Convert List to Dataset in C#

Question

I am trying to Convert List to Dataset(Set of DataTables). But When I try this I got only 1 table. but according to my model It has to be 5 Tables. can anyone please advise me on this.

My Matrix Model

 public class MatrixModel
    {

        public class RootObject
        {

            public string responseId { get; set; }
            public string searchId { get; set; }
            public int totalFound { get; set; }
            public List<availableHotels> availableHotels { get; set; }
        }

        public class availableHotels
        {
            public string processId { get; set; }
            public string hotelCode { get; set; }
            public string availabilityStatus { get; set; }

            public double totalPrice { get; set; }
            public double totalTax { get; set; }

            public double totalSalePrice { get; set; }

            public string currency { get; set; }

            public string boardType { get; set; }
            public List<rooms> rooms { get; set; }



        }

        public class rooms
        {
            public string roomCategory { get; set; }
            public List<paxes> paxes { get; set; }
            public double totalRoomRate { get; set; }
            public List<ratesPerNight> ratesPerNight { get; set; }
        }

        public class paxes
        {
            public string paxType { get; set; }
            public int age { get; set; }


        }

        public class ratesPerNight
        {
            public string date { get; set; }
            public double amount { get; set; }
        }
    }

Convert Json Response to List

   List<MatrixModel.RootObject> ddd = JsonConvert.DeserializeObject<List<MatrixModel.RootObject>>("["+tstobj+"]");

Convert List to Dataset

---

DataSet dvv=ddd.ToDataSet<MatrixModel.RootObject>();


public static class ListConverter
    {

        /// <summary>
        /// Convert our IList to a DataTable
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="list"></param>
        /// <returns>DataTable</returns>
        public static DataTable ToDataTable<T>(this IEnumerable<T> list)
        {
            Type elementType = typeof(T);
            using (DataTable t = new DataTable())
            {
                PropertyInfo[] _props = elementType.GetProperties();
                foreach (PropertyInfo propInfo in _props)
                {
                    Type _pi = propInfo.PropertyType;
                    Type ColType = Nullable.GetUnderlyingType(_pi) ?? _pi;
                    t.Columns.Add(propInfo.Name, ColType);
                }
                foreach (T item in list)
                {
                    DataRow row = t.NewRow();
                    foreach (PropertyInfo propInfo in _props)
                    {
                        row[propInfo.Name] = propInfo.GetValue(item, null) ?? DBNull.Value;
                    }
                    t.Rows.Add(row);
                }
                return t;
            }
        }

        /// <summary>
        /// Convert our IList to a DataSet
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="list"></param>
        /// <returns>DataSet</returns>
        public static DataSet ToDataSet<T>(this IEnumerable<T> list)
        {
            using (DataSet ds = new DataSet())
            {
                ds.Tables.Add(list.ToDataTable());
                return ds;
            }
        }



    }

---

I got only One DataTable .

Answer 1

The main problem is that you want to convert hierarchical data to relational and that can not be done this easily. For example in your current hierarchical model you store a List of availableHotels for each RootObject , but in a relational DB (like a DataSet ) you should store all the availableHotels objects in a separate table then add a RootObjectId column to this table and for each row set it to the id of the RootObject object that is the parent of the availableHotels stored in this row. And so on for the rest of your data.

This will need a totally different approach than the one you used in your code.

And of course you shouldn't put using on the newly created objects if you want to return and use them outside your method because it will dispose them.