Wpf combobox selectionchanged not firing. I am trying to bind collection of string to combobox.
Wpf combobox selectionchanged not firing. it’s not being triggered by a user action and 2. I tried PreviewKeyDown, but it is not A ComboBox that appears via a template in a ListBox will raise the SelectionChanged event of that ListBox - even if the user didn't select a new ListBoxItem. Jul 23, 2014 · When one of my combo boxes is just opened and closed, no value changed in it, the event is not triggerd (this is the default behaviour of a combobox). MainWindow. Edit: I forgot to mention that I has custom DataTemplate on my Combobox. How can I do it? Mar 28, 2010 · The selection events for Type A or B are firing instead of the Type C events, so the ComboBox is never changing its value reliably. Actually, I have some method, and I called this method in Combobox Drop down event and that causing the item source to reset. I added TouchDown and MouseDown event handler, but it never fire up when I touch on the combobox. When I set SelectedIndex property, it fires a SelectionChanged event, which is the correct behavior. Is there any way to do this? Apr 25, 2013 · I believe that changing the ItemTemplate may have overriden some of this ability because I do not receive the SelectionChanged event at the control level or application level. Oct 12, 2011 · WPF Combo Boxes will not change the selected item if the currently selected item and the new one that selected are considered equal by the object. What I plan to do is to have the drop down listed down when I touch or click on the combobox. Enough talking: let's build a small Feb 3, 2016 · I am new to C# and MVVM, and I've spent all day trying to get the value of a ComboBox to my ViewModel on SelectionChanged. If I use a List<string> for the Item Source, and the SelectedItem has the same name as the previous item, it will not fire the ComboBox SelectionChanged event. I would think if I'm right that there is some sort of SelectionRegion XAML tag that I can put the DataTemplate innards into. Equals() method called on the newly selected object (i. public ObservableCollection<string> ListString {get; set;} Binding and datacontext are set as follows <Window Oct 11, 2017 · Everything works, the Window Load properly, the List is populated in the ComboBox, but when the default selection is made my <i:EventTrigger EventName="SelectionChanged"> does not trigger and the rest of the application configuration is not triggered unless I make a manual selection change ?! Nov 10, 2015 · All, I have a combobox in WPF. Mar 28, 2014 · I am using a WPF Combobox and performing operations on the SelectionChanged event. The Source property will tell you which element raised the event, and you can use this to determine if the Remarks. But this does not work, when removing SelectionUnit="Cell" the above works, but i cannot do that of course since you should not be able to select a whole row. SelectedIndex; Debug. The combobox items source is bound to my view model. One way to achieve this is to handle the SelectionChanged event of the ComboBox and check the Source property of the SelectionChangedEventArgs. After that the user can select an item, and when they select it there I SelectionChanged event get's fired iand I dow a whole bunch of things on the page based on the dropdown selection. I have not had luck in finding anything like but in wpf i cannot found event "SelectedIndexChanged" instead of i can found event "SelectionChanged" but i have a problem when is use it before index of combobox event work but i want to after index change show my code in event "SelectionChanged" private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e) { MessageBox Mar 25, 2019 · ComboBox- SelectionChanged event has old value, not new value. But DataGridView1_SelectionChanged event is firing multiple times. I am not sure where the bug is. For selection I added DataGridView1_SelectionChanged event. 0. SelectionChanged does not fire. Columns["ID"]. In the debugger, the code for handling the drag and drop is triggering on the next ListBoxItem that's located underneath the ComboBox. But I want some weird functionalities, I want to stop the Selection Changed event from firing. Does Not Fire SelectionChanged Event. cs: get { return _mySelectedItem; } set. 7. If you have any doubt then please feel free to ask me. Oct 17, 2019 · I have a Combobox in WPF and I am using MVVM pattern. The SelectionChangeCommitted event is raised only when the user changes the combo box selection, and you can create a handler for this event to provide special handling for the ComboBox when the user changes the selected item in the list. EDIT 1: Code Apr 9, 2013 · I am using WPF and has a combobox which is editable. SelectedItem = 2ndItem. SelectionChanged += cboDisplay_SelectionChanged; line into the Loaded even of WPF Combo box not calling setter method when item changed. upgrade) "SelectionChanged" is raised (with "null" SelectedItem!) also when I exit by cell A ComboBox that appears via a template in a ListBox will raise the SelectionChanged event of that ListBox - even if the user didn't select a new ListBoxItem. Then in the form's Loaded event, which itself fires after the completion of loading, you attach the SelectionChanged event of the combo box to the event handler. d May 2, 2020 · Just bind the ComboBox's SelectedItem property to a SelectedRole property in your view model. Enough talking: let's build a small Dec 29, 2011 · Bind the ItemsSource and SelectedItem properties of the ComboBox to properties in your ViewModel: In MainViewModel. what happens now is, when I set the original datasource, the logic for selection is executed due to SelectionChanged event being fired on load. But this didn't work properly. Aug 22, 2011 · What happens is the modal window opens but the selected item is not reflected in the combobox. But what I want is to make ComboBox not fire an event when I set the SelectedIndex property programatically. For instance, I can click and choose first listed item (if lucky), otherwise ComboBox dropdown (popup) will be closed and SelectionChanged event will not be fired. It worked well. I hooked the SelectionChanged event of said combo box. The problem I noticed with ComboBox is that it doesn't fire SelectionChanged event if placed at the bottom of AddIn for items near to the bottom of Word application. 2 I noticed a strange behavior of the ComboBox when it is into a DataGridTemplateColumn. cs Apr 23, 2011 · The TabControl. it is signaled asynchronously. When you press on the arrow, the list drops down as usual and the Combo Box's SelectionChanged event fires. So any idea, why the below XAML ComboBox is not firing mousedown or selectionItem events. // Some logic here. May 12, 2015 · I want to stop the ComboBox_SelectionChanged event from being fired at the UI loading. I've selected a Platform, and so Releases is populated. When the user selects from the ComboBox's the SelectionChanged handler (in the code behind) updates an Array of ColumnOptionViewModel objects on the MainWindowViewModel with the newest selection. WPF ComboBox SelectionChanged command not firing. But if there's only 1 entry in the dropdown, it fires the event for the first time I select it. e Unlike a Windows form, the WPF combobox is not reflecting the newly selected item when the selectionchanged event is fired. SelectionChanged is the same event as a ComboBox. I wonder why it Feb 25, 2019 · I noticed that the SelectionChanged event fires the first time a selection is made, but not on subsequent selections. Net 4. _mySelectedItem = value; Code-behind solution: If you don't want to use MVVM, you can add use this: <ComboBox SelectionChanged="ComboBox_SelectionChanged" />. Note: SelectionChanged is not an event handler on the WinForms ComboBox, only the WPF ComboBox, so I am editing the question and tags to fix. 2 SelectionChanged Event of WPF comboBox is not firing if it has same items in it. Jul 4, 2018 · I've found this works great for the TextChanged event in particular, but it does not work with the SelectionChanged event, likely due to the ambiguity between the ComboBox's SelectionChanged event and the TextBox's SelectionChanged event. SelectionChanged += My_SelectionChanged; } } } Then set up your custom SelectionChanged event handler to whatever you need: private void My_SelectionChanged(object sender, SelectionChangedEventArgs e) { // Your event code here Hi, there I have a WPF application, where I use a ComboBox. SelectedItems // New selection (same as old) ); comboBox Jan 15, 2023 · In WPF, there is no specific event or flag to detect if an input comes from a user or not. Hope, my requirement is clear. Nov 28, 2018 · I am trying to call method by linking it to the Selection changed event and DropDownClosed event of the Combobox in WPF but when i change the item in combobox it is not calling the function it suppose to (in my case OnMyComboBoxChanged1 and OnMyComboBoxChanged2). we have to stop the selectionChanged event from executing while windows is being loaded. ItemContainerStyle. Even better would be to bind the Apr 2, 2019 · List String Item Source. As Clemens says, use a different event and handle things yourself if you want to record something that isn't a change of the selected item. The combobox selected item is also bound to my view model. Is there a way to do it? I am using . WriteLine(y); } to get the row. So, if you do not mark your event as handled in your event handler, it will bubble up the tree, and eventually arrive at your TabControl, which is causing this "firing too often" issue. Oct 24, 2013 · I am new to WPF. Oct 26, 2018 · I am having trouble with the SelectionChanged event trigger for a combobox on my data grid. CellEditingTemplate. I don't understand why event is not triggered just here. This sounds more like a "SelectionChanging" event, than a SelectionChanged event. So simply add the cboDisplay. SelectedItems, // Old selection comboBox. Jun 6, 2013 · I had to resort to a transparent button overlaying the ComboBox (but not its drop down arrow). . To do this, I have written the follow Jul 8, 2015 · @canton7 SelectionChanged Event is not firing when I select the same Item again,To get rid of this thing I added a Button Inside the Itemtemplate But button command is not executed when click I the Item, but if I click the corners of the item means Its Executing the command – Feb 17, 2011 · Thank you HCL for the response. Jan 29, 2020 · I am not binding to a SelectedIndexValue as you can see in the code. In order to run an async action when the view model property changes, just attach an async PropertyChanged event handler in the view model: Nov 17, 2016 · In my wpf application combo box SelectionChanged event firing on binding time, how to fix it? <telerik:RadComboBox StaysOpenOnEdit="True" IsSynchronizedWithCurrentItem="True" Dec 24, 2009 · the 'All' option on a PREVIOUS ComboBox, after the expected behavior (other comboboxes are disabled), when I select an option other than 'ALL', the SelectionChanged event is triggered for EVERY COMBOBOX that was filled previously! (all that were disabled). I have found this Issue in your system: https://www. e newlyslected. Apr 25, 2013 · Its not a bug, SelectedChanged does exactly what it should, it fires when the Selection changes, if the same element is selected it has not changed so it does not fire. 2) Select an item. I have a ComboBox on my MainWindow. NET Framework 4. What i did, is to create a behavior that will associate with the DropDownClosed event, but i don't know how to trigger the SelectionChanged event. However, depending on how the ComboBox is configured, and how the user changes the selected item May 15, 2018 · After upgrade to . e. Visible = false. The SelectionChanged event does not fire for any of the ComboBoxes in the ListBox. Oct 19, 2022 · You can manually trigger the SelectionChanged event of a ComboBox by creating and raising a new SelectionChangedEventArgs in your code. Please help me to get this working properly. Sep 16, 2010 · In the ComboBox SelectionChanged event, I tried to set ComboBox. 5. May 15, 2020 · I have a comboBox, user controls and a button. Is it possible to do something similar for that specific event? – Aug 5, 2019 · So when the form loads, the SelectionChanged event does not get triggered. I'm not sure where you would look for an example but Karl Shifflet and Josh Smith are the two main blogs I go to for MVVM help the links to their blogs are below. The DataContext for the list is a ReadonlyCollection. 2. Sep 14, 2011 · The problem is that WPF sometimes places the SelectionChanged event (or alternatively the SelectedIndex property change notification) on the dispatcher queue; i. When I change the combobox selected item, a delegate command on the view model is fired which goes off and updates etc. Then, there is no way to "plug in" a marker that my own code triggered the change. People have reported the same behavior when using : - combobox inside a column - listview inside a column - etc. Mar 23, 2017 · In WPF, I want to programmatically raise a SelectionChanged event on a ComboBox. Mar 6, 2017 · How to achieve this? I tried to set mouse/keyboard event handler on Combobox, but it only works on the combobox's textbox, not in the dropdown list. it will execute the logic in your SelectionChanged event, probably unnecessarily, increasing startup/rendering time. However, if I examine the value of the combo box in the event handler, it has the old value. Before upgrade, event "SelectionChanged" was raised only when I change the SelectedItem, but now (after 4. Thanks. Equals(currentlySelected)). When the combobox item selection is changed, it fires an event that does a few things. In a WPF Project I have some restyled DataGridColumnHeaders of a DataGrid which show a ComboBox for each DataGridColumnHeader. I need to save (to a db), when the user clicks a button, each row in the ListBox where the user has selected an item from the ComboBox. ### Just to clarify, if it isn't yet. 1) Start with no selections. Hot Network Questions Can inflation be negative? Oct 30, 2015 · Handling a ComboBox Selection using WPF,MVVM, and the SelectionChanged Event Hot Network Questions If you exile a Dryad Arbor with Hazel's Brewmaster can all your foods tap for a green mana? Nov 3, 2017 · private void chessGrid_SelectionChanged(object sender, SelectionChangedEventArgs e) { y = chessGrid. I get the datasource, I set the dropdown with default "select". May 17, 2018 · But, the SelectionChanged event does not fires for the combobox. SelectionChanged += cbEntry_SelectionChanged;. SelectionChanged gets fired. SelectionChanged event is not firing in my UI App but when I copy the same combobox code in a different WPF app, selectionChanged event is firing. 0 cb. I want the combobox selectionChanged command firing when clicking the combobox item or check/uncheck the checkbox before it. When you click anywhere else on the Combo Box the transparent button's click event fires allowing you to re-select the Combo Box's current value. I also tried: Jun 3, 2015 · The problem I noticed with ComboBox is that it doesn't fire SelectionChanged event if placed at the bottom of AddIn for items near to the bottom of Word application. So at page load I set the SelectedValue and the SelectionChanged event fires which is not what I want Feb 15, 2013 · The setter is not firing on a ComboBox value change whatsoever. SelectionChangedEvent, comboBox. In my SelectionChanged event as you can see I notify other objects to be loaded with data relating to the selected item. I only want this to happen when one is selected but not a default one to be set. I tried putting the code in the SelectionChanged event and it didn't work, the reason I think is because it gets to the code inside the comboBoxSelection event after the event is fired, by that time data is already loaded,so it moves on and executes the code. xaml. Here’s a concise example: // Assuming 'comboBox' is your ComboBox control var args = new SelectionChangedEventArgs( ComboBox. RaiseEvent(new RoutedEventArgs(ComboBox. I am trying to bind collection of string to combobox. It originates from Selector. SelectionChanged. I've tried the following code but it doesn't work: myComboBox. SelectionChanged += comboBox_SelectionChanged; The above assumes that there is a handler method like. May 4, 2010 · If I have a ComboBox that has a SelectionChanged event, it fires when I'm loading the control. I had to change the Enum property to an int property to avoid the selectionchanged even firing on scroll. I tried another approach which set the event in ComboBox. In a majority of the cases you do not want this to happen because, 1. After that, if I select it again , it won't call the SelectionChanged Event. Oct 18, 2011 · <ComboBox ItemsSource="{Binding CompetitorBrands}" DisplayMemberPath="Value" SelectedValuePath="Key" SelectedValue="{Binding Path=CompMfgBrandID, Mode=TwoWay, UpdateSourceTrigger=Explicit}" //to indicate that you will call UpdateSource() manually to get the property "CompMfgBrandID" udpated SelectionChanged="ComboBox_SelectionChanged" //To fire Dec 11, 2015 · The problem is I am not getting Mouse selection on a any comboboxitem is not getting fired. But this is not what i need. well i would have used the SelectionChangeCommitted in a Winform, i am not finding an equivalent in this case. – Rob Commented Mar 6, 2012 at 19:05 Dec 6, 2020 · private void MyComboBoxColumn_SelectionChanged(object sender, SelectionChangedEventArgs e) { ComboBox comboBox = (ComboBox)sender; var selectedVal = comboBox. You may have to handle this with one of the MouseEvents on your Item or the ListBox itself Mar 6, 2014 · Internally the ComboBox will only raise a SelectionChanged event if the selection actually changed, that's why you're not seeing that event. It should happen only when the user makes some change in the combo box. Dec 29, 2011 · This is very bad, dont use it, any code run in property setter will be run on main thread that mean it will block the app until it is done and if it is long it will be blocking the UI, just put a sleep in // Some logic here and see what happens, use only events, they wont block changing combo selection, the are fire and forget. But from key board, keydown event is getting fired and works perfectly well. Regards, ani Jan 6, 2012 · The ListBox and ComboBox are populated from 2 different ObservableCollection from the ViewModel. Here is the xmal: <Co New to WPF. private void comboBox_SelectionChanged(object sender, SelectionChangedEventArgs e) { Aug 26, 2019 · Hi, I have an Issue with the event SelectionChanged of the ComboBox, it does not fire. I'm also changing the collections from code-behind and do not want the code in the SelectionChanged event to be triggered then. 3) Select more items. Aug 22, 2018 · In my case it was due to an Enum property exposed to the datagrid. So doubting that some issue with VisualTree updates. Aug 4, 2018 · When you set the combo-box to a default value, the SelectionChanged event is fired. You can avoid this problem by attaching the event handler in code behind instead of XAML, after InitializeComponent: cbEntry. ToString(); } wpf datagrid Mar 19, 2014 · Then you could use a binding your View Model to the combo box SelectionChanged. The funny thing is that, once I inspect the visual tree (GridCell and my ComoboBox) using WPF-Inspector, the SelectionChanged event fires. i. Edit: Aug 27, 2020 · The SelectionChanged event is fired during the execution of the InitializeComponent method - while the TextBlocks have not yet been created. If you put that ListBox in a TabControl, then the SelectionChanged on that TabControl will also be fired - even if the user didn't select a new TabItem. regards, Vimal I have implemented DataGridView1. Nov 22, 2019 · I have a ComboBox,and I define its ItemTemplate. WPF ComboBox SelectionChanged event to command not firing. SelectedValue. I have managed to figure it out using either CallMethodAction or InvokeCommandAction with the resources: Apr 4, 2015 · You would have to attach a SelectionChanged event handler like this: var comboBox = new ComboBox { }; comboBox. cmtsrp noijc fuu ownhz lik zyrdp ygkhyceh nooex hvnp qevjbb