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Question

我正在尝试在 Xamarin 中制作 TabbedPage

UserTabbedPage.xaml

<?xml version="1.0" encoding="UTF-8"?>
<TabbedPage xmlns="http://xamarin.com/schemas/2014/forms" 
            xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
            xmlns:local="clr-namespace:MyApp.General.Users.UserProfile;assembly=MyApp"
            x:Class="MyApp.General.Users.UserProfile.UserTabbedPage">
    <local:UserPage />
</TabbedPage>

UserTabbedPage.xaml.cs

using System;
using System.Collections.Generic;
using Xamarin.Forms;

namespace MyApp.General.Users.UserProfile
{
    public partial class UserTabbedPage : TabbedPage
    {
        public UserTabbedPage()
        {
            InitializeComponent();
        }
    }
}

用户页面.xaml

<?xml version="1.0" encoding="UTF-8"?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" 
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" 
             x:Class="MyApp.General.Users.UserProfile.UserPage">
    <ContentPage.Content>
    </ContentPage.Content>
</ContentPage>

用户页面.xaml.cs

using System;
using System.Collections.Generic;
using Xamarin.Forms;

namespace MyApp.General.Users.UserProfile
{
    public partial class UserPage : ContentPage
    {
        public UserPage(User user)
        {
            InitializeComponent();
        }
    }
}

但我得到错误：字典中不存在给定键“Xamarin.Forms.Xaml.ElementNode”

当我User user从public UserPage(User user). 但是我需要稍后在构造函数中使用这个类。

Answer 1

通过添加第二个不带参数的构造函数来解决