Question

I have a win form which has a ListBox. I want to create dynamically a DataTable (till now I only declared some columns – you can see in the code – that I later want to use to link the DataTable to an existing empty DataBase) but don’t know how to link it to the Listbox in order to “take” the 4 elements from it: event_time , event_filename , event_name , event_fullpath. Pls Help,

Part of my code till now is:

    private delegate void AppendListHandler(string event_filename, String event_name, String event_fullpath);

    private void AppendText(string event_filename, String event_name, String event_fullpath)
    {
        if (lstResultLog.InvokeRequired)
            lstResultLog.Invoke(new AppendListHandler(AppendText), new object[] { event_filename, event_name, event_fullpath });
        else
        {
            DateTime event_time = DateTime.Now;
            //String event_duration = event_time.ToString("HH:mm");
            lstResultLog.Items.Add(event_time + event_filename + event_name + event_fullpath);
        }

        DataTable table = new DataTable("tbl_Event");
        table.Columns.Add("event_duration");
        table.Columns.Add("event_name");
        table.Columns.Add("event_filename");
        table.Columns.Add("event_fullpath");
        table = (DataTable)lstResultLog.DataSource;
    }

lstResultLog is the name of the ListBox, all the fields from the ListBox have the exact name as in the declared DataTable, and as the DataBase.

Answer 1

You can have in your form a field of type DataTable that will hold the data you want. Then, whenever you add an item to your listbox, add a row to the data table with same data:

public class YourForm
{
    private DataTable _table;
    public YourForm()
    {
        InitializeComponents();
        _table = BuildDataTable();
    }

    private DataTable BuildDataTable()
    {
        DataTable table = new DataTable("tbl_Event");
        table.Columns.Add("event_duration");
        table.Columns.Add("event_name");
        table.Columns.Add("event_filename");
        table.Columns.Add("event_fullpath");
        return table;
    }

    private void AppendText(string event_filename, String event_name, String event_fullpath)
    {
        if (lstResultLog.InvokeRequired)
            lstResultLog.Invoke(new AppendListHandler(AppendText), new object[] { event_filename, event_name, event_fullpath });
        else
        {
            DateTime event_time = DateTime.Now;
            lstResultLog.Items.Add(event_time + event_filename + event_name + event_fullpath);
            //Create new row
            var row = _table.NewRow();
            // Fill row values
            row["event_name"] = event_name;
            // Add row to table
            _table.Rows.Add(row);
        }
    }
}

And when you need to send the data to database, just send _table field as a parameter to the method that saves data.