue(src, property.Name);
                var recursiveResult = GetUserIdProperty(objectClass);

                return recursiveResult;
            }

            return null;
        }