來自數據源的DataGridview組合框顯示

Question

表格圖像

我的數據庫中有兩個表

1. 數據表
2. KAR

數據表有兩列產品，產品類型。 kar表也有兩列類型，tax。

在我的表單中，我有一個Datagridview，其中有3列產品名，類型，稅。

Productname列是datagridviewcomboboxcolumn，它顯示數據表中的所有產品。 `

public Form5()
    {
        InitializeComponent();
    }

    private void Form5_Load(object sender, EventArgs e)
    {
        this.datatableTableAdapter.Fill(this.myBillDataSet.datatable);
        dataGridView1.EditingControlShowing += new DataGridViewEditingControlShowingEventHandler(dataGridView1_EditingControlShowing);

    }

    private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
    {
        ComboBox combo = e.Control as ComboBox;
        if (combo != null)
        {
            combo.SelectedIndexChanged -= new EventHandler(ComboBox_SelectedIndexChanged);
            combo.SelectedIndexChanged += new EventHandler(ComboBox_SelectedIndexChanged);
        }
    }
    string item = null;
    private void ComboBox_SelectedIndexChanged(object sender, EventArgs e)
    {
        SqlConnection con = new SqlConnection(@"Data Source=ZEE-PC\SQLEXPRESS;Initial Catalog=MyBill;Integrated Security=True");

        ComboBox cb = (ComboBox)sender;
        item = cb.Text;
        if (item != null)
        {
            SqlCommand cmd = new SqlCommand("select Producttype from datatable where product=@pro", con);

            cmd.Parameters.AddWithValue("@pro", item);
            con.Open();
            string val = cmd.ExecuteScalar().ToString();
            con.Close();


            SqlCommand cmd2 = new SqlCommand("select tax from kar where type=@pro2", con);

            cmd2.Parameters.AddWithValue("@pro2", val);
            con.Open();
            string val2 = cmd2.ExecuteScalar().ToString();
            con.Close();
        }

    }

當用戶從下拉列表中選擇任何產品時，類型和稅項列將顯示該值。 我正在獲取值，但無法在gridview單元中顯示

Answer 1

您可以使用列索引將值直接插入ComboBox_SelectedIndexChanged事件內的單元格中

dataGridView1.Rows[e.RowIndex].Cells[YourCellindex] = val;
dataGridView1.Rows[e.RowIndex].Cells[YourSecondCellindex] = val2;

dataGridView1.BeginEdit(true);
dataGridView1.EndEdit();

希望能幫助到你