Convert a List<string> to DataRow in c#

Question

I have a list of strings and am in need of converting it to a Datarow. I tried

toReturn.Add("UserID");
toReturn.Add("UserName");
DataRow row = null;
row.ItemArray=toreturn.ToArray();

This is throwing me an exception

Object reference not set to an instance of an object.

So i tried with

DataRow Row=new DataRow();

That is also not allowed.Can somebody help me in this.

Answer 1

DataRow s can only exist with a DataTable .

Create a DataTable with appropriate columns, then call table.Rows.Add(list.ToArray()) .

However, you probably shouldn't be using DataRow in the first place.

Answer 2

You can create DataRow object inside DataTable like SLaks pointed out. Whatever the reason for it...

DataTable dataTable = new DataTable();
dataTable.Columns.Add("Test");

foreach(string x in array)
{
    DataRow dataRow = dataTable.NewRow();   
    dataRow["Test"] = x;   
    dataTable.Rows.Add(dataRow);               
}

Now you can do whatever you want with your DataTable object...

Answer 3

You might be required NewRow() to create new DataRow :

DataRow row = _dataTable.NewRow();

Check _dataTable in your code.

Answer 4

Try this, its working for me!!!

using System;

using System.Collections.Generic;

using System.Data;

using System.Linq;

using System.Text;

using System.Threading.Tasks;


namespace testApp

{

 class Program

 {

    static void Main(string[] args)

    {
        List<string> toReturn = new List<string>();

        toReturn.Add("UserID");
        toReturn.Add("UserName");

        DataTable dt = new DataTable();
        dt.Columns.Add(new DataColumn("UserID"));
        dt.Columns.Add(new DataColumn("UserName"));

        DataRow row = dt.NewRow();
        row.ItemArray = toReturn.ToArray();
        dt.Rows.Add(row);
    }
 }
}

Answer 5

string [] array=new string[length]{1,2,3,...}

DataTable dt=new DataTable();

DataRow toInsert = dt.NewRow();

toInsert.ItemArray = array;

dt.Rows.InsertAt(toInsert, desiredrownumber);

Answer 6

If your List<string[]> has the first row of the list as header, you can do something like this:

var header = records.Select(it => it).First().ToList();
var values = records.Select(it => it).Skip(1).ToList();
foreach (var item in header)
    dataTable.Columns.Add(item, typeof(string));

foreach (object[] value in values) 
    dataTable.Rows.Add(value);

return dataTable;