Serenity.Data.Row.IsAssigned C# (CSharp) Method

        public bool IsAssigned(Field field)
        {
            if (assignedFields == null)
                return false;

            return assignedFields[field.index];
        }

        protected void CheckUnassignedRead(Row row)
        {
            if (row == null)
            {
                throw new ArgumentNullException("row");
            }

            if (!row.tracking)
            {
                return;
            }

            if (!row.trackWithChecks)
            {
                return;
            }

            if (row.IsAssigned(this))
            {
                return;
            }

            if (!this.GetIsNull(row))
            {
                return;
            }

            throw new InvalidOperationException(String.Format(
                                                    "{0} field on {1} is read before assigned a value!", this.Name, row.GetType().Name));
        }