It has to do with how SelectedValue updates its internals. My XAML for the ComboBox looks like this. -VendorID (SelectedValuePath) is supposed to be a public property of the VendorDetail I have a listview, when selecting the listview I make a binding to an SelectedCategory property. WPF Combobox binding and SelectedValue with SelectedValuePath, Stop requiring only one assertion per unit test: Multiple assertions are fine, Going from engineer to entrepreneur takes more than just good code (Ep. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. So if you don't manually select a value from the Combo box control, the ComboBox1.Selectd formula would return empty. July 15, 2021 In combobox, mvvm, wpf 18 Comments Update After a bit of investigating. I guess I'm missing something here and I hope someone can help me out. Find centralized, trusted content and collaborate around the technologies you use most. private void DeleteButton_Click (object sender, RoutedEventArgs e) { <ComboBox x:Name="cmbService" DisplayMemberPath="Name" ItemsSource="{Binding DataServer}" SelectedValuePath="IsCustomAvailable"/> In other words, the user does not interacts with the control. Now if the user says he want to be able to see all the available Titles in a ListBox rather than the ComboBox all you would need to do is change the GUI. First add the following code to the View IsSynchronizedWithCurrentItem=True. The following image is from the watch window after setting cboGridSize.SelectedIndex to 0. How to define 'Attached property' as 'SelectedValuePath' in ComboBox? But I knew I was missing some element of this and glad it was finally supplied. What is the purpose of setting the SelectedValuePath? Thanks for supplying the missing piece. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Is there an industry-specific reason that many characters in martial arts anime announce the name of their attacks? 503), Mobile app infrastructure being decommissioned, ComboBox.SelectedValue not updating from binding source, WPF MVVM ComboBox SelectedItem or SelectedValue not working, WPF Combobox selectedvalue not updating when update selecteditem, Linq-to-sql Null value not displayed in combobox bound to FK, Combobox.SelectedValue wont select the actual value. 503), Mobile app infrastructure being decommissioned. Connect and share knowledge within a single location that is structured and easy to search. Stack Overflow for Teams is moving to its own domain! -VendorDetails is supposed to be a property of the DataContext (view model) of the UserControl that returns an IEnumerable Retrieve the string value of a WPF ComboBoxs selected item in the code behind, A planet you can take off from, but never land back, Cannot Delete Files As sudo: Permission Denied, Movie about scientist trying to find evidence of soul. I thought it was something so simple! ComboBox is filled in this part of the code: List<CategoryDTO> categories = new List<CategoryDTO>(); for (Int32 index = 0; index < response. So, you should re-write your code as follows: This does not answer the OP howeverthe ComboBox SelectedValue must be an integer type. If you navigate to a new instance of that page it constructor will be called again. Solution 1. What are some tips to improve this product photo? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. What's the proper way to extend wiring into a replacement panelboard? Without the double equal sign, comboBox1.SelectedValue will be set to null. QGIS - approach for automatically rotating layout window, Handling unprepared students as a Teaching Assistant, Steady state heat equation/Laplace's equation special geometry. Remember that my Brush-Property in the ViewModel now has to be of Type EqualityBrush! 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. This is my Xaml Code: What seems to be the issue is that the SelectedValue/SelectedItem is occurring before the Item source is finished loading. Connect and share knowledge within a single location that is structured and easy to search. In the CategoryViewModel I have made an property SelectedCategory. Don't know how I'm going to get around this one. Required fields are marked *. }. It's actually easier to use a collection view rather than dealing with the GUI control directly. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Stack Overflow for Teams is moving to its own domain! I have an application using in WPF using MVVM with a ComboBox. What we found was if you set SelectedValue it would not see the change we had to instead set SelectedItem which would properly update every thing. My conclusion is that SelectedValue is designed for get operations and not set. The first combobox will list database instance names. Since I am having issues with the first, database instances, combobox I will only show my code for that. Why does sending via a UdpClient cause subsequent receiving to fail? What seems to be the issue is that the SelectedValue/SelectedItem is occurring before the Item source is finished loading. And because the ComboBox IsSyncronizedWithCurrent property is true by default, the SelectedItem and SelectedValue properties are reset. Why are there contradicting price diagrams for the same ETF? To select an item initially you should set the SelectedDBInstance property to an item that is present in the DBInstances collection: Thanks for contributing an answer to Stack Overflow! I do not know why and it is seems wasteful to me. But the Selected property and the SelectedItems property of the Combo box control is used to list the selected items resulting from user interaction. As far as comboBox2 not being reset, I'm not sure. Because you are already binding to SelectedItem. My profession is written "Unemployed" on my passport. As you can see, I have the ValueMember property set. Making statements based on opinion; back them up with references or personal experience. When the application starts up the combobox is loaded and the first item is selected, as expected. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Can you post an example? Stop requiring only one assertion per unit test: Multiple assertions are fine, Going from engineer to entrepreneur takes more than just good code (Ep. Knowing this, I may not take the approach you suggest. One possible solution is: Based on the selected item id, recover the object on the itemsource collection and set the selected item property to with it. Stack Overflow for Teams is moving to its own domain! { Can an adult sue someone who violated them as a child? End Update I have an application using in WPF using MVVM with a ComboBox. I have a very simply answer for this problem. Dont know how Im going to get around this one. Based on the selected item id, recover the object on the itemsource collection and set the selected item property to with it. Q&A for work. Use an integer. I have noticed this behavior before as well. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. If for example the type of SelectedValuePath is Int16 and the type of the property that binds to SelectedValue is int it will not work. If I sit in a break point and wait a few seconds it works as expected. It turned out that when I added a check to make sure the proposed value for KeyType was not null, everything worked as expected. The hierarchical inheritance of ComboBox class is as follows . To learn more, see our tips on writing great answers. The object is returning the correct object via the get in the property though. Why are UK Prime Ministers educated at Oxford, not Cambridge? I solved the problem by adding dispatcher in UserControl_Loaded event. For the SelectedItem and SelectedValue bindings, I do not set a mode - this is because "Mode=TwoWay" is the default. WPF Combobox with DisplayValue and SelectValue not working correctly. So i wrote a class EqualityBrush containing a Brush and implementing Equals: Using a List of my new EqualityBrush class instead of normal Brush class fixed the problem! By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. This caused everything to break. The issue is when I select a new name my method that I expect to get called does not. Binding Value. The list in the listview is of Category and here I have a key of ProjectId and a key of ProjectName. It binds two way by default, so if the property binded to it(SelectInfo) is null, it will also be set to null. Here is my Model code. I spend hours to find that, and thats why I am answering here after so much time the question was asked. I know this is an old question but I've just come across this problem myself. Solution 4. I have this class I'm using in Entity Framework: public VendorDetail() I may just do a simple lookup on my own. So change SelectedItem to SelectedValue and make sure that PartsListsSource has a public property of type long called "VendorID". If you have a short or byte var that holds the value that will set the SelectedValue, it won't work - you will have null/nothing value. When an item is selected from the dropdown list, this is the property used to get the value to set the SelectedItem value to. Share Improve this answer Follow answered Jun 16, 2020 at 15:53 Nathan Evans 121 1 3 Add a comment 0 I was just trying everything I saw. For the sake of this example lets say MyObject has two properties (Text and Id). Can an adult sue someone who violated them as a child? However, you always return a collection of new objects from Languages, so when the selection changes, you set ComboBox.ItemsSource to a new collection which does not contain the object that was just selected. If you have a short or byte var that holds the value that will set the SelectedValue, it won't work - you will have null/nothing value. 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. To select an item initially you should set the SelectedDBInstance property to an item that is present in the DBInstances collection: That did the trick. 2,674 2 23 53 Add a comment 3 Because you are already binding to SelectedItem. In order to create a MultiSelect Combo Box ,we must analyze what is required to construct such a control. Find centralized, trusted content and collaborate around the technologies you use most. -VendorID (SelectedValue) is supposed to be a long property of the collection of the PartsListsSource that your DataGrid is bound to. A shortcut for you would be to override the Equals operator on MyObject so that when comparing two MyObjects, the actual Id properties are compared. So change SelectedItem to Selected Value and make sure that PartsListsSource has a public property of type long called "VendorID". the remaining comboboxes will be populated after the button is clicked. Is this homebrew Nystul's Magic Mask spell balanced? I solved with the following - it's slightly hacky but it works: u can set SelectedValue first, and then set Datasource and others. SelectedValue - is bound using a property binding of " {Binding ColorString} ". Where to find hikes accessible in November and reachable by public transport from Denver? The content you requested has been removed. Don't know how I'm going to get around this one. The Itemssource (ObservableCollection) binds fine, But When you select An Item it never even calls the bind (I place a Break point at the get statement and it never triggers). No matter which way I configure this when I come back to the page and the object is reassembled the ComboBox will not select the value. Now if I can find a way to make it AutoComplete, it would be great! This will result in only the Loaded event being fired when navigating back to a page you have already visited. Were sorry. WPF will not register a click on a completely transparent part of an element. Can you say that you reject the null at the 95% level? This forum has migrated to Microsoft Q&A. Counting from the 21st century forward, what is the last place on Earth that will get to experience a total solar eclipse? Does a beard adversely affect playing the violin or viola? Why 'SelectedIndex=0' is not working? Not the answer you're looking for? In my case I was using in complex type (List) as the Item Source and was using a KeyType as the selected value. When leaving the current page, the CollectionView associated with the ItemsSource property of the ComboBox is purged. XAML. What's the proper way to extend wiring into a replacement panelboard? I have created a WPF for that has multiple comboboxes and a button. 24 May 2021 9 minutes to read. Would a bicycle pump work underwater, with its air-input being above water? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Why should you not leave the inputs of unused gates floating with 74LS series logic? I am using a ComboBox control in a WPF UserControl. What is rate of emission of heat from a body in space? Setting the SelectedIndex to -1 should do that. Your email address will not be published. Your email address will not be published. RelativeSource={RelativeSource AncestorType=UserControl}, Path=DataContext.VendorDetails}" public string Address { get; set; } Header="Vendor Part No" Width="SizeToHeader" /> This section explains how to create a WPF DoubleTextBox control and its features. You need to put the ItemsSource property BEFORE the SelectedItem property. Margin="13,370,107,185" Grid.Row="1" 503), Mobile app infrastructure being decommissioned, WPF ComboBox Items in UserControl size not updated, WPF Binding Collection To ComboBox and Selecting an item, WPF MVVM ComboBox SelectedItem or SelectedValue not working. telerik multiselect combobox wpf . I have a WinForms application. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. You can fix this by assigning the SelectedItem in your Viewmodel constructor. As others suggested above, if you use SelectedValue instead by binding to an int property on the viewmodel, it will work. The thing is. I have tried : using SelectedItem doesn't help Replace first 7 lines of one file with content of another file. Will it have a bad influence on getting a student visa? 1) I create and add a combobox to a visual container (usualy Grid) by runtime or it is defined in the XAML page 2) I assign combobox source to the new xmldocument, this loads the content and then document xml data populate the combo items 3) When page init is finished i load page data to setup the form, I set loaded comboboxes to the . I've populated my ComboBox with the following code: However, the last line has absolutely no effect. Thanks for contributing an answer to Stack Overflow! It contains well explained topics and articles. The fact that all of this works fine when using the combobox outside of a DataGridTemplateColumn, but not inside the DataGrid is what is confusing to me. When you write simple code like below then it is also not work because type of value is diffent we have set value 1 but it is comparing it with type comboboxitem:1 so it is not getting selected. Did the words "come" and "home" historically rhyme? Will Nondetection prevent an Alarm spell from triggering? Here is my XAML for the database instances combobox. What is the rationale of climate activists pouring soup on Van Gogh paintings of sunflowers? Change the border's background to #FFFFFFFF and the selection will start working. Visit Microsoft Q&A to post new questions. DisplayMemberPath="VendorName" Not the answer you're looking for? Why was video, audio and picture compression the poorest when storage space was the costliest? UPDATE. Can lead-acid batteries be stored by removing the liquid from them? Connect and share knowledge within a single location that is structured and easy to search. The selected item has to be considered equal to an item in the collection. SelectedValuePath="VendorID" It could be the way you are applying the DataContext to the Page. rev2022.11.7.43014. Maybe another poor guy like me with the same problem can see it. public long VendorID { get; set; } Your code would remain the same as it would not ever (and I repeat ever) need to reference the control that the information was presented in. What about changing SelectedValue to SelectedItem? Please remember to close your threads by marking helpful posts as answer and then start a new thread if you have a new question. Basically you should create a list of options (or objects representing options) and set them as ItemsSource, this way your SelectedItem will be exactly the option which is selected, not the automatically created wrapping ComboboxItem. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Strathmore Mini Storage > Blog > Uncategorized > telerik multiselect combobox wpf. RowDetailsVisibilityMode="VisibleWhenSelected"> Try removing the SelectedValuePath and see what happens. If this in itself doesnt fix it, then you will be able to manually raise the PropertyChanged event yourself when navigating back to the page, and that should be enough to get WPF to redraw itself and show the correct selected item. but it's just a palliative solution as it's not working as it should. -VendorID (Selected Value) is supposed to be a long property of the collection of the PartsListsSource that your DataGrid is bound to. . Can someone help me to understand why my method public DBInstance SelectedDBInstance is not getting executed when I have this in my XAML, SelectedValue="{Binding SelectedDBInstance, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}? Assigning a number as a value Combo_IDMaschine.SelectedValue = 123; Code Example: None of the sub elements would get updated when the key changed. I tried that and it did not work for me. In order to avoid that use the KeepAlive property of your pages. I want to select [0] value to default at first time, but it just empty box at run time. public string VendorName { get; set; } Sci-Fi Book With Cover Of A Person Driving A Ship Saying "Look Ma, No Hands! As well as the fact that the binding seems to work fine one way (importing the value of "ConnectionT" into the ComboBox, but not updating the ToolObj when changing selection of the ComboBox) November 4, 2022 lil baby and lil durk tour dates 2022 0 Likes. After a bit of investigating. If you can restructure your ViewModel to expose the index of the selected item, and bind to that, you should be good to go. Nothing seems to work. Can anyone see what I have wrong? I spent a lot of my time searching for answers, but I couldnt find. This does not answer the OP however.the ComboBox SelectedValue must be an integer type. C# : WinForms : ComboBox : DropDown style : SelectedItem + SelectedIndex is not set correctly : bug? Why are taxiway and runway centerline lights off center? Next when ever you assign a new object in the ViewModel to that Property SelectedObject should be saved to that Property and not the private member. 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.
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