[Gtk-sharp-list] How to display data from a SQLite database into a GTK# TreeView?

NPcomplete kzvezdarov at gmail.com
Thu Apr 28 19:17:25 EDT 2011

I need to display the datatable of a sqlite database in a simple grid view,
much like in WindowsForms'/WPF's datagridview, but with GTK#. I have been
trying to configure the GTK.TreeView to display the data properly, but with
no luck. The data is not displayed and I get an obscure error in the
Application output. I find it extremely strange that there is no
documentation on the subject. 
I followed the example given here:
http://www.mono-project.com/GtkSharp_TreeView_Tutorial. First I create the
model (ListStore) by initializing it with the string type for the data of
every column. Then I append the columns of the data table to the tree view.
Then I engage the sqlite reader, and for every entry I add its data to the
model. Then I add a cell for each column pointing to the data. Finally, I
give the tree view its model.

However, this only manages to display the columns with no data. What I get
in the application output is this:
Gtk-CRITICAL **: gtk_tree_view_column_cell_layout_set_cell_data_func:
assertion `info != NULL' failed

Here is my code:

public void SetupUsers(Gtk.TreeView table)
		        Type[] types;			
			SqliteCommand cmd = new SqliteCommand("SELECT * FROM "+Tables.USERS,
			SqliteDataReader reader = cmd.ExecuteReader();
			types = new Type[reader.FieldCount];			
			for(int i = 0; i < types.Length; i++)
				types[i] = typeof(string);
			Gtk.ListStore list = new Gtk.ListStore(types);
			for(int i = 0; i < TblExaminees.SCHEMA.Length; i++)
				table.AppendColumn(TblUsers.SCHEMA[i], new Gtk.CellRendererText(),
				String[] rowData = new String[TblUsers.SCHEMA.Length];
				for(int index = 0; index < TblUsers.SCHEMA.Length; index++)
					rowData[index] = reader.GetString(index);					
					table.Columns[index].SetCellDataFunc(new Gtk.CellRendererText(), new
			table.Model = list;
		protected void renderUser(Gtk.TreeViewColumn column, Gtk.CellRenderer
cell, Gtk.TreeModel model, Gtk.TreeIter iter)
			Console.WriteLine("got here");
			(cell as Gtk.CellRendererText).Text = (string)model.GetValue(iter,
Array.FindIndex(TblUsers.SCHEMA, item => item == column.Title ));
I appreciate your help. 

P.S. I have tried to use table.Columns[index].AddAttribute(new
Gtk.CellRendererText(), "text", index); instead of setting the data func,
which just returns this similar error: Gtk-CRITICAL **:
gtk_tree_view_column_cell_layout_add_attribute: assertion `info != NULL'

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