Weird issues with DataGrid

G

Guest

I have a DataGrid and a DataTable. When my form loads I create the DataTable
with the appropriate columns and use it for the DataGrids.DataSource.

Later on in my app, I alter the DataTable:

dt.BeginLoadData();
for(int i = 0; i < _movesArrayList.Count; i++)
{
string[] columnValues = ((string)_movesArrayList).Split(COL_SEPARATOR);
DataRow _moveRow = dt.NewRow();
_moveRow[0] = columnValues[0];
_moveRow[1] = columnValues[1];
_moveRow[2] = columnValues[2];
dt.Rows.Add(_moveRow);
}
dt.EndLoadData();


The thing is, every once in a while my app crashes and I get the following
error:

A first chance exception of type 'System.NullReferenceException' occurred in
system.windows.forms.dll
Additional information: Object reference not set to an instance of an object.

According to the stack trace it occurs at dt.EndLoadData() and in the method

System.Windows.Forms.DataGridToolTip::CreateToolTipHandle()

I can't reliably reproduce it. Has anyone seen anyhting like this before?

Thanks.

Following is the stack trace:
system.windows.forms.dll!System.Windows.Forms.DataGridToolTip::CreateToolTipHandle() + 0x160 bytes
system.windows.forms.dll!System.Windows.Forms.DataGrid::ResetToolTip() +
0x44 bytes
system.windows.forms.dll!System.Windows.Forms.DataGrid::OnLayout(System.Windows.Forms.LayoutEventArgs
levent = {System.Windows.Forms.LayoutEventArgs}) + 0xa7 bytes
system.windows.forms.dll!System.Windows.Forms.Control::performLayout(System.Windows.Forms.Control
affectedControl = null, String* affectedProperty = null) + 0x7b bytes
system.windows.forms.dll!System.Windows.Forms.Control::performLayout() +
0x13 bytes
system.windows.forms.dll!System.Windows.Forms.DataGrid::ResetUIState() +
0x34 bytes
system.windows.forms.dll!System.Windows.Forms.DataGrid::SetDataGridRows(System.Windows.Forms.DataGridRow[]
newRows = null, __int32 newRowsLength = 212) + 0x7e bytes
system.windows.forms.dll!System.Windows.Forms.DataGrid::RecreateDataGridRows() + 0x5e bytes
system.windows.forms.dll!System.Windows.Forms.DataGrid::DataSource_Changed(System.Object
sender = {System.Windows.Forms.CurrencyManager}, System.EventArgs ea =
{System.EventArgs}) + 0x143 bytes
system.windows.forms.dll!System.Windows.Forms.DataGrid::DataSource_ItemChanged(System.Object
sender = {System.Windows.Forms.CurrencyManager},
System.Windows.Forms.ItemChangedEventArgs ea = {Index=-1}) + 0x3d bytes
system.windows.forms.dll!System.Windows.Forms.CurrencyManager::OnItemChanged(System.Windows.Forms.ItemChangedEventArgs e = {Index=-1}) + 0xa4 bytes
system.windows.forms.dll!System.Windows.Forms.CurrencyManager::UpdateIsBinding(bool force = false) + 0x12d bytes
system.windows.forms.dll!System.Windows.Forms.CurrencyManager::UpdateIsBinding() + 0x11 bytes
system.windows.forms.dll!System.Windows.Forms.CurrencyManager::List_ListChanged(System.Object
sender = {System.Data.DataView}, System.ComponentModel.ListChangedEventArgs e
= {System.ComponentModel.ListChangedEventArgs}) + 0x159 bytes
system.data.dll!System.Data.DataView::OnListChanged(System.ComponentModel.ListChangedEventArgs
e = {System.ComponentModel.ListChangedEventArgs}) + 0x48 bytes
system.data.dll!System.Data.DataView::IndexListChanged(System.Object sender
= {System.Data.Index}, System.ComponentModel.ListChangedEventArgs e =
{System.ComponentModel.ListChangedEventArgs}) + 0x43 bytes
system.data.dll!System.Data.DataView::FireEvent(System.Data.TargetEvent
targetEvent = IndexListChanged, System.Object sender = {System.Data.Index},
System.EventArgs e = {System.ComponentModel.ListChangedEventArgs}) + 0x4c
bytes
system.data.dll!System.Data.DataViewListener::IndexListChanged(System.Object
sender = {System.Data.Index}, System.ComponentModel.ListChangedEventArgs e =
{System.ComponentModel.ListChangedEventArgs}) + 0x3d bytes
system.data.dll!System.Data.Index::OnListChanged(System.ComponentModel.ListChangedEventArgs e = {System.ComponentModel.ListChangedEventArgs}) + 0x29 bytes
system.data.dll!System.Data.Index::Reset() + 0x1c bytes
system.data.dll!System.Data.DataTable::EndLoadData() + 0xc1 bytes
 
G

Guest

Try doing it without the BeginLoadData()
and EndLoadData() calls, e.g.:

for(int i = 0; i < _movesArrayList.Count; i++)
{
string[] columnValues = ((string)_movesArrayList).Split(COL_SEPARATOR);
DataRow _moveRow = dt.NewRow();
_moveRow[0] = columnValues[0];
_moveRow[1] = columnValues[1];
_moveRow[2] = columnValues[2];
dt.Rows.Add(_moveRow);
}

Yes, I know it's supposed to be faster, but if it blows up, its not good for
anything IMHO.

See if it doesn't go away. Seen this one once before, have no idea why it
happens.
Peter

--
Co-founder, Eggheadcafe.com developer portal:
http://www.eggheadcafe.com
UnBlog:
http://petesbloggerama.blogspot.com




Flack said:
I have a DataGrid and a DataTable. When my form loads I create the DataTable
with the appropriate columns and use it for the DataGrids.DataSource.

Later on in my app, I alter the DataTable:

dt.BeginLoadData();
for(int i = 0; i < _movesArrayList.Count; i++)
{
string[] columnValues = ((string)_movesArrayList).Split(COL_SEPARATOR);
DataRow _moveRow = dt.NewRow();
_moveRow[0] = columnValues[0];
_moveRow[1] = columnValues[1];
_moveRow[2] = columnValues[2];
dt.Rows.Add(_moveRow);
}
dt.EndLoadData();


The thing is, every once in a while my app crashes and I get the following
error:

A first chance exception of type 'System.NullReferenceException' occurred in
system.windows.forms.dll
Additional information: Object reference not set to an instance of an object.

According to the stack trace it occurs at dt.EndLoadData() and in the method

System.Windows.Forms.DataGridToolTip::CreateToolTipHandle()

I can't reliably reproduce it. Has anyone seen anyhting like this before?

Thanks.

Following is the stack trace:
system.windows.forms.dll!System.Windows.Forms.DataGridToolTip::CreateToolTipHandle() + 0x160 bytes
system.windows.forms.dll!System.Windows.Forms.DataGrid::ResetToolTip() +
0x44 bytes
system.windows.forms.dll!System.Windows.Forms.DataGrid::OnLayout(System.Windows.Forms.LayoutEventArgs
levent = {System.Windows.Forms.LayoutEventArgs}) + 0xa7 bytes
system.windows.forms.dll!System.Windows.Forms.Control::performLayout(System.Windows.Forms.Control
affectedControl = null, String* affectedProperty = null) + 0x7b bytes
system.windows.forms.dll!System.Windows.Forms.Control::performLayout() +
0x13 bytes
system.windows.forms.dll!System.Windows.Forms.DataGrid::ResetUIState() +
0x34 bytes
system.windows.forms.dll!System.Windows.Forms.DataGrid::SetDataGridRows(System.Windows.Forms.DataGridRow[]
newRows = null, __int32 newRowsLength = 212) + 0x7e bytes
system.windows.forms.dll!System.Windows.Forms.DataGrid::RecreateDataGridRows() + 0x5e bytes
system.windows.forms.dll!System.Windows.Forms.DataGrid::DataSource_Changed(System.Object
sender = {System.Windows.Forms.CurrencyManager}, System.EventArgs ea =
{System.EventArgs}) + 0x143 bytes
system.windows.forms.dll!System.Windows.Forms.DataGrid::DataSource_ItemChanged(System.Object
sender = {System.Windows.Forms.CurrencyManager},
System.Windows.Forms.ItemChangedEventArgs ea = {Index=-1}) + 0x3d bytes
system.windows.forms.dll!System.Windows.Forms.CurrencyManager::OnItemChanged(System.Windows.Forms.ItemChangedEventArgs e = {Index=-1}) + 0xa4 bytes
system.windows.forms.dll!System.Windows.Forms.CurrencyManager::UpdateIsBinding(bool force = false) + 0x12d bytes
system.windows.forms.dll!System.Windows.Forms.CurrencyManager::UpdateIsBinding() + 0x11 bytes
system.windows.forms.dll!System.Windows.Forms.CurrencyManager::List_ListChanged(System.Object
sender = {System.Data.DataView}, System.ComponentModel.ListChangedEventArgs e
= {System.ComponentModel.ListChangedEventArgs}) + 0x159 bytes
system.data.dll!System.Data.DataView::OnListChanged(System.ComponentModel.ListChangedEventArgs
e = {System.ComponentModel.ListChangedEventArgs}) + 0x48 bytes
system.data.dll!System.Data.DataView::IndexListChanged(System.Object sender
= {System.Data.Index}, System.ComponentModel.ListChangedEventArgs e =
{System.ComponentModel.ListChangedEventArgs}) + 0x43 bytes
system.data.dll!System.Data.DataView::FireEvent(System.Data.TargetEvent
targetEvent = IndexListChanged, System.Object sender = {System.Data.Index},
System.EventArgs e = {System.ComponentModel.ListChangedEventArgs}) + 0x4c
bytes
system.data.dll!System.Data.DataViewListener::IndexListChanged(System.Object
sender = {System.Data.Index}, System.ComponentModel.ListChangedEventArgs e =
{System.ComponentModel.ListChangedEventArgs}) + 0x3d bytes
system.data.dll!System.Data.Index::OnListChanged(System.ComponentModel.ListChangedEventArgs e = {System.ComponentModel.ListChangedEventArgs}) + 0x29 bytes
system.data.dll!System.Data.Index::Reset() + 0x1c bytes
system.data.dll!System.Data.DataTable::EndLoadData() + 0xc1 bytes
FloorsTest.exe!FloorsTest.Maze.FillResultsDataGrid() Line 805 C#
Click to expand...
Click to expand...
 
G

Guest

I tried removing the BeginLoadData() and EndLoadData() and now I get a
different error but still at

system.windows.forms.dll!System.Windows.Forms.DataGridToolTip::CreateToolTipHandle() + 0x160 bytes

The error is:

A first chance exception of type
'System.Runtime.InteropServices.SEHException' occurred in
system.windows.forms.dll
Additional information: External component has thrown an exception.

This error occurs in dt.Rows.Add(_moveRow);

I've never seen such an error before. Also, if I have to fill the grid
without using Begin and EndLoadData (and I have many rows to add) it's going
to be pretty slow and that would suck.

Peter Bromberg said:
Try doing it without the BeginLoadData()
and EndLoadData() calls, e.g.:

for(int i = 0; i < _movesArrayList.Count; i++)
{
string[] columnValues = ((string)_movesArrayList).Split(COL_SEPARATOR);
DataRow _moveRow = dt.NewRow();
_moveRow[0] = columnValues[0];
_moveRow[1] = columnValues[1];
_moveRow[2] = columnValues[2];
dt.Rows.Add(_moveRow);
}

Yes, I know it's supposed to be faster, but if it blows up, its not good for
anything IMHO.

See if it doesn't go away. Seen this one once before, have no idea why it
happens.
Peter

--
Co-founder, Eggheadcafe.com developer portal:
http://www.eggheadcafe.com
UnBlog:
http://petesbloggerama.blogspot.com




Flack said:
I have a DataGrid and a DataTable. When my form loads I create the DataTable
with the appropriate columns and use it for the DataGrids.DataSource.

Later on in my app, I alter the DataTable:

dt.BeginLoadData();
for(int i = 0; i < _movesArrayList.Count; i++)
{
string[] columnValues = ((string)_movesArrayList).Split(COL_SEPARATOR);
DataRow _moveRow = dt.NewRow();
_moveRow[0] = columnValues[0];
_moveRow[1] = columnValues[1];
_moveRow[2] = columnValues[2];
dt.Rows.Add(_moveRow);
}
dt.EndLoadData();


The thing is, every once in a while my app crashes and I get the following
error:

A first chance exception of type 'System.NullReferenceException' occurred in
system.windows.forms.dll
Additional information: Object reference not set to an instance of an object.

According to the stack trace it occurs at dt.EndLoadData() and in the method

System.Windows.Forms.DataGridToolTip::CreateToolTipHandle()

I can't reliably reproduce it. Has anyone seen anyhting like this before?

Thanks.

Following is the stack trace:
system.windows.forms.dll!System.Windows.Forms.DataGridToolTip::CreateToolTipHandle() + 0x160 bytes
system.windows.forms.dll!System.Windows.Forms.DataGrid::ResetToolTip() +
0x44 bytes
system.windows.forms.dll!System.Windows.Forms.DataGrid::OnLayout(System.Windows.Forms.LayoutEventArgs
levent = {System.Windows.Forms.LayoutEventArgs}) + 0xa7 bytes
system.windows.forms.dll!System.Windows.Forms.Control::performLayout(System.Windows.Forms.Control
affectedControl = null, String* affectedProperty = null) + 0x7b bytes
system.windows.forms.dll!System.Windows.Forms.Control::performLayout() +
0x13 bytes
system.windows.forms.dll!System.Windows.Forms.DataGrid::ResetUIState() +
0x34 bytes
system.windows.forms.dll!System.Windows.Forms.DataGrid::SetDataGridRows(System.Windows.Forms.DataGridRow[]
newRows = null, __int32 newRowsLength = 212) + 0x7e bytes
system.windows.forms.dll!System.Windows.Forms.DataGrid::RecreateDataGridRows() + 0x5e bytes
system.windows.forms.dll!System.Windows.Forms.DataGrid::DataSource_Changed(System.Object
sender = {System.Windows.Forms.CurrencyManager}, System.EventArgs ea =
{System.EventArgs}) + 0x143 bytes
system.windows.forms.dll!System.Windows.Forms.DataGrid::DataSource_ItemChanged(System.Object
sender = {System.Windows.Forms.CurrencyManager},
System.Windows.Forms.ItemChangedEventArgs ea = {Index=-1}) + 0x3d bytes
system.windows.forms.dll!System.Windows.Forms.CurrencyManager::OnItemChanged(System.Windows.Forms.ItemChangedEventArgs e = {Index=-1}) + 0xa4 bytes
system.windows.forms.dll!System.Windows.Forms.CurrencyManager::UpdateIsBinding(bool force = false) + 0x12d bytes
system.windows.forms.dll!System.Windows.Forms.CurrencyManager::UpdateIsBinding() + 0x11 bytes
system.windows.forms.dll!System.Windows.Forms.CurrencyManager::List_ListChanged(System.Object
sender = {System.Data.DataView}, System.ComponentModel.ListChangedEventArgs e
= {System.ComponentModel.ListChangedEventArgs}) + 0x159 bytes
system.data.dll!System.Data.DataView::OnListChanged(System.ComponentModel.ListChangedEventArgs
e = {System.ComponentModel.ListChangedEventArgs}) + 0x48 bytes
system.data.dll!System.Data.DataView::IndexListChanged(System.Object sender
= {System.Data.Index}, System.ComponentModel.ListChangedEventArgs e =
{System.ComponentModel.ListChangedEventArgs}) + 0x43 bytes
system.data.dll!System.Data.DataView::FireEvent(System.Data.TargetEvent
targetEvent = IndexListChanged, System.Object sender = {System.Data.Index},
System.EventArgs e = {System.ComponentModel.ListChangedEventArgs}) + 0x4c
bytes
system.data.dll!System.Data.DataViewListener::IndexListChanged(System.Object
sender = {System.Data.Index}, System.ComponentModel.ListChangedEventArgs e =
{System.ComponentModel.ListChangedEventArgs}) + 0x3d bytes
system.data.dll!System.Data.Index::OnListChanged(System.ComponentModel.ListChangedEventArgs e = {System.ComponentModel.ListChangedEventArgs}) + 0x29 bytes
system.data.dll!System.Data.Index::Reset() + 0x1c bytes
system.data.dll!System.Data.DataTable::EndLoadData() + 0xc1 bytes
FloorsTest.exe!FloorsTest.Maze.FillResultsDataGrid() Line 805 C#
Click to expand...
Click to expand...
Click to expand...
 

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