将一系列数据行复制到另一个数据表-C＃

Question

I have a data table that contains 100 rows, I want to copy a range of rows(31st row to 50th row) to another data table.

I am following below logic.

DataTable dtNew = table.Clone();
for(int k=30; k < 50 && k < table.Rows.Count; k++)
{
     dtNew.ImportRow(table.Rows[k]);
}

Is there any better approach to do this?

Answer 1

Using LINQ you can do something like:

DataTable dtNew = table.Select().Skip(31).Take(20).CopyToDataTable();

Performance wise, using LINQ wont do any better, it however makes it more readable.

EDIT: Added handling check

int numOFEndrow = 20;
int numOfStartRow = 31;
if (table.Rows.Count > numOFEndrow +numOfStartRow)
{
    DataTable dtNew = table.Select().Skip(numOfStartRow).Take(numOFEndrow).CopyToDataTable();
}

Answer 2

If it's about readability, then a good idea would be to throw this into an extension method.
Without changing your logic:

public static class Utils
{
    public static void CopyRows(this DataTable from, DataTable to, int min, int max)
    {
        for (int i = min; i < max && i < from.Rows.Count; i++)
            to.ImportRow(from.Rows[i]);
    }
}

Then you can always reuse it without all the fancy syntax and know that it does exactly what you need if there is a concern of performance:

        DataTable dt1 = new DataTable();
        DataTable dt2 = new DataTable();
        dt1.CopyRows(dt2, 30, 50);