在MainPage.xaml.cs -xamarin-C＃中看不到對象

Question

不能從MainPage.xaml中看到標簽或按鈕，錯誤消息“當前內容中不存在名稱greetinglabel”

MainPage.xaml代碼

         <ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
                      xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
                      xmlns:local="clr-namespace:hello"
                      x:Class="hello.MainPage">

<StackLayout>
    <Label x:Name="greetinglabel"
           Text="Welcome to Xamarin.Forms!" 
       HorizontalOptions="Center"
       VerticalOptions="Center" />
    <Entry x:Name="nameEntry"
           Placeholder="write your name"/>
    <Button Text="say hello"
            Clicked="Button_Clicked"/>

</StackLayout>

MainPage.xaml.cs代碼

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using Xamarin.Forms;

 namespace hello
{
public partial class MainPage : ContentPage
{
    public MainPage()
    {
        InitializeComponent();
    }

    void Button_Clicked(object sender, EventArgs e)
    {

    }
}
}

Answer 1

像這樣在“內容”頁面內容中添加堆棧布局。

<ContentPage.Content>
    <StackLayout>
    <Label x:Name="greetinglabel"
           Text="Welcome to Xamarin.Forms!" 
       HorizontalOptions="Center"
       VerticalOptions="Center" />
    <Entry x:Name="nameEntry"
           Placeholder="write your name"/>
    <Button Text="say hello"
            Clicked="Button_Clicked"/>
</StackLayout>
</ContentPage.Content>