andyw27
asked on
Copy rows from Datatable
Hi,
If I have datatable that looks like this:
Col 1 Col 3 Col 4 Col 5
1001 906 581 403
1001 538 822 330
1001 354 837 982
1001 649 861 955
1001 499 673 286
2005 803 899 594
2005 994 385 463
2005 279 272 141
3006 275 945 396
3006 448 392 180
3006 286 842 678
3006 802 718 880
(The real world example has thousands of records.)
I need to create a function that accepts an int (in this case Col 1) and returns a new datatable contains just the rows the match col 1. For example if I passed 2005 I would expect the new datatable to look like this:
2005 803 899 594
2005 994 385 463
2005 279 272 141
Looking for the most efficient means of doing this?
If I have datatable that looks like this:
Col 1 Col 3 Col 4 Col 5
1001 906 581 403
1001 538 822 330
1001 354 837 982
1001 649 861 955
1001 499 673 286
2005 803 899 594
2005 994 385 463
2005 279 272 141
3006 275 945 396
3006 448 392 180
3006 286 842 678
3006 802 718 880
(The real world example has thousands of records.)
I need to create a function that accepts an int (in this case Col 1) and returns a new datatable contains just the rows the match col 1. For example if I passed 2005 I would expect the new datatable to look like this:
2005 803 899 594
2005 994 385 463
2005 279 272 141
Looking for the most efficient means of doing this?
ASKER CERTIFIED SOLUTION
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Try this i hope it will help you.
private void button1_Click(object sender, EventArgs e)
{
DataTable dt = new DataTable();
dt.Columns.Add(new DataColumn("Col1"));
dt.Columns.Add(new DataColumn("Col2"));
dt.Columns.Add(new DataColumn("Col3"));
dt.Rows.Add(new object[] { 2005, 803, 899 });
for (int i = 0; i < 4; i++)
{
//loop here to calculate or get values.
AddToDataTable(2006, ref dt);
}
}
private void AddToDataTable(int colValue, ref DataTable dt)
{
//do calculations here for 830,900 values
string colValues = string.Format("{0},{1},{2}
dt.Rows.Add(colValues.Spli
}
private void button1_Click(object sender, EventArgs e)
{
DataTable dt = new DataTable();
dt.Columns.Add(new DataColumn("Col1"));
dt.Columns.Add(new DataColumn("Col2"));
dt.Columns.Add(new DataColumn("Col3"));
dt.Rows.Add(new object[] { 2005, 803, 899 });
for (int i = 0; i < 4; i++)
{
//loop here to calculate or get values.
AddToDataTable(2006, ref dt);
}
}
private void AddToDataTable(int colValue, ref DataTable dt)
{
//do calculations here for 830,900 values
string colValues = string.Format("{0},{1},{2}
dt.Rows.Add(colValues.Spli
}
private DataTable GetDTByFilter(DataTable dt, int col, int match)
{
string expression;
expression = "Col" + col.ToString() + "=" + match.ToString();
DataRow[] foundRows;
foundRows = dt.Select(expression);
return (foundRows.CopyToDataTable
}