Hello,
I'm using a windows form in which there is a standard ListBox control. I
want to add/remove objects from the ArrayList associated to the ListBox, and
I want the ListBox immediately shows graphically the change: e.g. if I
remove an element from the ArrayList object, then that element should not be
no more displayed in the list box.
Actually i'm using this code below:
private void UpdateListBox (KActivationList p_aL)
{
this.m_activation.DataSource = null;
this.m_activation.DataSource = p_aL;
this.m_activation.ValueMember = "VerboseName";
this.m_activation.DisplayMember = "VerboseName";
m_activation.Invalidate ();
}
The UpdateListBox method is called whenever an item has been removed/added
to a KActivationList object, which is a derived class of ArrayList.
m_activation is the ListBox. In this way it seems to work. But I'm getting
*sometimes* this exception when I select with the mouse an item in the list
box after having deleted any item:
Exception not managed: System.ArgumentOutOfRangeException: Index out of
bounds. the value must be non negative or less than the set length..
Parameter name: index
at System.Collections.ArrayList.get_Item(Int32 index)
at System.Windows.Forms.CurrencyManager.EndCurrentEdi t()
at System.Windows.Forms.CurrencyManager.ChangeRecordS tate(Int32
newPosition, Boolean validating, Boolean endCurrentEdit, Boolean
firePositionChange, Boolean pullData)
at System.Windows.Forms.CurrencyManager.set_Position( Int32 value)
at System.Windows.Forms.ListBox.OnSelectedIndexChange d(EventArgs e)
at System.Windows.Forms.ListBox.WmReflectCommand(Mess age& m)
at System.Windows.Forms.ListBox.WndProc(Message& m)
at System.Windows.Forms.ControlNativeWindow.OnMessage (Message& m)
at System.Windows.Forms.ControlNativeWindow.WndProc(M essage& m)
at System.Windows.Forms.NativeWindow.DebuggableCallba ck(IntPtr hWnd,
Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.SendMessa ge(HandleRef hWnd,
Int32 msg, IntPtr wParam, IntPtr lParam)
at System.Windows.Forms.Control.SendMessage(Int32 msg, IntPtr wparam,
IntPtr lparam)
at System.Windows.Forms.Control.ReflectMessageInterna l(IntPtr hWnd,
Message& m)
at System.Windows.Forms.Control.WmCommand(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Mes sage& m)
at System.Windows.Forms.ContainerControl.WndProc(Mess age& m)
at System.Windows.Forms.ParkingWindow.WndProc(Message & m)
at System.Windows.Forms.ControlNativeWindow.OnMessage (Message& m)
at System.Windows.Forms.ControlNativeWindow.WndProc(M essage& m)
at System.Windows.Forms.NativeWindow.DebuggableCallba ck(IntPtr hWnd,
Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.CallWindo wProc(IntPtr
wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at System.Windows.Forms.NativeWindow.DefWndProc(Messa ge& m)
at System.Windows.Forms.Control.DefWndProc(Message& m)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons
button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ListBox.WndProc(Message& m)
at System.Windows.Forms.ControlNativeWindow.OnMessage (Message& m)
at System.Windows.Forms.ControlNativeWindow.WndProc(M essage& m)
at System.Windows.Forms.NativeWindow.DebuggableCallba ck(IntPtr hWnd,
Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchM essageW(MSG& msg)
at
System.Windows.Forms.ComponentManager.System.Windo ws.Forms.UnsafeNativeMetho
ds+IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason,
Int32 pvLoopData)
at System.Windows.Forms.ThreadContext.RunMessageLoopI nner(Int32 reason,
ApplicationContext context)
at System.Windows.Forms.ThreadContext.RunMessageLoop( Int32 reason,
ApplicationContext context)
at System.Windows.Forms.Application.RunDialog(Form form)
at System.Windows.Forms.Form.ShowDialog(IWin32Window owner)
at TrainGroundStation.Form1.menuItem6_Click(Object sender, EventArgs e)
in c:\luca_tt\vcproj\traingroundstation\groundstation train.cs:line 366
at System.Windows.Forms.MenuItem.OnClick(EventArgs e)
at System.Windows.Forms.MenuItemData.Execute()
at System.Windows.Forms.Command.Invoke()
at System.Windows.Forms.Command.DispatchID(Int32 id)
at System.Windows.Forms.Control.WmCommand(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Mes sage& m)
at System.Windows.Forms.ContainerControl.WndProc(Mess age& m)
at System.Windows.Forms.Form.WndProc(Message& m)
at System.Windows.Forms.ControlNativeWindow.OnMessage (Message& m)
at System.Windows.Forms.ControlNativeWindow.WndProc(M essage& m)
at System.Windows.Forms.NativeWindow.DebuggableCallba ck(IntPtr hWnd,
Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchM essageW(MSGIl
programma "[1476] TrainGroundStation.exe" è terminato con il codice 0 (0x0).
& msg)
at
System.Windows.Forms.ComponentManager.System.Windo ws.Forms.UnsafeNativeMetho
ds+IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason,
Int32 pvLoopData)
at System.Windows.Forms.ThreadContext.RunMessageLoopI nner(Int32 reason,
ApplicationContext context)
at System.Windows.Forms.ThreadContext.RunMessageLoop( Int32 reason,
ApplicationContext context)
at System.Windows.Forms.Application.Run(Form mainForm)
at TrainGroundStation.Form1.Main() in
c:\luca_tt\vcproj\traingroundstation\groundstation train.cs:line 524
Any help?
Greetings,
Luca
2  3411 
Try setting this.m_activation.SelectedIndex = 0 at the start of your
UpdateListBox. This will make sure the selected index is valid (unless the
list is empty) when the new list is being displayed for the first time.
======================
Clay Burch, .NET MVP
Visit www.syncfusion.com for the coolest tools
"Luca" <lu**@rewind.com> wrote in message
news:ua**************@tk2msftngp13.phx.gbl... Hello,
I'm using a windows form in which there is a standard ListBox control. I
want to add/remove objects from the ArrayList associated to the ListBox,
and I want the ListBox immediately shows graphically the change: e.g. if I
remove an element from the ArrayList object, then that element should not
be no more displayed in the list box.
Actually i'm using this code below:
private void UpdateListBox (KActivationList p_aL)
{
this.m_activation.DataSource = null;
this.m_activation.DataSource = p_aL;
this.m_activation.ValueMember = "VerboseName";
this.m_activation.DisplayMember = "VerboseName";
m_activation.Invalidate ();
}
The UpdateListBox method is called whenever an item has been removed/added
to a KActivationList object, which is a derived class of ArrayList.
m_activation is the ListBox. In this way it seems to work. But I'm getting
*sometimes* this exception when I select with the mouse an item in the
list box after having deleted any item:
Exception not managed: System.ArgumentOutOfRangeException: Index out of
bounds. the value must be non negative or less than the set length..
Parameter name: index
at System.Collections.ArrayList.get_Item(Int32 index)
at System.Windows.Forms.CurrencyManager.EndCurrentEdi t()
at System.Windows.Forms.CurrencyManager.ChangeRecordS tate(Int32
newPosition, Boolean validating, Boolean endCurrentEdit, Boolean
firePositionChange, Boolean pullData)
at System.Windows.Forms.CurrencyManager.set_Position( Int32 value)
at System.Windows.Forms.ListBox.OnSelectedIndexChange d(EventArgs e)
at System.Windows.Forms.ListBox.WmReflectCommand(Mess age& m)
at System.Windows.Forms.ListBox.WndProc(Message& m)
at System.Windows.Forms.ControlNativeWindow.OnMessage (Message& m)
at System.Windows.Forms.ControlNativeWindow.WndProc(M essage& m)
at System.Windows.Forms.NativeWindow.DebuggableCallba ck(IntPtr hWnd,
Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.SendMessa ge(HandleRef hWnd,
Int32 msg, IntPtr wParam, IntPtr lParam)
at System.Windows.Forms.Control.SendMessage(Int32 msg, IntPtr wparam,
IntPtr lparam)
at System.Windows.Forms.Control.ReflectMessageInterna l(IntPtr hWnd,
Message& m)
at System.Windows.Forms.Control.WmCommand(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Mes sage& m)
at System.Windows.Forms.ContainerControl.WndProc(Mess age& m)
at System.Windows.Forms.ParkingWindow.WndProc(Message & m)
at System.Windows.Forms.ControlNativeWindow.OnMessage (Message& m)
at System.Windows.Forms.ControlNativeWindow.WndProc(M essage& m)
at System.Windows.Forms.NativeWindow.DebuggableCallba ck(IntPtr hWnd,
Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.CallWindo wProc(IntPtr
wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at System.Windows.Forms.NativeWindow.DefWndProc(Messa ge& m)
at System.Windows.Forms.Control.DefWndProc(Message& m)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons
button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ListBox.WndProc(Message& m)
at System.Windows.Forms.ControlNativeWindow.OnMessage (Message& m)
at System.Windows.Forms.ControlNativeWindow.WndProc(M essage& m)
at System.Windows.Forms.NativeWindow.DebuggableCallba ck(IntPtr hWnd,
Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchM essageW(MSG& msg)
at
System.Windows.Forms.ComponentManager.System.Windo ws.Forms.UnsafeNativeMetho ds+IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32
reason, Int32 pvLoopData)
at System.Windows.Forms.ThreadContext.RunMessageLoopI nner(Int32 reason,
ApplicationContext context)
at System.Windows.Forms.ThreadContext.RunMessageLoop( Int32 reason,
ApplicationContext context)
at System.Windows.Forms.Application.RunDialog(Form form)
at System.Windows.Forms.Form.ShowDialog(IWin32Window owner)
at TrainGroundStation.Form1.menuItem6_Click(Object sender, EventArgs e)
in c:\luca_tt\vcproj\traingroundstation\groundstation train.cs:line 366
at System.Windows.Forms.MenuItem.OnClick(EventArgs e)
at System.Windows.Forms.MenuItemData.Execute()
at System.Windows.Forms.Command.Invoke()
at System.Windows.Forms.Command.DispatchID(Int32 id)
at System.Windows.Forms.Control.WmCommand(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Mes sage& m)
at System.Windows.Forms.ContainerControl.WndProc(Mess age& m)
at System.Windows.Forms.Form.WndProc(Message& m)
at System.Windows.Forms.ControlNativeWindow.OnMessage (Message& m)
at System.Windows.Forms.ControlNativeWindow.WndProc(M essage& m)
at System.Windows.Forms.NativeWindow.DebuggableCallba ck(IntPtr hWnd,
Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchM essageW(MSGIl
programma "[1476] TrainGroundStation.exe" è terminato con il codice 0
(0x0). & msg)
at
System.Windows.Forms.ComponentManager.System.Windo ws.Forms.UnsafeNativeMetho ds+IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32
reason, Int32 pvLoopData)
at System.Windows.Forms.ThreadContext.RunMessageLoopI nner(Int32 reason,
ApplicationContext context)
at System.Windows.Forms.ThreadContext.RunMessageLoop( Int32 reason,
ApplicationContext context)
at System.Windows.Forms.Application.Run(Form mainForm)
at TrainGroundStation.Form1.Main() in
c:\luca_tt\vcproj\traingroundstation\groundstation train.cs:line 524
Any help?
Greetings,
Luca
Hello Clay,
thanks for the tip. I havent tryed your tip yet, but adding (and removing)
directly the objects to the listbox's items collection called Items it works
nicely :) I ditched the use of the DataSource field.
Thanks again,
Luca
"ClayB [Syncfusion]" <cl***@syncfusion.com> ha scritto nel messaggio
news:%2****************@tk2msftngp13.phx.gbl... Try setting this.m_activation.SelectedIndex = 0 at the start of your
UpdateListBox. This will make sure the selected index is valid (unless the
list is empty) when the new list is being displayed for the first time.
======================
Clay Burch, .NET MVP
Visit www.syncfusion.com for the coolest tools
"Luca" <lu**@rewind.com> wrote in message
news:ua**************@tk2msftngp13.phx.gbl... Hello,
I'm using a windows form in which there is a standard ListBox control. I
want to add/remove objects from the ArrayList associated to the ListBox, and I want the ListBox immediately shows graphically the change: e.g. if I
remove an element from the ArrayList object, then that element should
not be no more displayed in the list box.
Actually i'm using this code below:
private void UpdateListBox (KActivationList p_aL)
{
this.m_activation.DataSource = null;
this.m_activation.DataSource = p_aL;
this.m_activation.ValueMember = "VerboseName";
this.m_activation.DisplayMember = "VerboseName";
m_activation.Invalidate ();
}
The UpdateListBox method is called whenever an item has been
removed/added to a KActivationList object, which is a derived class of ArrayList.
m_activation is the ListBox. In this way it seems to work. But I'm
getting *sometimes* this exception when I select with the mouse an item in the
list box after having deleted any item:
Exception not managed: System.ArgumentOutOfRangeException: Index out of
bounds. the value must be non negative or less than the set length..
Parameter name: index
at System.Collections.ArrayList.get_Item(Int32 index)
at System.Windows.Forms.CurrencyManager.EndCurrentEdi t()
at System.Windows.Forms.CurrencyManager.ChangeRecordS tate(Int32
newPosition, Boolean validating, Boolean endCurrentEdit, Boolean
firePositionChange, Boolean pullData)
at System.Windows.Forms.CurrencyManager.set_Position( Int32 value)
at System.Windows.Forms.ListBox.OnSelectedIndexChange d(EventArgs e)
at System.Windows.Forms.ListBox.WmReflectCommand(Mess age& m)
at System.Windows.Forms.ListBox.WndProc(Message& m)
at System.Windows.Forms.ControlNativeWindow.OnMessage (Message& m)
at System.Windows.Forms.ControlNativeWindow.WndProc(M essage& m)
at System.Windows.Forms.NativeWindow.DebuggableCallba ck(IntPtr hWnd,
Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.SendMessa ge(HandleRef
hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at System.Windows.Forms.Control.SendMessage(Int32 msg, IntPtr wparam,
IntPtr lparam)
at System.Windows.Forms.Control.ReflectMessageInterna l(IntPtr hWnd,
Message& m)
at System.Windows.Forms.Control.WmCommand(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Mes sage& m)
at System.Windows.Forms.ContainerControl.WndProc(Mess age& m)
at System.Windows.Forms.ParkingWindow.WndProc(Message & m)
at System.Windows.Forms.ControlNativeWindow.OnMessage (Message& m)
at System.Windows.Forms.ControlNativeWindow.WndProc(M essage& m)
at System.Windows.Forms.NativeWindow.DebuggableCallba ck(IntPtr hWnd,
Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.CallWindo wProc(IntPtr
wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at System.Windows.Forms.NativeWindow.DefWndProc(Messa ge& m)
at System.Windows.Forms.Control.DefWndProc(Message& m)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons
button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ListBox.WndProc(Message& m)
at System.Windows.Forms.ControlNativeWindow.OnMessage (Message& m)
at System.Windows.Forms.ControlNativeWindow.WndProc(M essage& m)
at System.Windows.Forms.NativeWindow.DebuggableCallba ck(IntPtr hWnd,
Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchM essageW(MSG&
msg) at
System.Windows.Forms.ComponentManager.System.Windo ws.Forms.UnsafeNativeMetho ds+IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32
reason, Int32 pvLoopData)
at System.Windows.Forms.ThreadContext.RunMessageLoopI nner(Int32
reason, ApplicationContext context)
at System.Windows.Forms.ThreadContext.RunMessageLoop( Int32 reason,
ApplicationContext context)
at System.Windows.Forms.Application.RunDialog(Form form)
at System.Windows.Forms.Form.ShowDialog(IWin32Window owner)
at TrainGroundStation.Form1.menuItem6_Click(Object sender, EventArgs
e) in c:\luca_tt\vcproj\traingroundstation\groundstation train.cs:line 366
at System.Windows.Forms.MenuItem.OnClick(EventArgs e)
at System.Windows.Forms.MenuItemData.Execute()
at System.Windows.Forms.Command.Invoke()
at System.Windows.Forms.Command.DispatchID(Int32 id)
at System.Windows.Forms.Control.WmCommand(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Mes sage& m)
at System.Windows.Forms.ContainerControl.WndProc(Mess age& m)
at System.Windows.Forms.Form.WndProc(Message& m)
at System.Windows.Forms.ControlNativeWindow.OnMessage (Message& m)
at System.Windows.Forms.ControlNativeWindow.WndProc(M essage& m)
at System.Windows.Forms.NativeWindow.DebuggableCallba ck(IntPtr hWnd,
Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchM essageW(MSGIl
programma "[1476] TrainGroundStation.exe" è terminato con il codice 0
(0x0). & msg)
at
System.Windows.Forms.ComponentManager.System.Windo ws.Forms.UnsafeNativeMetho ds+IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32
reason, Int32 pvLoopData)
at System.Windows.Forms.ThreadContext.RunMessageLoopI nner(Int32
reason, ApplicationContext context)
at System.Windows.Forms.ThreadContext.RunMessageLoop( Int32 reason,
ApplicationContext context)
at System.Windows.Forms.Application.Run(Form mainForm)
at TrainGroundStation.Form1.Main() in
c:\luca_tt\vcproj\traingroundstation\groundstation train.cs:line 524
Any help?
Greetings,
Luca
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