validate-properties.cs

        private void ValidationConfiguration()
        {
            var fields = this.Fields.Select(x => x.Key).ToList();
            var duplicateFields = fields.GroupBy(x => x)
                .Where(g => g.Count() > 1)
                .Select(y => y.Key)
                .ToList();
            if (duplicateFields.Count > 0)
            {
                var result = string.Join(',', duplicateFields);
                throw new MyProgramException("ngx form : duplicate fields: " + result);
            }

            var properties = typeof(TEntity).GetProperties().ToList();
            if (properties.Count == this.Fields.Count)
            {
                return;
            }
            if (properties.Count > this.Fields.Count)
            {
                var propertyNames = properties.Select(x => x.Name).ToList();
                var result = string.Join(',', propertyNames.Where(x => !fields.Contains(x)));
                throw new MyProgramException("ngx form : unconfigured properties " + result);
            }
            if (this.Fields.Count > properties.Count)
            {
                var propertyNames = properties.Select(x => x.Name).ToList();
                var result = string.Join(',', fields.Where(x => !propertyNames.Contains(x)));
                throw new MyProgramException("ngx form : missing properties: " + result);
            }
        }