Conditionally Active Datagridview ComboBox

Mehmet Fatih

3y775C#

I want only the comboBoxes that are in front of the checked checkboxes to be active and the others to be passive. My codes are those. How can I integrate these codes?

private void button1_Click(object sender, EventArgs e)
{
    int i = 0;
    List ChkedRow = new List();
    if (dataGridView1.Rows.Count > 0)
        for (i = 0; i <= dataGridView1.RowCount - 1; i++)
        {
            if (Convert.ToBoolean(dataGridView1.Rows[i].Cells["pid"].Value) == true)
            {
                ChkedRow.Add(i);
            }
        }
    if (ChkedRow.Count == 0)
    {
        MessageBox.Show("Geziye katilacak personel seçimi yapilmadi. Geziye gidecek personeli seçmek için en bastaki kutucuklari isaretleyiniz!");
        return;
    }
    DataGridViewComboBoxColumn comboBoxColumn = dataGridView1.Columns["kbaskani"] as DataGridViewComboBoxColumn;
    if (comboBoxColumn != null)
    {
        int yesCount = 0;
        int rowIndexWithMultipleYes = -1;
        //Evet sayisini hesaplama ve birden fazla eveti hafizaya alma
        for (int rowIndex = 0; rowIndex < dataGridView1.Rows.Count; rowIndex++)
        {
            DataGridViewRow row = dataGridView1.Rows[rowIndex];
            string cellValue = row.Cells[comboBoxColumn.Index].Value?.ToString();
            if (cellValue == "Evet")
            {
                yesCount++;
                if (yesCount > 1)
                {
                    rowIndexWithMultipleYes = rowIndex;
                    break;
                }
            }
        }
        //Evet sayimina dayali sonuç gösterme
        if (yesCount == 0)
        {
            MessageBox.Show("Kafile baskani seçmediniz. Bir kisi kafile baskani olarak seçilmelidir.", "UYARI", MessageBoxButtons.OK, MessageBoxIcon.Error);
            return;
        }
        else if (yesCount > 1)
        {
            MessageBox.Show("Birden fazla kafile baskani seçtiniz. Yalnizca bir kisi kafile baskani olarak seçilmelidir.", "UYARI", MessageBoxButtons.OK, MessageBoxIcon.Error);
            return;
        }
        else if (rowIndexWithMultipleYes != -1)
        {
            //1'den fazla kisi seçimi durumunda yapilacak uyari
            for (int rowIndex = 0; rowIndex < dataGridView1.Rows.Count; rowIndex++)
            {
                if (rowIndex != rowIndexWithMultipleYes)
                {
                    dataGridView1.Rows[rowIndex].Cells[comboBoxColumn.Index].Value = "Hayir";
                }
            }
        }
    }
}

2 Replies

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Mehmet Fatih3y ago
Thanks CR Bhargavi. I have solved the problem with the following codes.

private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
{
object value = dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value;
if (value != null && value.ToString() != string.Empty)
{

DataGridViewRow row = dataGridView1.Rows[e.RowIndex];
if (Convert.ToBoolean(row.Cells[pid.Name].Value) == false)
{
MessageBox.Show("Öncelikle geziye katilacak kisi seçilmelidir.");
}
}
}

private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
object value = dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value;
if (value != null && value.ToString() != string.Empty)
{
dataGridView1.Rows[e.RowIndex].Cells[1].ReadOnly = true;
}
else
{
dataGridView1.Rows[e.RowIndex].Cells[1].ReadOnly = false;
}
}
Cr Bhargavi3y ago
To highlight your Message box and others as passive, you should do these following, Add a CheckBox column to your `dataGridView1` to represent the selection status for each row. Attach an event handler to the CheckBox column to capture the check/uncheck events. In the event handler, enable or disable the corresponding ComboBox based on the checkbox status.

Here's how you can modify your code to achieve this:

Assuming the name of the CheckBox column is "cbxSelect" and the name of the DataGridViewComboBoxColumn is "kbaskani":

1. Add a CheckBox column to your `dataGridView1`. This can be done either programmatically or through the designer.

2. Attach an event handler to the CheckBox column to capture the check/uncheck events. In this example, let's name the event handler `cbxSelect_CheckedChanged`.

3. In the `cbxSelect_CheckedChanged` event handler, enable or disable the corresponding ComboBox based on the checkbox status.

Here's the modified code:

private void cbxSelect_CheckedChanged(object sender, EventArgs e)
{
CheckBox checkBox = (CheckBox)sender;

// Get the current row index where the CheckBox is located
int rowIndex = dataGridView1.CurrentCell.RowIndex;

// Enable or disable the ComboBox based on the CheckBox status
if (checkBox.Checked)
{
dataGridView1.Rows[rowIndex].Cells["kbaskani"].ReadOnly = false;
}
else
{
dataGridView1.Rows[rowIndex].Cells["kbaskani"].ReadOnly = true;
}
}

private void button1_Click(object sender, EventArgs e)
{
// Your existing code for button1_Click remains unchanged
// ...
}

Make sure to update the event handler assignment in your code when you add the CheckBox column to your `dataGridView1`. You can do this in the form's constructor or the Load event handler:

private void YourForm_Load(object sender, EventArgs e)
{
// Attach the event handler to the CheckBox column
DataGridViewCheckBoxColumn checkBoxColumn = (DataGridViewCheckBoxColumn)dataGridView1.Columns["cbxSelect"];
checkBoxColumn.CellValueChanged += cbxSelect_CheckedChanged;
}

With these modifications, the ComboBoxes will be enabled only for the rows where the corresponding CheckBox is checked, and they will be disabled for unchecked rows.