Question

你们中任何人都可以在stackoverflow上解释我为什么我的组合框没有显示任何项目。我有一个组合框从另一个获取值，因此它只显示特定项目，在这种情况下，项目是座位行。我试图设置一个breakpoit，看看它是否为null，而不是它得到正确的值。但由于某种原因，组合框不显示项目？你们任何人都可以帮助我吗？

这是第一个组合框selectIndex事件：

private void cbBookedSeatMovDate_SelectedIndexChanged(object sender, EventArgs e)
{
    ServiceReferenceMovieRunTime.MovieRunTimeServiceClient movRunService = new ServiceReferenceMovieRunTime.MovieRunTimeServiceClient();

    string _selectedMovName = Convert.ToString(cbBookedSeatMovInfo.SelectedValue);
    string _selectedMovDate = Convert.ToString(cbBookedSeatMovDate.SelectedValue);

    cbBookedSeatMovTime.DataSource = movRunService.GetRunTimeOnMovNameAndDate(_selectedMovName, _selectedMovDate);
    cbBookedSeatMovTime.ValueMember = "id";
    cbBookedSeatMovTime.DisplayMember = "startTime";
}

这是组合框事件不能正常工作：

private void cbBookedSeatMovTime_SelectedIndexChanged(object sender, EventArgs e)
{
    ServiceReferenceMovieRunTime.MovieRunTimeServiceClient movRunService = new ServiceReferenceMovieRunTime.MovieRunTimeServiceClient();
    ServiceReferenceSeats.SeatsServiceClient seatService = new ServiceReferenceSeats.SeatsServiceClient();

    string _selectedMovTime = Convert.ToString(cbBookedSeatMovTime.SelectedValue);
    string _selectedMovName = Convert.ToString(cbBookedSeatMovInfo.SelectedValue);
    string _selectedMovDate = Convert.ToString(cbBookedSeatMovDate.SelectedValue);

    string _runTimeId = Convert.ToString(movRunService.GetRunTimeOnNameDateAndTime(_selectedMovName, _selectedMovDate, _selectedMovTime));



    cbRow1.DataSource = seatService.GetRowsOnRunTime(Convert.ToInt32(_runTimeId.First()));
    cbRow1.ValueMember = "id";
    cbRow1.DisplayMember = "rowId";

}

这是LINQ查询：

public List<TheaterSeat> GetRowsOnRunTime(int RunTime)
{
    var queryResult = (from x in db.TheaterSeats
                        where x.runTime == RunTime
                        select x);
    return queryResult.ToList();
}

希望你们能帮助我！

Combobox没有显示项目？的WinForms

0 个答案: