join 2 datarow rows into one row C#

Question

while i know i can make a join of 2 rows via sql, my program doesn\'t use it i have 2 datatables and i take each row, compare to the rows on the other table and want to make

Answer 1

Alright all you mad lads out there, I think I've cracked it.

This is what I came up with for my problem, a bit of a pain in arse way of doing things, but it got the two datarows as one which is what I wanted.

Could not find anything as a default that did this, but please do let me know if it exists.

private DataRow JoinDataRow(DataRow r1, DataRow r2)
{
    // Get table columns
    var r1Cols = r1.Table.Columns;
    var r2Cols = r2.Table.Columns;

    // Create datatable to base row from
    var tempDataTable = new DataTable();
    foreach (DataColumn col in r1Cols)
    {
        tempDataTable.Columns.Add(new DataColumn(col.ColumnName, col.DataType, col.Expression, col.ColumnMapping));
    }

    foreach (DataColumn col in r2Cols)
    {
        tempDataTable.Columns.Add(new DataColumn(col.ColumnName, col.DataType, col.Expression, col.ColumnMapping));
    }

    // Create new return row to be returned
    DataRow returnRow = tempDataTable.NewRow();

    // Fill data
    int count = 0;
    for (int r1Index = 0; r1Index < r1Cols.Count; r1Index ++)
    {
        returnRow[r1Index] = r1[r1Index];
        count++;
    }

    for (int r2Index = count; r2Index < r2Cols.Count + count; r2Index++)
    {
        returnRow[r2Index] = r2[r2Index -count];
    }

    // Return row
    return returnRow;
}

An instance of how you could use it is perhaps using LINQ to join two separate data tables together and you want the rows to act accordingly, see example below:

var memberCompanyDetails = 
    (from DataRow member in members.Rows
    join DataRow company in companies.Rows on member["company"] equals company["company"]
    select JoinDataRow(member, company)).AsEnumerable().CopyToDataTable();