Wpf selectedvalue not updating
We are having an API called “Cascade To” which is used to map the child Dropdown list in the parent Dropdown list control.By selecting an option in the parent dropdown, the child Drop Down List has to load the corresponding value regarding the parent Dropdown.or can you please send me the example with 3 syncfusion dropdownlist with example?As per your requirement we can achieve it by applying “Cascading” support to our Dropdownlist controls or by changing the Data Source of the other Dropdown list by using “On Value Select” server side event of our Dropdownlist control.It does seem more intuitive to take this approach however Data Grid Columns are not actually part of the visual tree and only the Binding DPs will actually be set on generated cell elements to inherit Data Grid’s Data Context.This works because internally when the cell is being generated, the Content of the cell will have its layout updated which will make it part of the visual tree and it will have access to the correct Data Context.In our application we have a combo box that switches between different modes. So, if there are unsaved changes and the user selects new mode in the combo box, we want to Reverting using selection on step 1 makes sense, because the application did not officialy switch modes until the user said "yes", and we want the combo box to correctly reflect current mode. If we use MVVM, we have three entities related to the combo box selection: In an ideal world all three should be synchronized at all times, with possible exception of very brief transition states. NET 3.5, otherwise an MVVM application would never be able to set the selection programmatically.Unfortunately, it turns out that if one uses MVVM and data binding, reverting user seletion in a combo box is difficult in . Unfortunately, the synchronization is broken in different ways in . Roughly, the combo box turns "deaf" to view model updates for the duration of "selection changed" windows message, probably to prevent infinite loops.
Thank you For Reply I saw your example but why there is need to bind data source on pre-render event every i do bind third dropdownlist on value select event of 2nd dropdown do i need to bind datasource to second dropdownlist in pre render event?Sir, I am working with syncfusion Dropdownlist control in c# web i am doing postback on first dropdownlist selected index changed second dropdown get bind but selected value in first dropdown get vanished.please help in this issue.Thanks We are unable to reproduce the issue with maintaining the Drop Down List selected value after post back.Thus, possible work around is to defer the reversal of user selection until after curent windows message is processed via is dispatched and the view model once again signals an update, the combo box sees that the view model state is the same as its internal state and does nothing, still leaving the visual state out of sync.The demo application demonstrates the relationship between the visual state, the combo box object state and the view model state, which varies depending on the .
At this stage, if I run the window, change the contents of the two text boxes the change is reflected back to the member field, which is what I want to happen. Let's get rid of the Combo Box's Data Context: Right, let's fire up this bad boy... I need to include hidden the value say Type Identifier. If you want to email me at my xclave address (top of the page in the 'news' section) then we can see if we can sort it out!