Wpf - Refresh TreeView CollectionViewSource ObservableCollection Item Changed
Apr 23, 2011
I have the following setup for a treeview:
<local:BuddyManager x:Key="bmBuddyManager" />
<CollectionViewSource x:Key="cvsBuddyManager"
Source="{Binding Source={StaticResource bmBuddyManager}, Path=Buddies}">
[Code]....
The Binding and grouping work well, the only issue is when I set a particular 'buddy' to online or blocked the child nodes do not move or change.
I am trying to get this to work like an MSN Treeview where people go offline and online.
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Mar 22, 2009
I want to be able to add a range and get updated for the entire bulk. I also want to be able to cancel the action before it's done (i.e. collection changing besides the 'changed').
[Code]...
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Mar 26, 2012
I'm attempting to write a deployment tool using the TreeView. I followed a couple of tutorials I found online for populating the treeview with folders/subfolders/and files. That all works and my functionality for processing my file deployment seems to be ok, but I'm having a display issue.
My treeView displays my folder structure and the files inside each folder properly, even attaching the correct icon image to each folder / file.
If I click the + to expand or collapse a node (folder) everything is still fine, but if I perform a single click on a folder, it appears the _NodeMouseClick event is firing and not refreshing my contents correctly. Any subfolders are no longer displayed, and the files now have the folder icon. If I collapse and re-expand the folder node, everything goes back the way it should.[code]...
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Dec 27, 2009
I have a FileSystemWatcher object watching my database file for changes and when it detects any changes I want it to update my treeview in my application without doing a full refresh
The Treeview has 3 levels: Root Node is the "Project" the next level down is the "Machine" and the third level is the "Assessment". Each node has the database primary key value set as the Tag. My primary keys are set to Auto Increment starting at 1.
I just can't get my head around it. I end up banging my head against the brick wall. Every way I think of ends up seeming really long winded.
I have developed my own database layer and at the moment when the form containing the treeview is notified of the changes I receive a list of all the row's ID field values in 3 separate arrays. I need some logic to take the treeview and these arrays and add to the treeview what is new and remove anything that has been deleted - nothing more.
The application is notified of the changes on a different thread so any solution would be executed on a different thread if that's of any relevance.
I know essentially I will be looking at two loops one to see what should be added and one to see what should be removed for each level. How these should be nested just makes my head want to explode!!!
But then when I know which Id to remove for example how do I then remove it - with yet more loops to find that tag in the treeview and remove it?? If I see a new assessment how do I know which parent node to add this to in the treeview? I can retrieve what machine/project it relates to from my database layer without any problems but then that's more loops.
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Feb 16, 2011
I have it all setup to refresh the treeview and it works fine, but for some reason I can't get it to remember the last selected node the user was on
Private Sub Timer2_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles Timer2.Tick
Dim curNode As TreeNode = tvFolders.SelectedNode
[Code].....
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Jul 26, 2011
i have a treeview with 8 Root items, my program needs to add items to the treeview without me selecting the proper root or item, the root items have been coded so they cannot be deleted, but i'm not sure how to get the software to place data in a particular root by what its name is. when you add children the indexs change so im not sure where to begin. heres an example
[Code]...
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May 15, 2009
Is there any way to get the index of the changed item? I couldn't find any examples.
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May 7, 2012
I have a window which has 8 items in a listview along with 2 radio buttons below the listview. The user is able to select one or more selections in the listview and turn the selection on or off with the radio buttons(live, prior to hitting the submit button), my question is how do I tell which selection was changed? I was going to put the one or more selections into a string/array and use that later for some messages once the user hits the submit button. I can almost think of it but can't quite get there, i'll be using an if/else with the .selected option in listview items but am not sure how to tell if the user, say,goes back and changes the option from On to Off(Off originally)to remove that option from the array.
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May 19, 2012
When I have a listbox full of items and scrolled such that topindex is not zero/first item, changing the value of the top item causes the list to scroll up by one.I can compensate for that easily by changing topindex after the listbox1.items(index)=value statement, but does anyone know why it happens or if there is some property I'm overlooking?
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Apr 13, 2009
I want to filter a collectionviewsource using a filter I've written, but I'm not sure how I can apply the filter to it?
Here is my collection view source:
<Grid.Resources>
<CollectionViewSource x:Key="myCollectionView"
Source="{Binding Path=Query4, Source={x:Static Application.Current}}">
[code]....
gives me the error: Failed object initialization (ISupportInitialize.EndInit).'System.Windows.Data.BindingListCollectionView'view does not support filtering. Error at object 'myCollectionView'
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Feb 5, 2009
im trying to add a text changed method to my listview item. all the items are dynamicly created so i would think id have to use an addhandler listviewitem1.textChanged addressof listviewitems_click where listviewitems_click is the generic sub to handle the click. but the listviewitem control doesnt have a text changed event, but you can rename the text in the control anyway.
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Nov 22, 2009
I use datasets to hold rows of vendor data and case data and such.
I would like to be able to regularly refresh the rows in these datasets that have been changed by other users touching this same database.
In the app we update like this:
_adapter.Update(_casetable)
That looks through the dataset for rows I've changed and calls the UPDATE sprocs.
Let's say I know that case # 12345 has been changed. How would I cause a refresh of the dataset for that case - getting new data from the DB?
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Oct 10, 2011
My WPF 4.0 data application builds a CollectionViewSource for a table from my Entities returned from the data service. I can verify with the debugger that data is populated to my CollectionViewSource but when I try to CType it's view to a BindingListCollectionView I get "System.InvalidCastException was caught
[Code]....
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Feb 22, 2011
I'm using a textbox to supply a filter for the datasouce which is bound to a listbox. It works (mostly) with a few exceptions, one being i was to restrict the height of the listbox to the number of entries (upto a maximum number), so a bit like a combobox (which in effect is what I'm writing). One of the problems is when the number of entries changes there does not seem to be an event raised, although the OnDrawItem is called for the items to be displayed (the displayed ones!) Is there anyway to find out (in a derived listbox) when the number of entries has changed in the datasource?
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Mar 23, 2012
I have been trying to do this for ages and having no joy whatsoever.
I have a ribbon window of the following hierarchy:
MainWindow
MainContent (Tab Control)
TabContainerViewModel
ViewModelBase
View model base has an ObservableCollection of tabs type ViewModelBase. The Tab Control itself is binding fine to these, displaying appropriate view models. I have 2 problems however, I want a "NotepadView" (Of type viewmodelbase) to be replicated numerous times (one view many view models).
At the minute, I have 4 views (NotePadViewModelx where x is 1-4) with corresponding viewmodels, this is because each view had the same text per tab. Now I have individual views per tab.
When I type into tab 1 and switch to tab 2, I lose what I typed in tab one when I click back.
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Sep 17, 2009
The ComboBox Items collection is an ObjectCollection, so of course you can store anything you want in there, but that means you don't get a Text property like you would with, say, a ListViewItem. The ComboBox displays the items by calling ToString() on each item, or using reflection if the DisplayMember property is set.
My ComboBox is in DropDownList mode. I have a situation where I want to refresh the item text of a single item in the list when it gets selected by the user. The problem is that the ComboBox doesn't re-query for the text at any time besides when it loads up, and I can't figure out how else to do what I want besides removing and re-adding the selected item like so:
PlantComboBoxItem selectedItem = cboPlants.SelectedItem as PlantComboBoxItem;
// ...
cboPlants.BeginUpdate();
int selectedIndex = cboPlants.SelectedIndex;
[Code]....
This code works fine, except for the fact that my SelectedIndex event ends up getting fired twice (once on the original user event, and then again when I re-set the property in this code). In this case, it's not a big deal that the event is fired twice, but it's inefficient, and I hate that. I could rig up a flag so it exits the event the second time, but that's hacking.
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Feb 22, 2011
dim oXT As New Generic.SortedDictionary(Of String, MyClass)
[Code]...
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Jul 30, 2009
I have a class that contains a collection of another class. See below
Public Class Spot
Private mActive As Boolean
Public Sub New()
[Code]....
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Jul 14, 2010
I'm trying to make the textbox field active when listbox selecteditems is change so I know I have to but something in the selecteditemchanged action of the listbox, but what?I tried:
Private Sub ListBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged
TextBox1.Enabled = True
End Sub
But it didn't work..
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Jul 13, 2010
If cmOptions.Visible Then
Return
End If
I have a refreshing process that updates a listview every ten seconds. If the context menu is open for a selected item it should return and not refresh?
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Nov 15, 2011
I have a form to manage student. When I add, the data appear on ListView and TreeView at the same time and the same data. Everything works perfectly.
But one proble about Delete button. I choose the line from the ListView and Delete it. The ListView delete the item perfectly. But I don't know how to delete the item on ListView and automatically delete the item on the TreeView.
Note: When you insert the data to ListView and TreeView. When you fill the information into the textbox. Remember after that choose class on TreeView and Click BUTTON ADD.
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Jul 11, 2009
So I have a treeview control. Let's abbreviate it like this:
Code:
- Mechanical
+ Engine
+ Transmission
+ Other
[Code]...
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Jul 20, 2009
I have a search function that opens a showdialog form that has a listview of items returned from the user search. The idea is the user selects from the listview and the matching item then selects in the tree view.
Okay so all works fine except that the selected item in the treeview does not highlight in blue like it should. It does indeed select it but it does not highlight.[code]...
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Dec 3, 2009
I'd like to select a node (item) in the TreeView control to get its path information as a string. I'm finding it's not like selecting an item in a listbox.
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Dec 19, 2011
When a user clicks on a treeview item, how can I detect if it is a child item or not?
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Aug 22, 2009
I am trying to make it so when someone clicks on an item from a treeview it will show lets say and image. And when they click on another it will show lets say a button. How do I do this?
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Jun 11, 2012
I am trying to drag an item from treeview node and number of movable picturebox should be created on windows form as we drag.But in my programme, we can drag a parent node also, and only one picturebox is created.
Public Class Form1
Dim pic As New PictureBox
Public drag As Boolean = False
[code].....
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Mar 23, 2010
I have been playing with, and researching, this all day and can't figure it out. I have a Windows Explorer style form with a TreeView and a ListView. I've populated the TreeView with directories and when a node is selected, the ListView fills with the contents of the directory associated with that node. No problem there, but I want to be able to select a directory in the ListView and automatically select the associated node in the TreeView, just like it works in Windows Explorer. All the information I've found online tells me how to populate the ListView from the TreeView, but I haven't found any good examples of how to populate the TreeView from the ListView.
[Code]...
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Feb 3, 2009
I've got a right-click menu that comes up in a treeview - with an option to ADD to that parent node or delete a child node.
Currently I'm using the SELECTEDNODE - but what I really want to do is change the "selected node" when the right-click occurs. But I'm having a hard time seeing how to do that...
How do you use this event properly??
Private Sub CapabilitiesTreeView_MouseClick(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles CapabilitiesTreeView.MouseClick
Me.CapabilitiesTreeView.SelectedNode =
End Sub
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May 14, 2011
I have a problems with my application..
1. collapse and expand treeview when i click plus sign (+) on treeview, treeview didn't expand subfolder but when i click image, treeview expand it.
2. showing path that i check on treeview when i check the treeview then i'm click the button, then return path that i check
This is my code..
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