Question

Edit: The line of code that gives the exception is “foreach (Column column in table.Columns)
” and that’s because the Table table object is null. How would I load a Table object? My code seemed to be the right approach but it doesn’t work as expected. 😀

I’m pulling a list of all columns in a given SQL table, and then loading them to a listbox. Here is the code:

public Dictionary<string,string> FindColumns(string tableName)
{
    using (var mySqlConnection = new SqlConnection(Properties.Settings.Default.ConnectionString))
    {
        var myConnection = new ServerConnection(mySqlConnection);
        var myServer = new Server(myConnection);
        var myDatabase = myServer.Databases["Shipments"];

        //Using a breakpoint I figured out that table is remaining null. That's
        //why I'm getting this error. How can I pull a table then?
        Table table = myDatabase.Tables[tableName];

        foreach (Column column in table.Columns)
        {
            Columns.Add(column.Name, column.DataType.ToString());
        }
    }

    return Columns;
}

I’m getting the error on the above foreach loop.

And here is where I invoke the method:

private void lstTableNames_SelectedIndexChanged(object sender, EventArgs e)
{
    foreach (var column in db.FindColumns("Shipments"))
    {
        lstTableColumns.Items.Add(column.Key + "--" + column.Value);
    }
}

Thanks for the help!

Answer 1

Using the debugger, find out what’s in myDatabase.Tables. Does it have any values? If so, what are they? Does it contain one for “tableName”?