在 C# Winforms 中同时自动完成两个文本框

Question

I am in need of a push in the right direction. I have a form which has 2 texboxes - one which has the Autocomplete functionality enabled and gets the data from a DataReader (txtBx1), and the other (txtBx2) which I am trying to complete using the value of txtBx1.

So, when I start typing into txtBx1, the autocomplete works as expected, but what I want is for txtBx2 to be populated at the same time with data from second column of the query used to retrieve the data.

For instance, in txtBx1, I am typing in a Module Reference number, so I want the Module Name to be populated in txtBx2 whilst the automplete in txtBx1 is 'taking place' or once it 'completes'. So far what I have is;

 private void Form2_Load(object sender, EventArgs e)
        {

            OracleConnection oraCon = new OracleConnection("Data Source=(DESCRIPTION="
                             + "(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=xxxxxxxx)(PORT=1521)))"
                             + "(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME = TBL)));"
                              + "User Id=username;Password=password;");
            oraCon.Open();


            OracleCommand ocmodref = new OracleCommand(" SELECT module.reference as ModuleRef, module.name as ModuleName FROM TBL_Module module ", oraCon);
          //OracleCommand ocmodname = new OracleCommand(" SELECT module.name as ModuleName FROM TBL_Module module where module.reference = '" + txtBx1.Text + "' ", oraCon);


            OracleDataReader DRModRef = ocmodref.ExecuteReader();
            //OracleDataReader DRModName = ocmodname.ExecuteReader();

            AutoCompleteStringCollection automodreftext = new AutoCompleteStringCollection();
            //AutoCompleteStringCollection automodnametext = new AutoCompleteStringCollection();

            while (DRModRef.Read() )
            {
               
                automodreftext.Add(DRModRef.GetString(0));
                automodreftext.Add(DRModRef.GetString(1));
                //automodnametext.Add(DRModName.GetString(0));
            }
            
            txtBx1.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
            txtBx1.AutoCompleteSource = AutoCompleteSource.CustomSource;
            txtBx1.AutoCompleteCustomSource = automodreftext;

            txtBx2.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
            txtBx2.AutoCompleteSource = AutoCompleteSource.CustomSource;
            txtBx2.AutoCompleteCustomSource = automodreftext;

            oraCon.Close();
        }

I have commented out the bits I tried earlier which didn't work but I have left them in there just in case you spot something I missed. Also, I have tried triggering the TextChanged event for txtBx1 so that when the text changes as the user searches for a Module Reference, this autocompletes txtBx2 with the name, but alas, no joy!

I'd be more than grateful if you could steer me in the right path.

Best Regards,

Answer 1

To display the matching Name to the selected Ref# and vise-versa Utilize TextChanged events as so:

private void txtBx1_TextChanged(object sender, EventArgs e)
{
    TextBox tb = (TextBox)sender;
    StringCollection customSource = tb.AutoCompleteCustomSource;
    int index = customSource.IndexOf(tb.Text);

    if (index >= 0)
    {
        txtBx2.Text = txtBx2.AutoCompleteCustomSource[index];
    }
    else
    {
        txtBx2.Text = tb.Text;
    }
}

private void txtBx2_TextChanged(object sender, EventArgs e)
{
    TextBox tb = (TextBox)sender;
    StringCollection customSource = tb.AutoCompleteCustomSource;
    int index = customSource.IndexOf(tb.Text);

    if (index >= 0)
    {
        txtBx1.Text = txtBx1.AutoCompleteCustomSource[index];
    }
    else
    {
        txtBx1.Text = tb.Text;
    }
}

just make sure you set txtBx2.AutoCompleteCustomSource = automodnametext and apply AutoComplete transform of your desire to the raw string.

The expected behavior would copy the text between the two textboxes whenever typing into only one; and upon selecting/typing a matching string, the other textbox would also show the desired target string (if transformation is applied).