在selectedIndexChanged事件上访问comboBox的值

Question

我有一个comboBox和SelectedItemChanged事件。所以我想提取所选项目的值，例如：

private void cboCustomerType_SelectedIndexChanged(object sender, EventArgs e)
{
    var db = new SQLConnMgr();

    ComboBox cmb = (ComboBox)sender;
    var comboSelectedValue = cmb.SelectedItem;
}

问题是我想要的价值在cmb.SelectedItem.Row.ItemArray[1]上

但是我无法访问cmb.SelectedItem.Row。为什么我做不到这么简单：cmb.SelectedItem.Row.ItemArray[1]？问候

Answer 1

您选择的项目类型是DataRowView，因此您需要将SelectedItem强制转换为该类型：

private void cboCustomerType_SelectedIndexChanged(object sender, EventArgs e)
{
    // A combobox with nothing selected will have a SelectedIndex of -1
    if (cboCustomerType.SelectedIndex > -1)
    {
        // Cast SelectedItem to DataRowView
        DataRowView item = cboCustomerType.SelectedItem as DataRowView;

        if (item != null)
        {
            // Access the data in column 1 of the selected row
            string value = item[1].ToString();
        }
    }
}

Answer 2

我相信您正在将组合框与DataSet绑定。因此，您可以这样做：

DataRow dataRow = dataSet.Select(string.Format("FieldName = '{0}'",     ComboBox.SelectedValue.ToString()))[0];

if (ComboxBox.SelectedValue != null)
{

// can use fields like 

String text = dataRow[“fieldName”].ToString();
}

else
{ //something wrong
}
}