Listpicker Multiple selection and DisplayMemberPath

问题

I have a collection of my custom entity that is bound to the listpicker using the ItemsSource property. I also have selection mode set to Multiple so I have a checkbox with each item in the FullMode picker. This picking works, fine, and I can easily access all objects that were picked thru code. What I'm having troubles with is the DisplayMemberPath. I want to display something more friendly than the namespace of the object that is selected. Perhaps a count of selected items, or a comma separated list of the values selected.

Unfortunately, 'AccountId' doesn't work when I set the SelectionMode="Multiple". Single mode is fine. Any ideas?

<toolkit:ListPicker 
    x:Name="accountlistpicker"
    Grid.Row="0" Header="accounts" 
    SelectionMode="Multiple"
    DisplayMemberPath="AccountId"
    ItemsSource="{Binding AllAccounts}" 
    FullModeItemTemplate="{StaticResource AccountsListPickerFullItemTemplate}" />

回答1:

You need to assign function to SummaryForSelectedItemsDelegate that will process how summary string will looks like.

Check this for learn more

来源：https://stackoverflow.com/questions/8670898/listpicker-multiple-selection-and-displaymemberpath