如何获取datagridview组合框列的选定值？

Question

I have a combox with list of image labels and a save button. On the save button I need to get the combox selected value on the save button if it is null then validate. How I can do this?

enter image description here

This is how I add combox in datagridview:

string[] ImageLabels = {Photograph, PassportPage1, PassportPage2, 
PassportPage3, PassportPage4};
var list=new ArrayList();
var combo = new DataGridViewComboBoxColumn();
combo.HeaderText = "Image Labels";
combo.Name = "combo";
list = new ArrayList();
list.AddRange(ImageLabels);
combo.Items.AddRange(list.ToArray());
dgvFiles.Columns.Add(combo);

I am getting null values.

enter image description here

Answer 1

Add the below event for your datagridview

Here my datagridview name is dataGridView1

private void dataGridView1_CurrentCellDirtyStateChanged(object sender, EventArgs e)
{
    dataGridView1.CommitEdit(DataGridViewDataErrorContexts.Commit);
}

private void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
    string comboboxSelectedValue = string.Empty;

    if (dataGridView1.Columns[e.ColumnIndex].GetType() == typeof(DataGridViewComboBoxColumn))
        comboboxSelectedValue = dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString();
}

1) dataGridView1_CurrentCellDirtyStateChanged: This event will fire your dataGridView1_CellValueChanged immediately after you select value from your DataGridViewComboBoxColumn .

2) dataGridView1_CellValueChanged: This event will give you the value of your selected option in combobx, we additionally checked that is this the values comes from DataGridViewComboBoxColumn or not.

You may add above events on Form1_Load like

private void Form1_Load(object sender, EventArgs e)
{
    dataGridView1.CellValueChanged +=
             new DataGridViewCellEventHandler(dataGridView1_CellValueChanged);
    dataGridView1.CurrentCellDirtyStateChanged +=
                 new EventHandler(dataGridView1_CurrentCellDirtyStateChanged);
}

Output: