TabbedPage - TabbedPage.Children, NavigationPage: Missing default constructor

Question

Hi,

I'm Xamarin Newbies. I just learn Xamarin TabbedPage with Child as following page,

MainTabbedPage.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:mainPages="clr-namespace:App16Crud.Views"
             x:Class="App16Crud.Views.MainTabbedPage">




    <TabbedPage.Children>

        <NavigationPage Title="Dashboard">
            <x:Arguments>
                <mainPages:DashboardPage />
            </x:Arguments>
        </NavigationPage>

        <NavigationPage Title="Daily">
            <x:Arguments>
                <mainPages:Tab2Page />
            </x:Arguments>
        </NavigationPage>

        <NavigationPage Title="Logout">
            <x:Arguments>
                <mainPages:Tab3Page />
            </x:Arguments>
        </NavigationPage>

    </TabbedPage.Children>



</TabbedPage>

Everything is fine. All Pages added successfully

I try modified in Tab2Page.xaml.cs as following. This Page need a Parameter. See below,

Tab2Page.xaml.cs

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

using Xamarin.Forms;
using Xamarin.Forms.Xaml;
using App16Crud.Models;

namespace App16Crud.Views
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class Tab2Page : ContentPage
    {
        public Tab2Page(Book book)
        {
            InitializeComponent();
        }
    }
}

It return - Missing default constructor

How MainTabbedPage.xaml call Tab2Page with default constructor? Tab2Page.xaml need parameter

Please help

Answer 1

Hello,​

Welcome to our Microsoft Q&A platform!

Please add default constructor without parameter like following code.

   [XamlCompilation(XamlCompilationOptions.Compile)]  
       public partial class Tab2Page : ContentPage  
       {  
           public Tab2Page()  
           {  
               InitializeComponent();  
           }  
     
           public Tab2Page(Book book)  
           {  
               InitializeComponent();  
           }  
       }  

Best Regards,

Leon Lu

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