如何将值从Datagridview传递到c＃中的组合框？

Question

I have Datagridview and combobox . I need to send data from Datagridview to combobox (I need that for update that data and return it back to Datagridview).

I'm using this code in DoubleClick event of Datagridview to get data from datagridview to combobox and another textbox and DateTimepicker:

private void mgrid_searchClient_Contrat_DoubleClick(object sender, EventArgs e)
{
    mcb_NomClient.Text= this.mgrid_searchClient_Contrat.CurrentRow.Cells[0].Value.ToString();
    mtb_NomContrat.Text = this.mgrid_searchClient_Contrat.CurrentRow.Cells[1].Value.ToString();
    mdtp_DATEECHIANCE.Text = this.mgrid_searchClient_Contrat.CurrentRow.Cells[2].Value.ToString();    
}

mcb_NomClient is a ComboBox , mtb_NomContrat is a TextBox, and mdtp_DATEECHIANCE is DateTimePicker.

Answer 1

If you want to show the double-clicked cell content to the ComboBox , you may use DataGridView.CurrentCell.Value , and ComboBox.Items.Add() as follows.

private void dataGridView1_DoubleClick(object sender, EventArgs e)
{
    var val = dataGridView1.CurrentCell.Value;
    comboBox1.Items.Add(val);
}

Doing so will only 'add' an item, but to show an item in the ComboBox you'll need to set the SelectedIndex as well.

To show the most-recently added item:

private void dataGridView1_DoubleClick(object sender, EventArgs e)
{
    var val = dataGridView1.CurrentCell.Value;
    comboBox1.Items.Add(val);
    comboBox1.SelectedIndex = comboBox1.Items.Count - 1;
}

To show the first item:

private void dataGridView1_DoubleClick(object sender, EventArgs e)
{
    var val = dataGridView1.CurrentCell.Value;
    comboBox1.Items.Add(val);
    comboBox1.SelectedIndex = 0;
}

---

EDIT (due to OP's updated requirements):

Let's say your DataGridView has 3 columns, namely, ID , Name , and City . And let us also say your ComboBox is populated with those Name values. And upon double-clicking a DataGridView row (any cell in a particular row), you want to display in the ComboBox the Name value that matches the double-clicked row's Name .

For example; DGV looks like this:

ID | Name | City

---

1 | Jane | New York

2 | Tom | Melbourne

3 | Chelsea | London

And your ComboBox has values Jane , Tom , and Chelsea . When you double click a row (any cell), you want to show that row's name. For instance, you double-click the cell London and you want the ComboBox to show Chelsea .

In that case you need to get the current row (clicked row), then get the Name column value in that row, and look it up in the ComboBox values.

private void dataGridView1_DoubleClick(object sender, EventArgs e)
{
    var currentRow = dataGridView1.CurrentRow;
    var selectedName = currentRow.Cells[1].Value;

    var index = comboBox1.Items.IndexOf(selectedName.ToString());
    comboBox1.SelectedIndex = index;
}