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 Topic  |
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GoodMorningSky
Junior Member
122 Posts |
 Posted - 19 August 2004 : 17:10:47
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Hi, all
My app create threads transfering data and display the status on the datagrid.
Most of time the number of threads are more than 100.
But, the exception comes out.. I put all try catch block. but, it is not catched since the exception occurs while painting datagrid i guess.
Exception:
Exception: from output window
MsgEach:170, PayrollReport: 327/725
********** Dead Thread:
MsgEach:165, PayrollReport: 511/780
MsgEach:166, PayrollReport: 512/672
MsgEach:165, PayrollReport: 512/780
MsgEach:166, PayrollReport: 513/672
MsgEach:170, PayrollReport: 328/725
at System.Data.DataColumnPropertyDescriptor.GetValue(Object component)
at System.Windows.Forms.DataGridColumnStyle.GetColumnValueAtRow(CurrencyManager source, Int32 rowNum)
at System.Windows.Forms.DataGridTextBoxColumn.Paint(Graphics g, Rectangle bounds, CurrencyManager source, Int32 rowNum, Brush backBrush, Brush foreBrush, Boolean alignToRight)
at System.Windows.Forms.DataGridRelationshipRow.PaintCellContents(Graphics g, Rectangle cellBounds, DataGridColumnStyle column, Brush backBr, Brush foreBrush, Boolean alignToRight)
at System.Windows.Forms.DataGridRow.PaintData(Graphics g, Rectangle bounds, Int32 firstVisibleColumn, Int32 columnCount, Boolean alignToRight)
at System.Windows.Forms.DataGridRelationshipRow.Paint(Graphics g, Rectangle bounds, Rectangle trueRowBounds, Int32 firstVisibleColumn, Int32 numVisibleColumns, Boolean alignToRight)
at System.Windows.Forms.DataGrid.PaintRows(Graphics g, Rectangle& boundingRect)
at System.Windows.Forms.DataGrid.PaintGrid(Graphics g, Rectangle gridBounds)
at System.Windows.Forms.DataGrid.OnPaint(PaintEventArgs pe)
at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer, Boolean disposeEventArgs)
at System.Windows.Forms.Control.WmPaint(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
at System.Windows.Forms.ComponentManager.System.Windows.Forms.UnsafeNativeMethods+IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
at System.Windows.Forms.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
at System.Windows.Forms.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(Form mainForm)
at TimeClockAdmin.frmMDIMain.Main() in c:\projects\new time clock release\new time clock hq\timeclockadmin\frmmdimain.cs:line 497
MsgEach:165, PayrollReport: 513/780
Object reference not set to an instance of an object.
MsgEach:166, PayrollReport: 514/672
MsgEach:170, PayrollReport: 329/725
this exception occurs from:
[STAThread]
static void Main()
{
try
{
if (SkyComponents.SkyWinUtils.PrevInstance())
{
MessageBox.Show ("Program is already running!");
return;
}
Application.Run(new frmMDIMain());
}
catch(Exception ex)
{
Debug.WriteLine("********** Dead Thread: " + Thread.CurrentThread.Name);
Debug.WriteLine(ex.StackTrace);
Debug.WriteLine(ex.Message); //here..
}
}
[/CODE]
Writing message method called by each thread..
private void MsgEach(int idx, string msg)
{
Debug.WriteLine("MsgEach:" + idx + ", " + msg);
try
{
deptList.Rows[idx]["Message"] = msg;
}
catch
{
Debug.WriteLine("MsgEach");
}
}
[/CODE]
This problem comes out since DataGrid painting is not thread safe..
Then what should I do?????
After the exception occurs the Application GUI disappears, but the task threads still work..
I think the GUI painting thread (in java AWTThread..) throw exception and die..
This problem doesn't occurs every time.. at the same moment..
Any idea to solve this problem????[/QUOTE]
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Software Engineer.
MCSD.NET, SCWCD |
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GoodMorningSky
Junior Member
122 Posts |
Posted - 19 August 2004 : 17:13:43
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This is very common problem.
Control is being painted by one thread!(in java it's called AWTThread).
If muti thread is running and show their result to a control, then the control throws exception while repainting...
The above question is about one of the problem.
How to synchronize it? Is any pattern doing this? |
Software Engineer.
MCSD.NET, SCWCD |
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pdrg
Support Moderator
United Kingdom
2897 Posts |
Posted - 20 August 2004 : 06:45:12
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Hi, not that I don't want to help, but you may get more mileage asking a C# forum somewhere (howabout asking on one of the excellent C# groups on usenet?)
I think you're more likely to get what you need.
hth |
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