I have this codes in my page:
protected void Page_Load(object sender, EventArgs e)
{
conn.Open();
string selectQuery = @"SELECT AVG(odometer_reading),truck_id FROM
inspection WHERE date BETWEEN '2015-12-01' AND '2016-06-01'
GROUP BY truck_id";
MySqlCommand cmd = new MySqlCommand(selectQuery, conn);
MySqlDataReader reader = cmd.ExecuteReader();
foreach (DbDataRecord rowData in reader)
{
populateTable(rowData);
}
}
private void populateTable (DbDataRecord rowData)
{
TableRow tr = new TableRow();
TableCell cell1 = new TableCell();
cell1.Text = rowData.GetString(rowData.GetOrdinal("AVG(odometer_reading)")).ToString();
tr.Cells.Add(cell1);// Error
TableCell cell2 = new TableCell();
cell2.Text = rowData.GetString(rowData.GetOrdinal("truck_id")).ToString();
tr.Cells.Add(cell2);
tbl_TruckEfficiency.Rows.Add(tr);
}
I am receiving an error of Unable to cast object of type 'System.Double' to type 'System.String'.
What could be the cause of this.
Or
Is there other way to get the AVG(odometer_reading)
to get it to cell1.text
disregarding its datatype to avoid the error. Thanks!
试试这个
cell1.Text=rowData["AVG(odometer_reading)"].ToString();
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