检查文本框是否等于数据网格视图列中的任何值

Question

I want to check if the value of my textbox ( apTB ) at the time of a button press equals any value currently in a certain column ( column 0 ( alphapapa )) in my data grid view ( apDGV ).

Current Code:

private void APButton_Click(object sender, EventArgs e)
        {
            if (apTB.Text == apDGV.Columns[0])
            {
                MessageBox.Show("Duplicate.", "Duplicate", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
            else
            {
                stuff....
            }

But it is of course not working.

Answer 1

If you want to check every value in column, you must iterate through every row in column. Additionally, it is good practice to write column names instead of numbers.

    private void Button1_Click(object sender, EventArgs e)
    {
        foreach (DataGridViewRow row in dataGridView1.Rows) {
            if (textBox2.Text == row.Cells["columnName"].Value.ToString())
            {
                MessageBox.Show("Duplicate.", "Duplicate", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
        }
    }

Answer 2

apDGV.Columns[0] is a DataGridViewColumn object.

To check the value of cells, adress them eg like this:

apDGV.Rows[0].Cells[0].Value

Just iterate with a loop over all the cells in your column and compare the values.