C#

Daniel Grunwald wrote:

- existingItems or itemsToAdd is accessed from multiple threads and the item count changes during the insertion.

Daniel Grunwald wrote:

- itemsToAdd implements the ICollection<t> interface incorrectly. What type is itemsToAdd?

Greeeg wrote:

No threads involved (at least none that I know of). However, itemsTooAdd is modified by a different event callback which I have no access to.

Daniel Grunwald wrote:

I'm pretty sure that the event runs on a separate thread or uses the thread pool.

TID Normal: 1
TID Event: 16

Guffa wrote:

You can't lock an object, you can only lock code blocks.

ghaneie wrote:

how to do made(draw) 3D(three dimension)plot ?

public partial class MainForm : Form {
private static MainForm _theForm;

private MainForm() {
   InitializeComponent();
   _theForm = this;
}
public static MainForm Instance {
   get {
      if (_theForm == null) {
         _theForm = new MainForm();
      }
      return _theForm;
   }
}
...

Application.Run(MainForm.Instance);

System.Windows.Forms.MessageBox.Show(MainForm.Instance.Height.TowString());

//FormParent
using System;
using System.Drawing;
using System.Windows.Forms;

public partial class FormParent : Form
{
    private ListBox listBox1;
    private Button button1;
    public FormParent()
    {
        InitializeComponent();
        Width = 430;
        listBox1 = new ListBox();
        listBox1.Location = new Point(12, 12);
        listBox1.Size = new Size(400, 200);
        Controls.Add(listBox1);
        button1 = new Button();
        button1.Click += new EventHandler(button1_Click);
        button1.Location = new Point(12, 224);
        button1.Text = "Open &Child";
        Controls.Add(button1);
    }
    void button1_Click(object sender, EventArgs e)
    {
        FormChild child = new FormChild();
        child.StatusUpdate += new EventHandler<StatusEventArgs>(child_StatusUpdate);
        child.Show();
    }
    void child_StatusUpdate(object sender, StatusEventArgs e)
    {
        listBox1.Items.Add(sender.ToString() + ": " + e.Message);
    }
}

//FormChild
using System;
using System.Drawing;
using System.Windows.Forms;

public partial class FormChild : Form
{
    public event EventHandler<StatusEventArgs> StatusUpdate;
    private Button button1;
    public FormChild()
    {
        InitializeComponent();
        button1 = new Button();
        button1.Click += new EventHandler(button1_Click);
        button1.Location = new Point(12, 12);
        button1.Width = 100;
        button1.Text = "Open &Grandchild";
        Controls.Add(button1);
    }
    void button1_Click(object sender, EventArgs e)
    {
        FormGrandChild grandchild = new FormGrandChild();
        grandchild.StatusUpdate += new EventHandler<StatusEventArgs>(grandchild_StatusUpdate);
        grandchild.Show();
        OnStatusUpdate(this, new StatusEventArgs("Grandchild created"));
    }
    void grandchild_StatusUpdate(object sender, StatusEventArgs e)
    {
        OnStatusUpdate(sender, e);
    }
    //Using the sender in a parameter here  so the originating object can be passed instead of this.
    protected virtual void OnStatusUpdate(object sender, StatusEventArgs e)
    {
        EventHandler<StatusEventArgs> eh = StatusUpdate;
        if (eh != null)
            eh(sender, e);
    }
}

//FormGrandChild
using System;
using System.Drawing;
using System.Windows.Forms;

public partial class FormGrandChild : Form
{
    public event EventHandler<StatusEventArgs> StatusUpdate;
    private Button button1;
    public FormGrandChild()
    {
        InitializeComponent();
        button1 = new Button();
        button1.Click += new EventHandler(button1_Click);
        button1.Location = new Point(12, 12);
        button1.Width = 100;
        button1.Text = "&Send Status";
        Controls.Add(button1);
    }
    void button1_Click(object sender, EventArgs e)
    {
        OnStatusUpdate(new StatusEventArgs("Button Clicked"));
    }
    protected virtual void OnStatusUpdate(StatusEventArgs e)
    {
        EventHandler<StatusEventArgs> eh = StatusUpdate;
        if (eh != null)
            eh(this, e);
    }
}

//StatusEventArgs
using System;

public class StatusEventArgs : EventArgs
{
    private string m_Message;

    public StatusEventArgs(string message)
    {
        m_Message = message;
    }
    public string Message
    {
        get { return m_Message; }
    }
}