Question

我的数据库中有两个表

数据表
KAR

datatable有两列Product，Producttype。 kar表也有两列类型，税。

在我的表单中，我有一个Datagridview，包含3列Productname，type，tax。

Productname列是datagridviewcomboboxcolumn，显示来自datatable的所有产品。 `

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();
        }

    }

当用户从下拉列表中选择任何产品时，类型和税收列将显示该值。我正在获取值但无法在gridview单元格中显示

Answer 1

您可以使用列索引

直接在ComboBox_SelectedIndexChanged事件中的单元格中插入值

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

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

希望有所帮助

DataGridview Combobox显示来自数据源

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