[Mono-bugs] [Bug 331644] New: DataGridView virtual mode: abnormal memory allocation

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=331644

           Summary: DataGridView virtual mode: abnormal memory allocation
           Product: Mono: Class Libraries
           Version: 1.2
          Platform: x86
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Windows.Forms
        AssignedTo: mono-bugs at ximian.com
        ReportedBy: kobruleht2 at hot.ee
         QAContact: mono-bugs at ximian.com
          Found By: ---


Observed:

Allocated memory grows to huge amount.

Expected:

Grid should appear instantly like in .NET 2


Environment:

MONO 1.2.5  .NET 2 profile
Windows XP


Code to reproduce:

using System;
using System.Windows.Forms;
using System.Collections.Generic;

class test {
        [STAThreadAttribute()]
        public static void Main() {
                Application.Run(new VirtualModeForm());
        }
}

class VirtualModeForm : Form {
        private List<DataObject> m_Data = new List<DataObject>();
        private List<bool> m_Visited = new List<bool>();
        DataGridView m_Grid = new DataGridView();

        public VirtualModeForm() {
                Controls.Add(m_Grid);
                m_Grid.CellValueNeeded += OnCellValueNeeded;
                InitData();
                InitGrid();
        }

        private void InitData() {

                for (int i = 0; i < 1000001 + 1; i++) {

                        m_Visited.Add(false);
                        DataObject obj = new DataObject();
                        obj.Id = i;
                        obj.Val = 2 * i;
                        m_Data.Add(obj);
                }
        }

        private void InitGrid() {
                m_Grid.Dock = DockStyle.Fill;
#if true
                m_Grid.VirtualMode = true;
                m_Grid.ReadOnly = true;
                //m_Grid.AllowUserToAddRows = false;
                //m_Grid.AllowUserToDeleteRows = false;
                m_Grid.ColumnCount = 3;
                m_Grid.Rows.Add();
                m_Grid.Rows.AddCopies(0, 1000000 );
#else
                // Uncomment the next line and comment out the
                // the rest of the method to switch to data bound mode
                    m_Grid.DataSource = m_Data;
#endif
                }
        private void OnCellValueNeeded(object sender,
                 DataGridViewCellValueEventArgs e) {
                m_Visited[e.RowIndex] = true;
                if (e.ColumnIndex == 0) {

                        e.Value = m_Data[e.RowIndex].Id;
                }
                else if (e.ColumnIndex == 1) {
                        e.Value = m_Data[e.RowIndex].Val;
                }
                else if (e.ColumnIndex == 2) {
                        Random rand = new Random();
                        e.Value = rand.Next();
                }
        }
}

public class DataObject {

        private int m_Id;
        private int m_Val;

        public int Val {
                get { return m_Val; }
                set { m_Val = value; }
        }

        public int Id {
                get { return m_Id; }
                set { m_Id = value; }
        }
}


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