DataRow.ItemArray 没有值并且为空

Question

my DataRow object is emtpy no matter how I try to initialize it. Here is the source code:

private DataTable ReadFileIntoDb(MemoryStream file)
    {
        

        file.Position = 0;
        var sr = new StreamReader(file,Encoding.GetEncoding(1251),true);


        var dt = new DataTable();
        Console.WriteLine("datatable success");

        dt.Columns.Add(new DataColumn("description", typeof(String)));
        dt.Columns.Add(new DataColumn("code", typeof(String)));
        dt.Columns.Add(new DataColumn("cardnumber", typeof(String)));
        dt.Columns.Add(new DataColumn("costcentrecode", typeof(int)));
        dt.Columns.Add(new DataColumn("costcentre", typeof(String)));
        dt.Columns.Add(new DataColumn("article_description", typeof(String)));
        dt.Columns.Add(new DataColumn("trans_date", typeof(DateTime)));
        dt.Columns.Add(new DataColumn("article_price", typeof(Double)));
        dt.Columns.Add(new DataColumn("article_quantity", typeof(Double)));
        dt.Columns.Add(new DataColumn("netto", typeof(Double)));
        dt.Columns.Add(new DataColumn("brutto", typeof(Double)));
        dt.Columns.Add(new DataColumn("mwst", typeof(Double)));
        dt.Columns.Add(new DataColumn("beleg", typeof(Double)));
        dt.Columns.Add(new DataColumn("oberverkaufsgruppe", typeof(int)));


        dt.Columns.Add(new DataColumn("house", typeof(String)));
        dt.Columns.Add(new DataColumn("id", typeof(String)));


        //1. row gets skipped

        string line = sr.ReadLine();
        Console.WriteLine("line contains:" + line);
        line = sr.ReadLine();


        do
        {

            string[] itemArray = line.Split(';');
            DataRow row = dt.NewRow();

            row.ItemArray = itemArray; //doesnt work and throws ArgumentException    

            itemArray.CopyTo(row.ItemArray, 0); //doesnt work either

            for (int i = 0; i < 14; i++) //also doesnt work and leaves it empty
            {
                row.ItemArray[i] = itemArray[i];

                Console.WriteLine(row.ItemArray[i]);
            }


   

            row["id"] = Guid.NewGuid().ToString();
            row["house"] = "";

            dt.Rows.Add(row);


            line = sr.ReadLine();
        } while (!string.IsNullOrEmpty(line));

ReadFileIntoDb gets the content of a csv file as a parameter. Right now i reduced the csv content to only two lines which of one is just the header. The content looks like this and gets parsed successfully into var sr : Bewohner;1102284;1102284;42600;ASG ROT;Menü (Inklusivleistung);01.07.2022;0;1;;;;;2000003

As you can see this file contains 14 elements, some of which are empty. My DataTable also contains 14 columns and 2 additional which I set inside the code however and their values do not come from the csv. After performing the database operations my tables remain empty because I believe that row.ItemArray always remains empty so nothing gets added to the database. But I don't understand why it stays empty and why i get a ArgumentException. The source array itemArray is NOT empty and is also of length 14. So why does the exception get thrown if row.ItemArray is bigger in length? It has 16.

Answer 1

Look into this,I change the input string a bit

The line i added is

for (int i = 0; i < itemArray.Length; i++)
            {
                if (string.IsNullOrWhiteSpace(itemArray[i]))
                {
                    itemArray[i] = null;
                }
            }

for replacing the empty values as null in the given input, without this i got the error

Unhandled exception. System.ArgumentException: Input string was not in a correct format.Couldn't store <> in netto Column.  Expected type is Double.
 ---> System.FormatException: Input string was not in a correct format.
   at System.Number.ThrowOverflowOrFormatException(ParsingStatus status, TypeCode type)
   at System.String.System.IConvertible.ToDouble(IFormatProvider provider)
   at System.Data.Common.DoubleStorage.Set(Int32 record, Object value)
   at System.Data.DataColumn.set_Item(Int32 record, Object value)
   --- End of inner exception stack trace ---
   at System.Data.DataColumn.set_Item(Int32 record, Object value)
   at System.Data.DataRow.set_ItemArray(Object[] value)
   at Program.Main()
Command terminated by signal 6

using System;
using System.Data;
public class Program
{
    public static void Main()
    {
        string sp="Bewohner;1102284;1102284;42600;ASG ROT;Menü (Inklusivleistung);01.07.2022;0;1;;;;;2000003^Bewohner2;11022842;11022824;426200;ASG2 ROT;Menü (Inklusivleistung);01.07.2022;0;1;;;;;2000004";

        var dt = new DataTable();
        Console.WriteLine("datatable success");
        dt.Columns.Add(new DataColumn("description", typeof(String)));
        dt.Columns.Add(new DataColumn("code", typeof(String)));
        dt.Columns.Add(new DataColumn("cardnumber", typeof(String)));
        dt.Columns.Add(new DataColumn("costcentrecode", typeof(int)));
        dt.Columns.Add(new DataColumn("costcentre", typeof(String)));
        dt.Columns.Add(new DataColumn("article_description", typeof(String)));
        dt.Columns.Add(new DataColumn("trans_date", typeof(DateTime)));
        dt.Columns.Add(new DataColumn("article_price", typeof(Double)));
        dt.Columns.Add(new DataColumn("article_quantity", typeof(Double)));
        dt.Columns.Add(new DataColumn("netto", typeof(Double)));
        dt.Columns.Add(new DataColumn("brutto", typeof(Double)));
        dt.Columns.Add(new DataColumn("mwst", typeof(Double)));
        dt.Columns.Add(new DataColumn("beleg", typeof(Double)));
        dt.Columns.Add(new DataColumn("oberverkaufsgruppe", typeof(int)));


        dt.Columns.Add(new DataColumn("house", typeof(String)));
        dt.Columns.Add(new DataColumn("id", typeof(String)));

        string[] mainarray = sp.Split('^');
       for(int a=0;a<mainarray.Length;a++)
       {
            string[] itemArray = mainarray[a].Split(';');
            DataRow row = dt.NewRow();
            for (int i = 0; i < itemArray.Length; i++)
            {
                if (string.IsNullOrWhiteSpace(itemArray[i]))
                {
                    itemArray[i] = null;
                }
            }
            
            row.ItemArray = itemArray; //doesnt work and throws ArgumentException    

            itemArray.CopyTo(row.ItemArray, 0); //doesnt work either

            for (int i = 0; i < 14; i++) //also doesnt work and leaves it empty
            {
                row.ItemArray[i] = itemArray[i];

                //Console.WriteLine(row.ItemArray[i]);
            }
            row["id"] = Guid.NewGuid().ToString();
            row["house"] = "";

            dt.Rows.Add(row);
        }
        
foreach(DataRow dataRow in dt.Rows)
{var ix = 0;
    foreach(var item in dataRow.ItemArray)
    {
        Console.WriteLine(ix+"-----"+item);
        ix++;
    }
}           
    }
}

OUTPUT:

datatable success
0-----Bewohner
1-----1102284
2-----1102284
3-----42600
4-----ASG ROT
5-----Menü (Inklusivleistung)
6-----01/07/2022 00:00:00
7-----0
8-----1
9-----
10-----
11-----
12-----
13-----2000003
14-----
15-----ccf0a446-610e-4396-896d-7e8c4a43f729
0-----Bewohner2
1-----11022842
2-----11022824
3-----426200
4-----ASG2 ROT
5-----Menü (Inklusivleistung)
6-----01/07/2022 00:00:00
7-----0
8-----1
9-----
10-----
11-----
12-----
13-----2000004
14-----
15-----0c9cb9b1-8640-4626-8790-0d80fad9d8da