Question

我有问题。我无法将选定的数据从组合框保存到数据库中。任何人都可以提供任何意见或为什么会这样？

以下代码可让您全面了解我的问题：

private void Create_LS_Load(object sender, EventArgs e)
    {
        using (satsEntities Setupctx = new satsEntities())
        {
            cbStation.DisplayMember = "StationName";
            cbStation.ValueMember = "StationID";
            cbStation.DataSource = Setupctx.stations.ToList();

            cbLocation.DisplayMember = "LocationName";
            cbLocation.ValueMember = "LocationID";
            cbLocation.DataSource = Setupctx.locations.ToList();
        }
    }

private void btnCreate_Click(object sender, EventArgs e)
    {
        using (satsEntities Setupctx = new satsEntities())
        {
            locationstation ls = new locationstation();
            ls.stationID = cbStation.SelectedIndex;
            ls.locationID = cbLocation.SelectedIndex;
            Setupctx.locationstations.AddObject(ls);
            Setupctx.SaveChanges();

            cbStation.SelectedIndex = -1;
            cbLocation.SelectedIndex = -1;

            MessageBox.Show("New Location Station Is Created");
        }
    }

任何帮助将不胜感激。谢谢！

Answer 1

在您的create方法中，为什么要将SelectedIndex分配给ls.StationID和ls.locationID？选定的索引将为您提供所选项目的索引。我相信您对SelectedItem感兴趣，或者您可以使用Text财产。

编辑：

由于您的StationID和locationID是int，因此您可以在将SelectedItem分配给字段之前将其转换为int。（最好使用int.TryParse来避免异常）

int stationID = Convert.ToInt32(cbStation.SelectedItem.ToString());
int locationID = Convert.ToInt32(cbLocation.SelectedItem.ToString());

或

int stationID = Convert.ToInt32(cbStation.Text);
int locationID = Convert.ToInt32(cbLocation.Text);

然后

ls.stationID = stationID;
ls.locationID = locationID;

无法将数据保存到数据库中

1 个答案: