Question

I binded a database table’s primary key to the selectedIndex of a combobox. the problem occurs where the primary key starts from 1 but selectedIndex accepts from 0. I mean, when I want to see the item with ID=1 in database, since it’s listed as first element in combobox with index 0, it displays the second element in the list, which is considered with ID=1 in the combobox. Can anyone help me on solving this problem?

Thanks in advance.
here’s my combobox:

<ComboBox SelectedIndex="{Binding SC.User1.UserID, UpdateSourceTrigger=PropertyChanged }"         
          IsSynchronizedWithCurrentItem="True"
          x:Name="proxyResponsibleUserCmb" ItemsSource="{Binding Users, Mode=OneTime}"
          SelectedItem="{Binding SC.User1.FullName, ValidatesOnDataErrors=True,                   
                         UpdateSourceTrigger=PropertyChanged}"
          Validation.ErrorTemplate="{x:Null}"  
          Height="23" 
          VerticalAlignment="Top" 
          HorizontalAlignment="Left" 
          Width="118" 
          Margin="184,3,0,0" 
          Grid.Row="0" 
          Grid.Column="1"/>

Answer 1

What about using the ComboBox’s SelectedValuePath and DisplayMemberPath, and setting your default item with SelectedValue instead of SelectedItem?

<ComboBox x:Name="proxyResponsibleUserCmb" 
    SelectedValuePath="{Binding UserID}" 
    DisplayMemberPath="{Binding FullName}"
    SelectedValue="{Binding SC.User1.UserId, ValidatesOnDataErrors=True,  UpdateSourceTrigger=PropertyChanged}" 
    ItemsSource="{Binding Users, Mode=OneTime}" />