Xamarin.forms中重复的联系电话

Question

从电话中检索联系人列表时遇到问题，我在Xamarin.Forms中获得所有联系人姓名的相同联系人号码。 我是Xamarin的新手，想在listview中加载所有电话联系人。 这是我的代码：

  private List<ContactMenu> LoadAllContacts()
    {
        List<ContactMenu> getContactNamesAndNumber = new List<ContactMenu>();
        //Bind Contacts
        var forContactNames = ContactsContract.Contacts.ContentUri;
        string[] forContactNumbers = {
        ContactsContract.Contacts.InterfaceConsts.Id,
        ContactsContract.Contacts.InterfaceConsts.DisplayName
    };
        var forContactNumber = ContactsContract.CommonDataKinds.Phone.ContentUri;
        string[] forContactDisplayNumber = { ContactsContract.Contacts.InterfaceConsts.Id, ContactsContract.CommonDataKinds.Phone.Number };
        var names = ManagedQuery(forContactNames, forContactNumbers, null, null, null);
        var nameList = new List<string>();
        var number = ManagedQuery(forContactNumber, forContactDisplayNumber, null, null, null);
        var numbeList = new List<string>();
        if (names.MoveToFirst() && number.MoveToFirst())
        {
            do
            {
                getContactNamesAndNumber.Add(new ContactMenu
                {
                   ContactName =  names.GetString(names.GetColumnIndex(forContactNumbers[1])), ContactNumber = number.GetString(number.GetColumnIndex(forContactDisplayNumber[1]))
                });
                numbeList.Add(number.GetString(number.GetColumnIndex(forContactDisplayNumber[1])));
                nameList.Add(names.GetString(names.GetColumnIndex(forContactNumbers[1])));
            } while (names.MoveToNext());
        }
        ListAdapter = new ArrayAdapter<string>(this, Resource.Layout.ContactItemView, numbeList);
        return getContactNamesAndNumber;
    }

和我的Xaml：

 <StackLayout HorizontalOptions="Center">
    <Label Text="Please Select Contact" TextColor="Black" FontFamily="Arial" FontSize="Medium" Font="16"></Label>
    <ListView x:Name="myContacts" HorizontalOptions="Start" ItemTapped="myContacts_ItemTapped">
        <ListView.ItemTemplate>
            <DataTemplate>
                <TextCell Text="{Binding ContactName}" DetailColor="Green" TextColor="Black"/>
            </DataTemplate>
        </ListView.ItemTemplate>
    </ListView>
</StackLayout>

Answer 1

您有两个ManagedQuery ，即names和number但仅在do循环的末尾通过names.MoveToNext()来推进names查询。

您应该删除其中一个ManagedQuery并在一个查询中返回所需的所有列，以便可以从same数据行中获取名称和匹配编号。