Question

我有一个未绑定的DataGridView，它显示在上一个表单中选择的DataTable数据。如果我想从DataGridView中删除DataRow，我希望它能够更新DataBase。我有一些代码，但它没有正常工作，它只是删除第一行，而不是删除所选行（由于其值，我想删除它）。有没有办法获取单元格值并通过查询从DateBase中删除它？我使用的是SqlCe 3.5

private void removeBTN_Click(object sender, EventArgs e)
    {


            string tableName = Data["Quotation Name"].ToString().Trim(); //gets the table name 
            if (MessageBox.Show("Are you sure you want to remove this item? ", "Confirm Delete", MessageBoxButtons.YesNo) == DialogResult.Yes)
            {   for (int i = 0; i < dataGridView1.Rows.Count - 0; i++){

                string constring = @"Data Source=|DataDirectory|\LWADataBase.sdf";
                string Query = "delete from [" + tableName + "] where [Item Name] = @item ";
                SqlCeConnection conDataBase = new SqlCeConnection(constring);
                SqlCeCommand cmd = new SqlCeCommand(Query, conDataBase);
                cmd.Parameters.Add("@item", dataGridView1.Rows[i].Cells[0].Value.ToString());
                try
                {

                    conDataBase.Open();
                    cmd.ExecuteNonQuery();



                    //displays a system error message if a problem is found
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);

                }
                getTable(); //loads the table into the DGV



            }
        }
    }

Answer 1

private void removeBTN_Click(object sender, EventArgs e)
    {

        string tableName = Data["Quotation Name"].ToString().Trim(); //gets the table name 
        if (MessageBox.Show("Are you sure you want to remove this item? ", "Confirm Delete", MessageBoxButtons.YesNo) == DialogResult.Yes)
        {

            foreach (DataGridViewRow r in quotation_NameDataGridView.SelectedRows)
            {

                string constring = @"Data Source=|DataDirectory|\LWADataBase.sdf";
                string Query = "delete from [" + tableName + "] where [Item Name] like @item";
                SqlCeConnection conDataBase = new SqlCeConnection(constring);
                SqlCeCommand cmd = new SqlCeCommand(Query, conDataBase);
                if (r.Cells[0] != null)
                {

                    cmd.Parameters.Add("@item", r.Cells[0].Value.ToString());

                    try
                    {
                        conDataBase.Open();
                        int res = cmd.ExecuteNonQuery();
                        conDataBase.Close();
                        //displays a system error message if a problem is found
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show(ex.Message);

                    }
                }
                getTable(); //loads the table into the DGV

            }
        }
    }

从datagridview值中删除数据库中的行

1 个答案: