WP8 联系人异步搜索 - 仅返回带有电话号码的联系人？

我正在开发一个需要自定义联系人列表的应用程序。到目前为止，该应用程序查询联系人，将它们全部显示在列表框中，允许多项选择，并且现在仅将所有选定的电话号码写入调试器输出。但我注意到的一件事是，在同步搜索后所有联系人都可用，因此其中一些不包含电话号码。

现在，在 Android 上，存在一个布尔运算符来过滤联系人 - 这就是 contact.HasPhoneNumber，使查询联系人变得非常容易......到目前为止，我找不到 Windows 的任何等效项。我真的很感激任何帮助。

下面是供您细读的相关代码以及随附的 XAML。

谢谢

联系方式.cs

public partial class contact : PhoneApplicationPage
    {
        public class CustomContact
        {
            public string Name { get; set; }
            public string Number { get; set; }

            public CustomContact()
            {
            }

            //CTOR that takes in a Contact object and extract the two fields we need (can add more fields)
            public CustomContact(Contact contact)
            {
                Name = contact.DisplayName;
                var number = contact.PhoneNumbers.FirstOrDefault();
                if (number != null)
                    Number = number.PhoneNumber;
                else
                    Number = "";
            }
        }

        public contact()
        {
            InitializeComponent();
        }

        private void showContacts(object sender, RoutedEventArgs e)
        {
            Contacts cons = new Contacts();

            //Identify the method that runs after the asynchronous search completes.
            cons.SearchCompleted += new EventHandler<ContactsSearchEventArgs>(Contacts_SearchCompleted);

            //Start the asynchronous search.
            cons.SearchAsync(String.Empty, FilterKind.None, "Contacts Test #1");
        }

        void Contacts_SearchCompleted(object sender, ContactsSearchEventArgs e)
        {
            //Do something with the results.
            MessageBox.Show(e.Results.Count().ToString());
            try
            {
                //Bind the results to the user interface.
                ContactResultsData.DataContext = e.Results;

            }
            catch (System.Exception)
            {
                //No results
            }

            if (ContactResultsData.Items.Any())
            {
                ContactResultsLabel.Text = "results";
            }
            else
            {
                ContactResultsLabel.Text = "no results";
            }
        }



        private void ContactResultsData_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            Contact contact = ContactResultsData.SelectedItem as Contact;
            if (contact != null)
            {
                CustomContact customContact = new CustomContact(contact);
            }
        }

        public void saveContacts(object sender, RoutedEventArgs e)
        {
            List<CustomContact> listOfContacts = new List<CustomContact>();

            listOfContacts = ContactResultsData.SelectedItems.Cast<Contact>().Select(x => new CustomContact()
            {
                Number = x.PhoneNumbers.FirstOrDefault() != null ? x.PhoneNumbers.FirstOrDefault().PhoneNumber : "",
                Name = x.DisplayName
            }).ToList();


            foreach (var c in listOfContacts)
            {
                Debug.WriteLine(c.Number.ToString());
            }

        }
    }

XAML

<!--LayoutRoot is the root grid where all page content is placed-->
    <Grid x:Name="LayoutRoot" Background="Transparent">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        <!--TitlePanel contains the name of the application and page title-->
        <StackPanel Grid.Row="0" Margin="12,17,0,28">
            <TextBlock Text="AppName" Style="{StaticResource PhoneTextNormalStyle}"/>
            <TextBlock Text="contacts" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>
        </StackPanel>

        <!--ContentPanel - place additional content here-->
        <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
            <StackPanel Height="Auto" Width="Auto" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="0,0,0,10" >

                <TextBlock Name="ContactResultsLabel" Text="results are loading..." Style="{StaticResource PhoneTextLargeStyle}" TextWrapping="Wrap" />

                <ListBox Name="ContactResultsData" ItemsSource="{Binding}" Height="436" Margin="12,0" SelectionMode="Multiple" >
                    <ListBox.ItemTemplate>
                        <DataTemplate>
                            <TextBlock Name="ContactResults" FontSize="{StaticResource PhoneFontSizeMedium}" Text="{Binding Path=DisplayName, Mode=OneWay}" />
                        </DataTemplate>
                    </ListBox.ItemTemplate>
                </ListBox>
            </StackPanel>
            <Button x:Name="showButton" Content="Show Contacts" HorizontalAlignment="Left" VerticalAlignment="Top" Width="218" Height="90" Margin="0,531,0,0" Click="showContacts"/>
            <Button x:Name="saveButton" Content="Save Contacts" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="238,531,0,0" Width="218" Height="90" Click="saveContacts"/>
        </Grid>
    </Grid>

EDIT