C# : "A first chance exception of type 'System.InvalidOperationException'"

Yanick Rochon picture Yanick Rochon · Dec 8, 2010 · Viewed 123.3k times · Source

Working on a class assignment in C#, I came across a program crash without any error (except what's written in VS2010's debug window). Here is the typical code causing the crash :

public partial class Test : Form
{
    public Test()
    {
        InitializeComponent();
    }

    private void Test_Load(object sender, EventArgs e)
    {
        ColumnHeader header;

        header = new ColumnHeader();
        header.Text = "#";
        header.TextAlign = HorizontalAlignment.Center;
        header.Width = 30;
        listView1.Columns.Add(header);

        TimerCallback tcb = this.UpdateListView;

        System.Threading.Timer updateTimer = new System.Threading.Timer(tcb, null, 0, 1000);
    }

    public void UpdateListView(object obj)
    {
        ListViewItem item;
        listView1.Items.Clear();

        for (int i = 0; i < 10; i++)
        {
            item = new ListViewItem(i.ToString());

            listView1.Items.Add(item);
        }

    }
}

... what am I missing here?

** EDIT **

There's no error, the program just ends like if I would call System.Environment.Exit(0);

A first chance exception of type 'System.InvalidOperationException' occurred in System.Windows.Forms.dll
The program '[4644] ProgramTest.vshost.exe: Managed (v4.0.30319)' has exited with code 0 (0x0).
The program '[4644] ProgramTest.vshost.exe: Program Trace' has exited with code 0 (0x0).

Answer

Mark Avenius picture Mark Avenius · Dec 8, 2010

If you check Thrown for Common Language Runtime Exception in the break when an exception window (Ctrl+Alt+E in Visual Studio), then the execution should break while you are debugging when the exception is thrown.

This will probably give you some insight into what is going on.

Example of the exceptions window