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Editorial Team
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Asked: 2026-05-13T16:30:02+00:00

Consider the following XAML: <ComboBox Name=CompanyComboBox HorizontalAlignment=Stretch ItemsSource={Binding Path=GlobalData.Companies} SelectedValuePath=Id SelectedValue={Binding Customer.CompanyId, ValidatesOnDataErrors=True} DisplayMemberPath=Name

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Consider the following XAML:

<ComboBox Name="CompanyComboBox" 
    HorizontalAlignment="Stretch"
    ItemsSource="{Binding Path=GlobalData.Companies}" 
    SelectedValuePath="Id"
    SelectedValue="{Binding Customer.CompanyId, ValidatesOnDataErrors=True}"
    DisplayMemberPath="Name" />

GlobalData.Companies is a collection (IEnumerable<Company>) of companies; this collection can be reloaded on background (it is downloaded from a webservice). When this happens, ComboBox correctly reloads items via binding. However as a side-effect, it also resets the selected item!

I have used Reflector to inspect combo-box sources and apparently this is intended behavior.

Is there any “nice” way how to get around this? What I want to achieve, is that if the user selects “Company A” and reloads list of companies afterwards, then “Company A” stays selected (assuming it is in the new list).

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1 Answer

  1. Editorial Team

    Maybe you can use ObservableCollection<Company> instead of your IEnumerable<Company>? Then, on background change you would only Add / Remove items that are new / absent in the new list, selected item should stay, unless it was removed by the change.

    You can update your observable collection in a separate thread with a small hack-around.

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