c# - 索引超出范围 c# datagridview

Question

我正在尝试将 SQL 查询的结果显示到 datagridview 中，如下所示:

SqlCommand cmd;
SqlDataReader reader_;
SqlConnection ccs = new SqlConnection(MainForm._constR.ToString());

string strSQL_ = "SELECT cp.CouponNumber as cpn, cp.StopOverCode as xo, cp.ReservationBookingDesignator as RBD, cp.Carrier as carrier, cp.FlightNumber as flightNum, cp.UsedClassofService as class_of_service, cp.FlightDepartureDate as f_d_d, cp.FlightDepartureTime as f_d_t,  cp.CouponStatus as cp_stat, cp.FareBasisTicketDesignator as farebasis,  cp.NotValidBefore as val_bef,  cp.NotValidAfter as val_aft,  cp.FreeBaggageAllowance as free_bag_allow,  cp.FlightBookingStatus as f_booking_stat, cp.OriginAirportCityCode+'/'+cp.DestinationAirportCityCode as GFPA,cp.UsageOriginCode +'/'+ cp.UsageDestinationCode as usg_sector,  cp.UsageAirline as usg_airline,  cp.UsageDate as usg_date,  cp.UsageFlightNumber as usg_f_num,  cp.FrequentFlyerReference as FFP  FROM [Biatss_PC].[Pax].[SalesDocumentCoupon] as cp  JOIN [Biatss_PC].[Pax].[SalesDocumentHeader] as h on h.DocumentNumber = cp.DocumentNumber  WHERE h.DocumentNumber = '2581806273'  ";//document number to be parsed
//objCmd = new OleDbCommand(strSQL, objConnection);
cmd = ccs.CreateCommand();
ccs.Open();
cmd.CommandText = strSQL_;
reader_ = cmd.ExecuteReader();

int r_ = 0;
int c_ = 0;

if (reader_.HasRows)
    {

        while (reader_.Read())
        {

            dbgCPNlist.Rows[r_].Cells[c_].Value =  reader_["cpn"].ToString();
            c_++;

            dbgCPNlist.Rows[r_].Cells[c_].Value = reader_["xo"].ToString();
            c_++;

            dbgCPNlist.Rows[r_].Cells[c_].Value = reader_["GFPA"].ToString();
            c_++;

            dbgCPNlist.Rows[r_].Cells[c_].Value = reader_["carrier"].ToString();
            c_++;

            dbgCPNlist.Rows[r_].Cells[c_].Value = reader_["flightNum"].ToString();
            c_++;

            dbgCPNlist.Rows[r_].Cells[c_].Value = reader_["class_of_service"].ToString();
            c_++;

            dbgCPNlist.Rows[r_].Cells[c_].Value = reader_["f_d_d"].ToString();
            c_++;

            dbgCPNlist.Rows[r_].Cells[c_].Value = reader_["f_d_t"].ToString();
            c_++;

            dbgCPNlist.Rows[r_].Cells[c_].Value = reader_["cp_stat"].ToString();
            c_++;

            dbgCPNlist.Rows[r_].Cells[c_].Value = reader_["farebasis"].ToString();
            c_++;

            dbgCPNlist.Rows[r_].Cells[c_].Value = reader_["val_bef"].ToString();
            c_++;

            dbgCPNlist.Rows[r_].Cells[c_].Value = reader_["val_aft"].ToString();
            c_++;

            dbgCPNlist.Rows[r_].Cells[c_].Value = reader_["free_bag_allow"].ToString();
            c_++;

            dbgCPNlist.Rows[r_].Cells[c_].Value = reader_["f_booking_stat"].ToString();
            c_++;

            dbgCPNlist.Rows[r_].Cells[c_].Value = reader_["RBD"].ToString();
            c_++;

            dbgCPNlist.Rows[r_].Cells[c_].Value = reader_["usg_sector"].ToString();
            c_++;

            dbgCPNlist.Rows[r_].Cells[c_].Value = reader_["usg_airline"].ToString();
            c_++;

            dbgCPNlist.Rows[r_].Cells[c_].Value = reader_["usg_f_num"].ToString();
            c_++;

            dbgCPNlist.Rows[r_].Cells[c_].Value = reader_["usg_date"].ToString();
            c_++;

            dbgCPNlist.Rows[r_].Cells[c_].Value = reader_["FFP"].ToString();
            c_++;

            //so as to be able to start at column-index zero for next row
            c_ = 0;
            r_++;

        }
        ccs.Close();
    }

然而，当我运行代码时，我得到一个错误，其中第一行的列被插入说

Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

我做错了什么？

Answer 1

您通过读取 DataReader 来填充 datagridview。在这种情况下，您需要将行显式添加到 datagridview。您当前尝试访问尚不存在的行。

假设 datagridview 在开始循环时为空。只需添加:

while (reader_.Read())
            {
            dbgCPNlist.Rows.Add();
            ...