在C＃中迭代数据行

Question

In Selected dataRow I have totally 200 data record rows. Now I need to divide the 200 records into 20 [10 times(for loop)]. so I use the take(20).It will take first 20 records.

I need to remove the first 20 records in last and need to choose another 20 records.I need to execute the 10 times for loop and get all the 200 records.

DataRow[] selectedDataRow = dtSMSDetails.Select("description = '" + smsDescription + "'");

if (selectedDataRow.Length > 0)
{
    string smsRecordId = "";
    string mobileNum = "";
    string smsSubject = "";

    foreach (DataRow rows in selectedDataRow.Take(20)) 
    {
        smsRecordId += rows["activityid"].ToString() + ",";
        smsSubject = rows["subject"].ToString();
        mobileNum += rows["telephone1"].ToString() + ",";
        // Here I need to remove the first 20 (take 20) records from the selected data row and need to loop next 20 records. 
    }
}

Answer 1

You can use Skip()

int startIndex = 0;

for (int i = 0; i < 10; i++)
{
    foreach (DataRow rows in selectedDataRow.Skip(startIndex).Take(20))
    {
        smsRecordId += rows["activityid"].ToString() + ",";
        smsSubject = rows["subject"].ToString();
        mobileNum += rows["telephone1"].ToString() + ",";
    }

    startIndex += 20;
}

Read more