[英]Index out of range c# datagridview
I am trying to display the result of an SQL query into a datagridview
as follows: 我试图将SQL查询的结果显示到
datagridview
,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();
}
However when I run the code, I get an error where the first row's column is to be inserted saying 但是,当我运行代码时,出现错误,其中第一行的列要插入
Index was out of range.
索引超出范围。 Must be non-negative and less than the size of the collection.
必须为非负数并且小于集合的大小。 Parameter name: index
参数名称:索引
What did I do wrong ? 我做错了什么 ?
You populate the datagridview
by reading a DataReader
. 您可以通过读取
DataReader
填充datagridview
。 In this case, you need to explicitly add the rows to the datagridview
. 在这种情况下,您需要将行显式添加到
datagridview
。 You currently try to access a row that doesn't exist yet. 您目前正在尝试访问尚不存在的行。
Suppose datagridview
is empty when you start the loop. 假设启动循环时
datagridview
为空。 Just add: 只需添加:
while (reader_.Read())
{
dbgCPNlist.Rows.Add();
...
Crhis Answered Why this error, but why you doing in this way? Crhis回答为什么会出现此错误,但为什么要这样做呢?
You can get DataTable by using SqlDataAdapter
and bind it directly to the GridView as below 您可以使用
SqlDataAdapter
获得DataTable并将其直接绑定到GridView,如下所示
using(var conn = new SqlConnection(connString))
{
conn.Open();
var command = new SqlCommand(sqlstring, conn);
var adapter = new SqlDataAdapter(command);
DataTable dt = new DataTable();
adapter.Fill(dt);
dbgCPNlist.DataSource = dt;
dbgCPNlist.DataBind();
}
while (reader_.Read())
{
dbgCPNlist.Rows.Add();
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();
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.