Wpf combobox text not updating define validating

04-Jan-2020 15:11

wpf combobox text not updating-14

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Object Instance = obj1 End Sub Private Sub btn_List2_Click(By Val sender As System. This method uses the Equals method to determine equality.

However, when I click a button to switch the Object Instance to obj2, the Combo Box Items Source gets populated correctly in the dropdown, but the Selected Value is set to Nothing instead of being equal to obj2. Problem: The Combo Box class searches for the specified object by using the Index Of method. took me more than a week to resolve this small fyn.

Add(name) Next _selected Name = default Name End Sub Public Read Only Property My List() As Observable Collection(Of String) Get Return _mylist End Get End Property Public Read Only Property Selected Name() As String Get Return _selected Name End Get End Property End Class Class Window1 Private obj1 As My List Object Private obj2 As My List Object Private odp As Object Data Provider Public Sub New() Initialize Component() Dim namelist1 As New List(Of String) namelist1. Add("Steve") obj1 = New My List Object(namelist1, "Steve") . Find Resource("My List Object"), Object Data Provider) odp. It appears that you have a list of strings and want the binding to just do string matching against the actual item content in the combobox, so if you tell it which property to use for the Selected Value it should work; at least, that worked for me when I ran across this problem. Selected Text Tip: Selected Value is preferred for Combo Style.

Object Instance = obj1 End Sub Private Sub btn_List1_Click(By Val sender As System. It seems like Content would be a sensible default for Selected Value but perhaps it isn't?

What seems to be the issue is that the Selected Value/Selected Item is occurring before the Item source is finished loading.

If I sit in a break point and wait a few seconds it works as expected. End Update I have an application using in WPF using MVVM with a Combo Box. The issue I'm having is when we leave our page and migrate back the Combo Box is not selecting the current Value that is selected.

View Model No matter which way I configure this when I come back to the page and the object is reassembled the Combo Box will not select the value.

The object is returning the correct object via the get in the property though.

wpf combobox text not updating-29

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so if you are setting your Data Context inside your View you will no doubt be blowing away that Selected Item that the user selected.Example: I have noticed this behavior before as well.

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