以另一种形式从datagridview获取所选记录的pk

Question

When I perform the getPkRowReport() it works correctly if I am using the value on the same form (form1). If I need the pk for Form 2 it always defaults to the top row and never the row i had selected before I launch form 2. If I look at form 1 after I launch form 2 the correct row is selected but I am still getting the pk for the top record. Any help would be appreciated.

Form 1:

    private int pkFromReport;
    public int PkFromReport
    {
        get
        {
            pkFromReport = getPkRowReport();
            return pkFromReport;
        }
    } 

    private int getPkRowReport()
    {
        if (dgvReportGrid.CurrentRow != null)
        {
            //get selected row index
            int index = this.dgvReportGrid.CurrentRow.Index;
            //get pk of selected row using index
            string cellValue = dgvReportGrid["rptNo", index].Value.ToString();
            //change pk string to int
            int pKey = Int32.Parse(cellValue);

            return pKey;
        }
        else
        {
            return -1;
        }
    }

Form 2:

private frmMain mainForm = new frmMain();

private void button1_Click(object sender, EventArgs e)
    {
        textBox1.Text = mainForm.PkFromReport.ToString();
    }

Answer 1

CurrentRow gets the row containing the current cell. When your form loses focus, your selected row is no longer the current row.

You should use the SelectedRows collection to get your currently selected row. Since you plan to have only one selected row, change your code like this:

private int getPkRowReport()
{
    if (dgvReportGrid.SelectedRows.Count > 0)
    {
        //get selected row index
        int index = this.dgvReportGrid.SelectedRows[0].Index;
        //get pk of selected row using index
        string cellValue = dgvReportGrid["rptNo", index].Value.ToString();
        //change pk string to int
        int pKey = Int32.Parse(cellValue);

        return pKey;
    }
    else
    {
        return -1;
    }
}