Split DataTable without using AsEnumerable()

Question

I am writing a C# script that will be run inside another project that makes use of the C# compiler. This engine does not have System.Data.DataSetExtensions referenced nor will it be allowed to do so.

That being said I still need to take a DataTable of 100,000 rows and break it up into smaller DataSets of 10,000 rows max. Normally I would use DataExtensions with something like ..

var filteredDataTable = myDataTable.AsEnumerable().Take(10000).CopyToDataTable();

What would be an efficient way to go about this without using DataSetExtensions? Should I be resigned to using a foreach loop and copying over 10,000 rows into new DataTables?

Answer 1

Should I be resigned to using a foreach loop and copying over 10,000 rows into new DataTables?

Yes, also you may consider writing your own extension method to slice the table and reuse it wherever required. Something like below -

public DataTable  SliceTable(this DataTable dt, int rowsCount, int skipRows=0)
{
     DataTable dtResult = dt.Clone();
     for (int i = skipRows; i < dt.Rows.Count && rowsCount > 0; i++)
     {
         dtResult.ImportRow(dt.Rows[i]);
         rowsCount --;
     }

     return dtResult;
}

Uses-

DataTable myData; -- Original table
var slice1 = myData.SliceTable(1000); // get slice of first 1000 rows
var slice2 = myData.SliceTable(1000,1000); // get rows from 1001 to 2000
var slice3 = myData.SliceTable(1000,2000); // get rows from 2001 to 3000