无法显示：显示警报

Question

我正在尝试显示，当我单击“ OnLogOut”时显示警报，但它不令人担心，我看不到原因

 <StackLayout Grid.Row="1"  BackgroundColor="White"  HorizontalOptions="FillAndExpand"  Orientation="Vertical"  VerticalOptions="FillAndExpand" Spacing="30" Padding="0,0,0,0">

                            <StackLayout Orientation="Horizontal"  HorizontalOptions="Center">
                                <!--Le text est dans la classe-->
                                <Label  x:Name="myemail"   Text=""  TextColor="#36688D" Font="Bold,Italic,20" />
                            </StackLayout>

                            <StackLayout Orientation="Horizontal"  HorizontalOptions="Center">
                                <Label HorizontalOptions="Center"
                                     TextColor="#36688D"
                                     FontSize="15"
                                     Text="Log Out"  x:Name="mylogout">     
                                    <Label.GestureRecognizers>
                                        <TapGestureRecognizer Tapped="OnLogOut"  />
                                    </Label.GestureRecognizers>
                                </Label>
                            </StackLayout>
                        </StackLayout>

这是我的C＃代码：

 public async void OnLogOut(object sender, EventArgs args)


            {
       Console.WriteLine("Log out is tapped");
                await DisplayAlert("Email", "Your email please", "✔");
    }

预先感谢