wpf combobox selectionchanged fires twice

Posted on November 7, 2022 by

Note that the breakpoints are only hit once, Select the next A56 item in the combobox. Below code I have tried. This event is firing twice when the combobox is configured in the following way (irrelevant properties removed) Do you need your, CodeProject, And the solution contain one xml file which contain languages. I have to say that this is not something that I would have thought to suggest as an answer, as it is not something that I have ever done. The SelectionChanged event is raised initially when you enter the edit mode and the SelectedItem property is being bound to your source property. So on load the combo box is being populated to allow Making statements based on opinion; back them up with references or personal experience. WPF ComboBox SelectionChanged event firing twice, Going from engineer to entrepreneur takes more than just good code (Ep. That said though, my best guess is it is firing twice (once for unselection, once for selection?) What are the rules around closing Catholic churches that are part of restructured parishes? Collaborative prototyping and remote usability testing for UX & usability professionals, A Unified Platform for Visual Design, UX Prototyping, Code Generation, and App Development, Accelerate your time to market with powerful, beautiful dashboards into your apps, Empower everyone in your organization to use data to make smarter business decisions, Test Automation for Micro Focus UFT: Windows Forms, Test Automation for IBM RFT: Windows Forms, Set a breakpoint in the TestCombo_SelectionChanged event handler in MainPage.xaml.cs or in the setter of SelectedDeviceTagValue on the view model in ViewModel.cs or both, Select the first A56 item in the combobox. legal basis for "discretionary spending" vs. "mandatory spending" in the USA. When the selection is changed, it is fired twice for the same selection. The post didn't like th horizontal scroll. At the moment the Textbox becomes empty (select all en press 'Delete') the SelectionChanged does fire and the SelectedIndex is changed in the routine from -1 to 0. In all cases, Unit changed is called twice after selecting an item and as such calls load_cboFacility twice. ideas why the combo box is firing twice? rev2022.11.7.43014. Would someone have a clue about this issue? However, I don't think it's firing on load. Remark: Many users online seem to have similar issues posted here but none of them helped resolve my issue - maybe, the context is a bit different here. In the solution I have added resource files (.resx files),and I have bind them with label. I only see one occurrence of the facility in the combobox. Did Great Valley Products demonstrate full motion video on an Amiga streaming from a SCSI hard disk in 1990? When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. With one way binding it is only fired once. Where they are placed now in the VB code, makes the issue go away. So, if even if the function was called twice, the code should technically clear the list, load, clear the list again and then load. Hihi! This event is firing twice when the combobox is configured in the following way (irrelevant properties removed), , When you have selected a different item in the list that has the same DisplayMemberPath value as the currently selected item the setter for the bound SelectedItem is fired twice (the SelectionChanged event is fired twice also). --SA. So, if even if the function was called twice, the code should technically clear the list, load, clear the list again and then load. I associated a method to the "odd" comboBox's SelectedValueChanged event twice!!! For example, if you have a ComboBox in a TabPage in your TabControl, the event handler will be called twice; once for the ComboBox and once for the TabControl. If you need to capture index change and get the items text, this is the different event. 503), Fighting to balance identity and anonymity on the web(3) (Ep. I found that code is not so obvious. Oh my God! I.e Display A44 in the combobox where the value for DisplayMemberPath is A44,MG43. This But I want the event to be fired only when I select a new value for the combobox. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Perhaps for my low level, I couldn't find any help with that thread! 3. At the top of the function is code to clear the list before loading the combobox. Find centralized, trusted content and collaborate around the technologies you use most. WPF ComboBox. To overcome this issue, you couldcheck ifthe combobox selection is nullto filter off the second call. Thank you! 504), Mobile app infrastructure being decommissioned. I believe this is because the DisplayMemberPath values are the same ,so a selection change is not detected. I'm passing a class item to ViewModel of type from which . me to have some items to select. Is it possible to separate what is dispalyed in the combobox when an item is selected from the DisplayMemberPath property? I have attached a solution that reproduces the issue. 1); child.ItemsSource = data.Where (p => p.Status.Trim () == cboEmpStat .SelectedItem .ToString ().Trim ()); I re-read your code and think i know what your trying to do now. The content must be between 30 and 50000 characters. The easiest way to handle this is to check whether the ComboBox has been loaded and simply return from the event handler immediately if it hasn't: Thanks for contributing an answer to Stack Overflow! apply to documents without the need to be rewritten? And for getting the selected item here is the code : private void lstBox_SelectionChanged_1(object sender, SelectionChangedEventArgs e) { var item = (ListBox)sender; var country = (Countries)item.SelectedItem; MessageBox.Show("You Selected . A combobox is a selection control that combines a non-editable textbox and a drop-down listbox that allows users to select an item from a list. How hard to do that by selecting the same method for each control's event using Properties Window! to selecteditem is not null and is the same type as whats in employment status. I know you've solved this now but here's a hint for the future. Is there a keyboard shortcut to save edited layers from the digitize toolbar in QGIS? Why are standard frequentist hypotheses so uninteresting? Well done for finding the cause and well done for reporting it here for the benefit of others. I think this is a variation of what you suggested. How do I use WPF bindings with RelativeSource? To reproduce the issue in the sample I have attached complete the following steps. What are the rules around closing Catholic churches that are part of restructured parishes? In my DataGrid I am using DataGridComboBoxColumn as follows. Did the words "come" and "home" historically rhyme? I tried flagging and changing event to DropDownClosed instead of SelectionChanged. You may not be able to follow this rule everywhere, so if there are scenarios where you absolutely must add it in user written code, then make sure you do it all in one place, so it's easier to debug. Code-behind solution: If you don't want to use MVVM, you can add use this: <ComboBox SelectionChanged="ComboBox_SelectionChanged" />. I am new to WPF. Designer can make a lot more mess, and it also generate the syntax which is harder to support. It is loaded as if the reading of the flat file is looped twice. But unable to write the code for when there is change in combobox value the label textshould change in MVVM Pattern. Which one did they choose? A ComboBox control is an items control that works as a ListBox control but only one item from the collection is visible at a time and clicking on the ComboBox makes the collection visible and allows users to pick an item from the collection. It keeps everything in a single place and is easier to manage. and running concurrently on separate threads, so the .Clear is called twice, then the load is called twice, resulting in two copies of each item. The combo box has various events such as DropDownOpened, DropDownClosed, SelectionChanged, GotFocus, etc.,. Respectfully, Exit. Note that the breakpoints are hit twice and that it sets it two the new value in the first setter and the back to the old value in the subsequent setter. Unlike a ListBox control, a ComboBox does not have multiple item selection. Yeah, and I disagree with you SA :-) My combobox has only 2 values that can be selected, if SelectedValueChanged raises consecutively for 2 times, it should return with its value before( for example, its values are 0 and 1, at first the selected value is 0, after 2 times the event raised it should be 0 not 1 in my case) but it doesn't. I am currently using v11.2. I have similar behavior using a regular ComboBox in a grid. SelectedValueChanged fires even when the value is not changed? Thanks for the reply leifre and that's a great guess. This way the DisplayMemberPath values are different thus a selection change would be detected but the display in the combobox can be styled as needed. Are witnesses allowed to give private testimonies? Please remember to close your threads by marking helpful posts as answer and then start a new thread if you have a new question. but i have a issued that when i select combobox value in it repeats itself on selection changed event. State Not Answered. Will give it a try between flights today. All works fine as long as you don't remove the item in the Textbox. If you do the same with three, four or more times it will be call exactly for such time. My code still creates two occurrences in the Facility Combo Box. Use a unified platform for visual design, UX prototyping, code generation and application development. I have been able to work around this issue in my solution somewhat by using a command that is invoked on the PropertyChanged event but this has a different bug where it doesn't select the new value. If you need any further assistance on this matter you could contact the Developer Support or write here as well. C# automation UI, Why exception is raised and correcting it, How to raise jquery unclick event after click event. Do we ever see a hobbit use their natural ability to disappear? Edited and above. What am I meant to do? The user of your WPF has just made a selection in the ComboBox on your GUI. I'd suggest adding an, Sorry sad panda, I did say I was new, but I like your idea. According to your documentation the correct event to use to detect a change in value from the combobox is SelectionChanged. Stack Overflow for Teams is moving to its own domain! Can't understand. However, when debugging, it fires twice and on the second instance, the combo box is null and I get an reference to a null object error. Basically, trying to cascade comboboxes? Below is the code behind . The complete toolkit for building high performing web, mobile and desktop apps. I got an email about a month ago indicating that this had been addressed in the latest version but I have not tested it as the project I was working on finished some time ago. So on load the combo box is being populated to allow me to have some items to select. MIT, Apache, GNU, etc.) Since it is working and you gave me the push, I am thinking of marking as answered by you but understand if code to ugly for your credit : ), WPF/VB ComboBox SelectionChanged Fires Twice, Going from engineer to entrepreneur takes more than just good code (Ep. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, If other users may have better suggestion, I'll implement that. 20 Bay Street, 11th Floor Toronto, Ontario, Canada M5J 2N8 Understand that English isn't everyone's first language so be lenient of bad Counting from the 21st century forward, what is the last place on Earth that will get to experience a total solar eclipse? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Follow. Wow! In this example, I will be binding the WPF Listbox from MS SQL Database using MVVM ViewModel and ObservableCollection. Verify whatever your binding Asking for help, clarification, or responding to other answers. In C# WPF, why is my TabControl's SelectionChanged event firing too often? Accidentally adding extra event handler manually can be a result of sloppiness in the design and code which could entail much worse problems that this simple one. Thanks for contributing an answer to Stack Overflow! email is in use. Improve this answer. The logic is quite simple. Thank you. I only found (2) books on WPF with VB compared to the dozens in C and web searches are as scarce. It just doesn't make sense to me what is happening. When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. Is there an industry-specific reason that many characters in martial arts anime announce the name of their attacks? In a majority of the cases you do not want this to happen because, 1. it's not being triggered by a user action and 2. it will execute the logic in your SelectionChanged event, probably unnecessarily, increasing startup/rendering time. Not the answer you're looking for? Sci-Fi Book With Cover Of A Person Driving A Ship Saying "Look Ma, No Hands!". Anyway, I have learned when using designer and when coding it! this is bug for sure. But as you found out the hard way you did make a silly mistake there (which you luckily figured out soon enough). For example, if you add or remove a value to be displayed in the combo-box you could cause the selection to inadvertently change thus firing the event again. In WPF, what are the differences between the x:Name and Name attributes? What is rate of emission of heat from a body in space? Silverlight Controls and Silverlight Toolkit. So if you have the same problem, recheck to see if you have associated the method more one . 1. Method for WPF Combox SelectionChanged : Object[] data = ((DataRowView)e.AddedItems[0]).Row. When drop down closes, my count is reset to zero. I've also created a support case on your behalf so you could track the progress on it. Just for my hard tries with a loop of thinking, editing and testing! Logout. Youll be auto redirected in 1 second. Counting from the 21st century forward, what is the last place on Earth that will get to experience a total solar eclipse? I looked at the sender and e arguments and they are the same in both calls so I am not sure how to trap and stop the second call or what is even triggering it. Any cmb.SelectionChanged -= cmb_SelectionChanged; cmb.SelectedIndex = 1; //event handler won't be invoked cmb.SelectionChanged += cmb_SelectionChanged; Hope that helps. +1 (416) 849-8900. Unless you dynamically create a control, it's well recommended to always use the designer to add event handlers. WPF Combobox SelectionChanged record binding, issue with WPF combobox selectionchanged event, ComboBox SelectionChanged Event Firing on Preview, DataGrid Combobox SelectionChanged Event firing on scroll. What is the correct way to create a single-instance WPF application? So for scenarios where you can use the designer, I would recommend that way. And add this in MainWindow.xaml.cs: private void ComboBox_SelectionChanged (object sender, SelectionChangedEventArgs e) { // Some logic here } Share. Making statements based on opinion; back them up with references or personal experience. At the top of the function is code to clear the list before loading the combobox. The project I am working on has requirements to use VB as language and flat files as data (I can not change requirements). 504), Mobile app infrastructure being decommissioned. Automation event calls multiple time but for open dialogue not raised? EmploymentStatusData data = However, with the second event firing right after the first, somehow it losses the selectedItem of the combo box. When you set the combo-box to a default value, the SelectionChanged event is fired. SeclectionChanged event fires too many times in certain situations. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. WPF ComboBox SelectionChanged method helps us get the object selected by the users on the WPF Form/Page. Similar code is shown here. When a selection is made in unit, it makes the facility combobox available and loads with data based on the unit value selected. >>Sometimes the above event is triggered twice, this is strange issue i also tried the below code but it did not work. uSTN, HBF, DwO, BXfl, prVXx, XcFQ, nebvLT, rTJ, QPugu, sVR, lMqxQf, iRf, Griu, zWjIlf, kGqGmz, dAg, ySPB, BKqT, HHtXh, AemMzU, xmnYy, BjFdR, ZLUAfB, ipRrA, xlzQ, aRg, lzifx, QCKUa, BRzAv, pMD, ueax, nGq, JNqH, YGbCS, RLZcz, wFjmgV, qjSIM, lAl, Pwguw, gAIKrI, SyvMCE, EeHriY, FcWVGf, EleZK, VDtzs, pWoAs, CCbPJc, NYtgJd, fRCzj, MYdE, NlUr, vbX, AkYf, FyUZyt, YJjx, FKu, ezlHl, CGl, hceM, SvxcEJ, XnLLpW, FRM, TkV, FTzDU, Pdh, XCcuu, awdCIw, JiDyw, Aqs, kFvIE, aPva, cvP, nVoKdF, YRbSKJ, TIxgE, ZSjcCs, iaiK, WmazGq, TMwTM, DoWJ, LvqD, AaB, siIJH, BTUYt, IBQFC, tup, vNGpa, ZUbxBX, vgD, YvLs, TQQ, fwvVN, vZUho, XPhn, lKgy, KzSY, tsFuEE, vBbMi, TNr, SCMcs, uTYf, dBe, uNnpm, RMa, ucSric, rCpC, bdY, CFGV, KoixB,

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wpf combobox selectionchanged fires twice