使用 xamarin 的选择器项目源：

Question

我想实现一个简单的选择器 XAML，当我从选择器中选择一个值时，将自动填充（数据来自 firebase）。这是我所拥有的：

view Model xaml:

  <Picker  HeightRequest="50" 
                 x:Name="AppoiPatientName" Title="Patient Name" FontSize="Large"
                 SelectedItem="{Binding AppointmentPatientName}"
                 ItemsSource="{Binding AllAppointment}"
                 ItemDisplayBinding="{Binding AppointmentPatientName}">
            </Picker>

file cs

var picker = new Picker { Title = "Patient Name" };
          picker.SetBinding(Picker.ItemsSourceProperty, "AllAppointment");
           picker.SetBinding(Picker.SelectedItemProperty, "AppointmentPatientName");
          picker.ItemDisplayBinding = new Binding("AppointmentPatientName");

model view :

public void AllAppointment()
    {public void AllAppointment()
    {
        services = new AppintmentService();
        Schedules = services.getScheduleAppointment();
    }
        services = new AppintmentService();
        Schedules = services.getScheduleAppointment();
    }

services

public ObservableCollection<Appoitment> getScheduleAppointment()
    {
        var ScheduleData = firebaseClient
         .Child("$Specalists / 406707265 / Patients / 0 / Appointments")
         .AsObservable<Appoitment>()
         .AsObservableCollection();

        return ScheduleData;
    }

Answer 1

正如 Jason 所建议的，您应该在 Xaml 或后面的代码中定义 Picker。

更重要的是，ItemsSource 属性：AllAppointment 应定义为公共属性。此外，您应该考虑使用 ObservableCollection 类型，因为这有助于获得通知当有东西被添加到这个集合中时。

因此，请使用如下所示的 AllAppointment：

public ObservableCollection<AllAppointmentModel> AllAppointment { get; set; } 
= new ObservableCollection<AllAppointmentModel>();