C# – Textbox Autocomplete in a DataGridView Winform

cdatagridviewnetwinforms

I've got my DataGridView binding correctly to my datatable however I'm trying to get autocomplete to work correctly for one of the textbox columns. The autocomplete is working but I'm trying to restrict it to only one column on the datagridview. At the moment it either does it for every column, or nothing at all. Any ideas? Code below.

private void dataGridDetail_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
    {
        if (dataGridDetail.CurrentCell.ColumnIndex == 2)
        {
            var source = new AutoCompleteStringCollection();
            String[] stringArray = Array.ConvertAll<DataRow, String>(products.Select(), delegate(DataRow row) { return (String)row["code"]; });
            source.AddRange(stringArray);

            TextBox prodCode = e.Control as TextBox;
            if (prodCode != null)
            {
                prodCode.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
                prodCode.AutoCompleteCustomSource = source;
                prodCode.AutoCompleteSource = AutoCompleteSource.CustomSource;

            }
        }
    }

Best Answer

try to release the prodCode.AutoCompleteCustomSource, if it is not the correct column:

private void dataGridDetail_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
    if (dataGridDetail.CurrentCell.ColumnIndex == 2)
    {
        var source = new AutoCompleteStringCollection();
        String[] stringArray = Array.ConvertAll<DataRow, String>(products.Select(), delegate(DataRow row) { return (String)row["code"]; });
        source.AddRange(stringArray);

        TextBox prodCode = e.Control as TextBox;
        if (prodCode != null)
        {
            prodCode.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
            prodCode.AutoCompleteCustomSource = source;
            prodCode.AutoCompleteSource = AutoCompleteSource.CustomSource;

        }
    }else
          prodCode.AutoCompleteCustomSource = null;
}

Related Solutions

C# – How to make a textbox that only accepts numbers

Two options:

Use a NumericUpDown instead. NumericUpDown does the filtering for you, which is nice. Of course it also gives your users the ability to hit the up and down arrows on the keyboard to increment and decrement the current value.

Handle the appropriate keyboard events to prevent anything but numeric input. I've had success with this two event handlers on a standard TextBox:

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
    if (!char.IsControl(e.KeyChar) && !char.IsDigit(e.KeyChar) &&
        (e.KeyChar != '.'))
    {
            e.Handled = true;
    }

    // only allow one decimal point
    if ((e.KeyChar == '.') && ((sender as TextBox).Text.IndexOf('.') > -1))
    {
        e.Handled = true;
    }
}

You can remove the check for '.' (and the subsequent check for more than one '.') if your TextBox shouldn't allow decimal places. You could also add a check for '-' if your TextBox should allow negative values.

If you want to limit the user for number of digit, use: textBox1.MaxLength = 2; // this will allow the user to enter only 2 digits

C# – How to create different cell formats in Winform DataGridView

You can provide a handler for the DataGridView's CellFormatting event, such as:

public partial class Form1 : Form
{
    DataGridViewCellStyle _myStyle = new DataGridViewCellStyle();

    public Form1()
    {
        InitializeComponent();

        _myStyle.BackColor = Color.Pink;
        // We could also provide a custom format string here 
        // with the _myStyle.Format property
    }

    private void dataGridView1_CellFormatting(object sender, 
        DataGridViewCellFormattingEventArgs e)
    {
        // Every five rows I want my custom format instead of the default
        if (e.RowIndex % 5 == 0)
        {
            e.CellStyle = _myStyle;
            e.FormattingApplied = true;
        }
    }

    //...
}

For assistance on creating your own styles, refer to the DataGridView.CellFormatting Event topic in the online help.

Best Answer

Related Solutions

C# – How to make a textbox that only accepts numbers

C# – How to create different cell formats in Winform DataGridView

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