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.NET Forum / Windows Forms / WinForm Data Binding / July 2004

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DataGrid & IBindingList Binding Problem

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David Hoffer - 23 Jun 2004 14:08 GMT
Hello, can someone help me?

I have a DataGrid of which I assign its DataSource property to my custom
list object that implements the IBindingList interface and inherits
CollectionBase (I followed the CustomerList example in the msdn docs).

Everything seems fine when I run my application except...   The statement
that assigns the DataSource causes BeginEdit() to be called on my object in
my custom list and it does not call EndEdit().  This prevents me from being
able to actually edit any data in the grid because the first call to edit
never finishes.  And this call to edit is not called by me, it's called by
the framework.  The call stack is like this...

 xrite.retail.dll!XRite.Retail.PaletteInfo.BeginEdit() Line 193 C#

system.windows.forms.dll!System.Windows.Forms.CurrencyManager.OnCurrentChang
ed(System.EventArgs e = {System.EventArgs}) + 0xd4 bytes

system.windows.forms.dll!System.Windows.Forms.CurrencyManager.ChangeRecordSt
ate(int newPosition = 0, bool validating = true, bool endCurrentEdit =
false, bool firePositionChange = true, bool pullData = false) + 0x157 bytes

system.windows.forms.dll!System.Windows.Forms.CurrencyManager.UpdateIsBindin
g(bool force = false) + 0xd0 bytes

system.windows.forms.dll!System.Windows.Forms.CurrencyManager.UpdateIsBindin
g() + 0xd bytes

system.windows.forms.dll!System.Windows.Forms.BindingManagerBase.PushData()
+ 0x1d bytes

system.windows.forms.dll!System.Windows.Forms.CurrencyManager.CurrencyManage
r_PushData() + 0x47 bytes

system.windows.forms.dll!System.Windows.Forms.CurrencyManager.OnItemChanged(
System.Windows.Forms.ItemChangedEventArgs e = {Index=-1}) + 0x78 bytes

system.windows.forms.dll!System.Windows.Forms.CurrencyManager.SetDataSource(
System.Object dataSource = {XRite.Retail.Collections.PaletteInfoArrayList})
+ 0x14b bytes

system.windows.forms.dll!System.Windows.Forms.CurrencyManager.CurrencyManage
r(System.Object dataSource =
{XRite.Retail.Collections.PaletteInfoArrayList}) + 0x5d bytes

system.windows.forms.dll!System.Windows.Forms.BindingContext.EnsureListManag
er(System.Object dataSource =
{XRite.Retail.Collections.PaletteInfoArrayList}, string dataMember = "") +
0x11a bytes

system.windows.forms.dll!System.Windows.Forms.BindingContext.get_Item(System
.Object dataSource = {XRite.Retail.Collections.PaletteInfoArrayList}, string
dataMember = "") + 0x15 bytes

system.windows.forms.dll!System.Windows.Forms.DataGrid.Set_ListManager(Syste
m.Object newDataSource = {XRite.Retail.Collections.PaletteInfoArrayList},
string newDataMember = "", bool force = false, bool forceColumnCreation =
true) + 0x157 bytes

system.windows.forms.dll!System.Windows.Forms.DataGrid.Set_ListManager(Syste
m.Object newDataSource = {XRite.Retail.Collections.PaletteInfoArrayList},
string newDataMember = "", bool force = false) + 0x1c bytes

system.windows.forms.dll!System.Windows.Forms.DataGrid.set_DataSource(System
.Object value = {XRite.Retail.Collections.PaletteInfoArrayList}) + 0x190
bytes

It looks like the reason for the BeginEdit() is the endCurrentEdit parameter
being set to false.  Why is this false?  How can I change it to true?  Why
does the framework need to edit any object?  Can I turn this off?

-dh
Reply to this Message
Ernest Morariu - 04 Jul 2004 04:45 GMT
> Everything seems fine when I run my application except...   The statement
> that assigns the DataSource causes BeginEdit() to be called on my object in
> my custom list and it does not call EndEdit().  This prevents me from being
> able to actually edit any data in the grid because the first call to edit
> never finishes.

From msdn:

Implementations of the IEditableObject interface should keep track of
whether the BeginEdit has already been called and ignore subsequent calls to
BeginEdit.

Ernest

> Hello, can someone help me?
>
[quoted text clipped - 10 lines]
>
>   xrite.retail.dll!XRite.Retail.PaletteInfo.BeginEdit() Line 193 C#

system.windows.forms.dll!System.Windows.Forms.CurrencyManager.OnCurrentChang
> ed(System.EventArgs e = {System.EventArgs}) + 0xd4 bytes

system.windows.forms.dll!System.Windows.Forms.CurrencyManager.ChangeRecordSt
> ate(int newPosition = 0, bool validating = true, bool endCurrentEdit =
> false, bool firePositionChange = true, bool pullData = false) + 0x157 bytes

system.windows.forms.dll!System.Windows.Forms.CurrencyManager.UpdateIsBindin
> g(bool force = false) + 0xd0 bytes

system.windows.forms.dll!System.Windows.Forms.CurrencyManager.UpdateIsBindin
> g() + 0xd bytes

system.windows.forms.dll!System.Windows.Forms.BindingManagerBase.PushData()
> + 0x1d bytes

system.windows.forms.dll!System.Windows.Forms.CurrencyManager.CurrencyManage
> r_PushData() + 0x47 bytes

system.windows.forms.dll!System.Windows.Forms.CurrencyManager.OnItemChanged(
> System.Windows.Forms.ItemChangedEventArgs e = {Index=-1}) + 0x78 bytes

system.windows.forms.dll!System.Windows.Forms.CurrencyManager.SetDataSource(
> System.Object dataSource = {XRite.Retail.Collections.PaletteInfoArrayList})
> + 0x14b bytes

system.windows.forms.dll!System.Windows.Forms.CurrencyManager.CurrencyManage
> r(System.Object dataSource =
> {XRite.Retail.Collections.PaletteInfoArrayList}) + 0x5d bytes

system.windows.forms.dll!System.Windows.Forms.BindingContext.EnsureListManag
> er(System.Object dataSource =
> {XRite.Retail.Collections.PaletteInfoArrayList}, string dataMember = "") +
> 0x11a bytes

system.windows.forms.dll!System.Windows.Forms.BindingContext.get_Item(System
> .Object dataSource = {XRite.Retail.Collections.PaletteInfoArrayList}, string
> dataMember = "") + 0x15 bytes

system.windows.forms.dll!System.Windows.Forms.DataGrid.Set_ListManager(Syste
> m.Object newDataSource = {XRite.Retail.Collections.PaletteInfoArrayList},
> string newDataMember = "", bool force = false, bool forceColumnCreation =
> true) + 0x157 bytes

system.windows.forms.dll!System.Windows.Forms.DataGrid.Set_ListManager(Syste
> m.Object newDataSource = {XRite.Retail.Collections.PaletteInfoArrayList},
> string newDataMember = "", bool force = false) + 0x1c bytes

system.windows.forms.dll!System.Windows.Forms.DataGrid.set_DataSource(System
> .Object value = {XRite.Retail.Collections.PaletteInfoArrayList}) + 0x190
> bytes
[quoted text clipped - 4 lines]
>
> -dh
Reply to this Message
David Hoffer - 08 Jul 2004 15:17 GMT
I think I am doing this already.  Here is what I am doing...
public void BeginEdit()
{
if (!m_bInTxn)
{
 // Save backup copy of data...
 m_bInTxn = true;
}
}
public void CancelEdit()
{
if (m_bInTxn)
{
// Undo backup copy of data...
m_bInTxn = false;
}
}
public void EndEdit()
{
if (m_bInTxn)
{
m_bInTxn = false;
}
OnChanged();
}

> > Everything seems fine when I run my application except...   The statement
> > that assigns the DataSource causes BeginEdit() to be called on my object
[quoted text clipped - 31 lines]
> system.windows.forms.dll!System.Windows.Forms.CurrencyManager.OnCurrentChang
> > ed(System.EventArgs e = {System.EventArgs}) + 0xd4 bytes

system.windows.forms.dll!System.Windows.Forms.CurrencyManager.ChangeRecordSt
> > ate(int newPosition = 0, bool validating = true, bool endCurrentEdit =
> > false, bool firePositionChange = true, bool pullData = false) + 0x157
> bytes

system.windows.forms.dll!System.Windows.Forms.CurrencyManager.UpdateIsBindin
> > g(bool force = false) + 0xd0 bytes

system.windows.forms.dll!System.Windows.Forms.CurrencyManager.UpdateIsBindin
> > g() + 0xd bytes

system.windows.forms.dll!System.Windows.Forms.BindingManagerBase.PushData()
> > + 0x1d bytes

system.windows.forms.dll!System.Windows.Forms.CurrencyManager.CurrencyManage
> > r_PushData() + 0x47 bytes

system.windows.forms.dll!System.Windows.Forms.CurrencyManager.OnItemChanged(
> > System.Windows.Forms.ItemChangedEventArgs e = {Index=-1}) + 0x78 bytes

system.windows.forms.dll!System.Windows.Forms.CurrencyManager.SetDataSource(
> > System.Object dataSource =
> {XRite.Retail.Collections.PaletteInfoArrayList})
> > + 0x14b bytes

system.windows.forms.dll!System.Windows.Forms.CurrencyManager.CurrencyManage
> > r(System.Object dataSource =
> > {XRite.Retail.Collections.PaletteInfoArrayList}) + 0x5d bytes

system.windows.forms.dll!System.Windows.Forms.BindingContext.EnsureListManag
> > er(System.Object dataSource =
> > {XRite.Retail.Collections.PaletteInfoArrayList}, string dataMember = "") +
> > 0x11a bytes

system.windows.forms.dll!System.Windows.Forms.BindingContext.get_Item(System
> > .Object dataSource = {XRite.Retail.Collections.PaletteInfoArrayList},
> string
> > dataMember = "") + 0x15 bytes

system.windows.forms.dll!System.Windows.Forms.DataGrid.Set_ListManager(Syste
> > m.Object newDataSource = {XRite.Retail.Collections.PaletteInfoArrayList},
> > string newDataMember = "", bool force = false, bool forceColumnCreation =
> > true) + 0x157 bytes

system.windows.forms.dll!System.Windows.Forms.DataGrid.Set_ListManager(Syste
> > m.Object newDataSource = {XRite.Retail.Collections.PaletteInfoArrayList},
> > string newDataMember = "", bool force = false) + 0x1c bytes

system.windows.forms.dll!System.Windows.Forms.DataGrid.set_DataSource(System
> > .Object value = {XRite.Retail.Collections.PaletteInfoArrayList}) + 0x190
> > bytes
[quoted text clipped - 5 lines]
> >
> > -dh
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