Question

我想从我的数据表中获取有两列的值。名称和订单时间。我想在文本框中从时间中减去相应的值。我指的是使用以下代码的数据表值。我可以在

中得到结果

string First = (mydatabaseDataSet.Tables[0].Rows[1][2].ToString());
MessageBox.Show(First);

但为什么我无法与以下代码进行比较和获取价值。感谢

private void comboBox_suburb_SelectedIndexChanged(object sender, EventArgs e)
{
    if (comboBox_suburb.SelectedValue!=null)
        if (comboBox_suburb.SelectedItem.ToString() == mydatabaseDataSet.Tables[0].Rows[i][j].ToString())
        {
            int timetosub = Convert.ToInt32(mydatabaseDataSet.Tables[0].Rows[i][j + 1]);
            totaltime = bdtime + timetosub;

            tmpk = totaltime;
            time3 = time2.AddMinutes(-tmpk);
            textBox_ordertostart.Text = time3.ToString("hh:mm tt");        
        }
    }

Answer 1

好的，所以我解决了这个问题。感谢您的反馈！

private void comboBox_suburb_SelectedIndexChanged(object sender, EventArgs e)
    {

        SqlConnection con = new SqlConnection(@"Data Source = (LocalDB)\MSSQLLocalDB; AttachDbFilename = C:\Users\WoolsValley\documents\visual studio 2015\Projects\WindowsFormsApplication17\WindowsFormsApplication17\mydatabase.mdf; Integrated Security = True");
        con.Open();
        int i = comboBox_suburb.SelectedIndex;
        int j = 1;

        comboBox_suburb.ValueMember = mydatabaseDataSet.Tables[0].Columns[1].ToString();


        if (comboBox_suburb.SelectedItem.ToString() == (mydatabaseDataSet.Tables[0].Rows[i][j].ToString())) ;

            {
                int timetosub = Convert.ToInt32(mydatabaseDataSet.Tables[0].Rows[i][j + 1]);

                totaltime = bdtime + timetosub;


                tmpk = totaltime;
                time3 = time2.AddMinutes(-tmpk);
                textBox_ordertostart.Text = time3.ToString("hh:mm tt");

            }
    }

数据表值比较

1 个答案: