Removing multiple items from a multi-select ListView

  • Thread starter Thread starter Phill W.
  • Start date Start date
P

Phill W.

(VB'2003)
What's the correct way to remove multiple, selected items from a
ListView control (say, from a ContextMenu)?

I ask because I'm getting a very annoying ArgumentOutOfRangeException
because the ListView seems to be trying to "re-select" items that are no
longer there!

for example, giventhat I have 3 items in my list:
Select the first and remove it - no problem.
Select the last /but one/ and remove it - still no problem.
Select the /last/ item and remove it - Boom!

ArgumentOutOfRangeException
Parameter name: '2' is not a valid value for 'displayIndex'
at S.W.F.ListViewItemCollection.getItem(Int32 displayIndex)
at S.W.F.ListView.LvnBeginDrag(MouseButtons buttons, NMLISTVIEW mnlv)
...

It's as if the "list" of select indices is being re-applied, even though
the items to which those items correspond[ed] have been removed.

Any suggestions?

Code: 
Dim iIndices As Integer()
ReDim iIndices(Me.lvMembers.SelectedIndices.Count - 1)
Me.lvMembers.SelectedIndices.CopyTo(iIndices, 0)

For iIndex As Integer = iIndices.Length - 1 To 0 Step -1
Dim oItem As ListViewItem _
= Me.lvMembers.Items(iIndices(iIndex))

oItem.Selected = False ' even tried this!
Me.lvMembers.Items.Remove(oItem)
Next

TIA,
Phill  W.
 
Why do you select the item to remove it
Get the index of the item you want to remove and use the
ListView.Items.RemoveAt method

hth,
Samuel
 
Samuel,
Why do you select the item to remove it
Click to expand...
I don't - I'm trying to "un-select" it in the vain hope that the
ListView control won't then try to redisplay it in a "selected" way (or
/any/ way, come to that), which is what's causing it to blow up.
Get the index of the item you want to remove and use the
ListView.Items.RemoveAt method
Click to expand...

Yep - tried that. Same results using Remove(item) and RemoveAt(index).

Regards,
Phill W.

Samuel said:
Why do you select the item to remove it
Get the index of the item you want to remove and use the
ListView.Items.RemoveAt method

hth,
Samuel

Phill W. said:
(VB'2003)
What's the correct way to remove multiple, selected items from a ListView
control (say, from a ContextMenu)?

I ask because I'm getting a very annoying ArgumentOutOfRangeException
because the ListView seems to be trying to "re-select" items that are no
longer there!

for example, giventhat I have 3 items in my list:
Select the first and remove it - no problem.
Select the last /but one/ and remove it - still no problem.
Select the /last/ item and remove it - Boom!

ArgumentOutOfRangeException
Parameter name: '2' is not a valid value for 'displayIndex'
at S.W.F.ListViewItemCollection.getItem(Int32 displayIndex)
at S.W.F.ListView.LvnBeginDrag(MouseButtons buttons, NMLISTVIEW mnlv)
...

It's as if the "list" of select indices is being re-applied, even though
the items to which those items correspond[ed] have been removed.

Any suggestions?

Code: 
Dim iIndices As Integer()
ReDim iIndices(Me.lvMembers.SelectedIndices.Count - 1)
Me.lvMembers.SelectedIndices.CopyTo(iIndices, 0)

For iIndex As Integer = iIndices.Length - 1 To 0 Step -1
Dim oItem As ListViewItem _
= Me.lvMembers.Items(iIndices(iIndex))

oItem.Selected = False ' even tried this!
Me.lvMembers.Items.Remove(oItem)
Next

TIA,
Phill  W.[/QUOTE]
[/QUOTE]
Click to expand...
Click to expand...
 
Phill said:
(VB'2003)
What's the correct way to remove multiple, selected items from a
ListView control (say, from a ContextMenu)?

I ask because I'm getting a very annoying ArgumentOutOfRangeException
because the ListView seems to be trying to "re-select" items that are no
longer there!

for example, giventhat I have 3 items in my list:
Select the first and remove it - no problem.
Select the last /but one/ and remove it - still no problem.
Select the /last/ item and remove it - Boom!

ArgumentOutOfRangeException
Parameter name: '2' is not a valid value for 'displayIndex'
at S.W.F.ListViewItemCollection.getItem(Int32 displayIndex)
at S.W.F.ListView.LvnBeginDrag(MouseButtons buttons, NMLISTVIEW mnlv)
...

It's as if the "list" of select indices is being re-applied, even though
the items to which those items correspond[ed] have been removed.

Any suggestions?

Code: 
Dim iIndices As Integer()
ReDim iIndices(Me.lvMembers.SelectedIndices.Count - 1)
Me.lvMembers.SelectedIndices.CopyTo(iIndices, 0)

For iIndex As Integer = iIndices.Length - 1 To 0 Step -1
Dim oItem As ListViewItem _
= Me.lvMembers.Items(iIndices(iIndex))

oItem.Selected = False ' even tried this!
Me.lvMembers.Items.Remove(oItem)
Next

TIA,
Phill  W.[/QUOTE]

At the risk of seeming to talk to myself (not a first, by any means) it
looks like the SelectedIndices might be a Red Herring.

I /only/ get this problem if the item corresponding to the last item I
selected (by Clicking and Ctrl-Clicking in the ListView) is removed, so...
If I select the last item in the list, then the first, I can remove them
both and the first item remains selected.
If I select the first item, then the last, and remove them - Boom!

Regards,
Phill  W.
Click to expand...
 
Maybe that,
When you actually remove an item then the index of the other items changes
and if say the maximum index value was 10 after removing any item it will be
9

You can do 1 of the following:
1. Record to some variables (array) a unique value of the items you want to
remove and find out the index of that item each time based on that value
then usse the removeAt

2. Reference all the items to remove to a created array of items then loop
through this array (I hope that the valuue of the index will change as you
go along)


hth,
Samuel Shulman



Phill W. said:
Samuel,
Why do you select the item to remove it
Click to expand...
I don't - I'm trying to "un-select" it in the vain hope that the ListView
control won't then try to redisplay it in a "selected" way (or /any/ way,
come to that), which is what's causing it to blow up.
Get the index of the item you want to remove and use the
ListView.Items.RemoveAt method
Click to expand...

Yep - tried that. Same results using Remove(item) and RemoveAt(index).

Regards,
Phill W.

Samuel said:
Why do you select the item to remove it
Get the index of the item you want to remove and use the
ListView.Items.RemoveAt method

hth,
Samuel

Phill W. said:
(VB'2003)
What's the correct way to remove multiple, selected items from a
ListView control (say, from a ContextMenu)?

I ask because I'm getting a very annoying ArgumentOutOfRangeException
because the ListView seems to be trying to "re-select" items that are no
longer there!

for example, giventhat I have 3 items in my list:
Select the first and remove it - no problem.
Select the last /but one/ and remove it - still no problem.
Select the /last/ item and remove it - Boom!

ArgumentOutOfRangeException
Parameter name: '2' is not a valid value for 'displayIndex'
at S.W.F.ListViewItemCollection.getItem(Int32 displayIndex)
at S.W.F.ListView.LvnBeginDrag(MouseButtons buttons, NMLISTVIEW mnlv)
...

It's as if the "list" of select indices is being re-applied, even though
the items to which those items correspond[ed] have been removed.

Any suggestions?

Code: 
Dim iIndices As Integer()
ReDim iIndices(Me.lvMembers.SelectedIndices.Count - 1)
Me.lvMembers.SelectedIndices.CopyTo(iIndices, 0)

For iIndex As Integer = iIndices.Length - 1 To 0 Step -1
Dim oItem As ListViewItem _
= Me.lvMembers.Items(iIndices(iIndex))

oItem.Selected = False ' even tried this!
Me.lvMembers.Items.Remove(oItem)
Next

TIA,
Phill  W.[/QUOTE]
[/QUOTE][/QUOTE]
Click to expand...
Click to expand...
Click to expand...
 
Samuel,

Found it!

Old habits die hard: I was displaying the Context Menu manually (using
ContextMenu.Show) but from the ListView's Mouse/Down/ event instead of
Mouse/Up/.

Moved my code into [ListView].MouseUp and everything works as expected!

Regards,
Phill W.

Samuel said:
Maybe that,
When you actually remove an item then the index of the other items changes
and if say the maximum index value was 10 after removing any item it will be
9

You can do 1 of the following:
1. Record to some variables (array) a unique value of the items you want to
remove and find out the index of that item each time based on that value
then usse the removeAt

2. Reference all the items to remove to a created array of items then loop
through this array (I hope that the valuue of the index will change as you
go along)


hth,
Samuel Shulman



Phill W. said:
Samuel,
Why do you select the item to remove it
Click to expand...
I don't - I'm trying to "un-select" it in the vain hope that the ListView
control won't then try to redisplay it in a "selected" way (or /any/ way,
come to that), which is what's causing it to blow up.
Get the index of the item you want to remove and use the
ListView.Items.RemoveAt method
Click to expand...
Yep - tried that. Same results using Remove(item) and RemoveAt(index).

Regards,
Phill W.

Samuel said:
Why do you select the item to remove it
Get the index of the item you want to remove and use the
ListView.Items.RemoveAt method

hth,
Samuel

(VB'2003)
What's the correct way to remove multiple, selected items from a
ListView control (say, from a ContextMenu)?

I ask because I'm getting a very annoying ArgumentOutOfRangeException
because the ListView seems to be trying to "re-select" items that are no
longer there!

for example, giventhat I have 3 items in my list:
Select the first and remove it - no problem.
Select the last /but one/ and remove it - still no problem.
Select the /last/ item and remove it - Boom!

ArgumentOutOfRangeException
Parameter name: '2' is not a valid value for 'displayIndex'
at S.W.F.ListViewItemCollection.getItem(Int32 displayIndex)
at S.W.F.ListView.LvnBeginDrag(MouseButtons buttons, NMLISTVIEW mnlv)
...

It's as if the "list" of select indices is being re-applied, even though
the items to which those items correspond[ed] have been removed.

Any suggestions?

Code: 
Dim iIndices As Integer()
ReDim iIndices(Me.lvMembers.SelectedIndices.Count - 1)
Me.lvMembers.SelectedIndices.CopyTo(iIndices, 0)

For iIndex As Integer = iIndices.Length - 1 To 0 Step -1
Dim oItem As ListViewItem _
= Me.lvMembers.Items(iIndices(iIndex))

oItem.Selected = False ' even tried this!
Me.lvMembers.Items.Remove(oItem)
Next

TIA,
Phill  W.[/QUOTE][/QUOTE]
[/QUOTE]
Click to expand...
Click to expand...
Click to expand...
 
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