Xamarin启动

Question

I am a newbie in Xamarin. I created a C# cross-platform project, after the project has been created there were several errors I don't know why these errors occurred. How can I fix these errors? When I click build nothing displays. When I click Play my default app does not display.

App.xaml

<?xml version="1.0" encoding="utf-8" ?>
<Application xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="App1.App">
    <Application.Resources>

    </Application.Resources>
</Application>

MainPage.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"
             xmlns:local="clr-namespace:App1"
             x:Class="App1.MainPage">

    <StackLayout>
        <!-- Place new controls here -->
        <Label Text="Welcome to Xamarin.Forms!" 
           HorizontalOptions="Center"
           VerticalOptions="CenterAndExpand" />
    </StackLayout>

</ContentPage>

MainPage.xaml.cs

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

namespace App1
{
    public partial class MainPage : ContentPage
    {
        public MainPage()
        {
            InitializeComponent();
        }
    }
}

Answer 1

Try to reinstall the Xamarin with Visual studio , It seems there has been something missing form installation. You can find the documentation here

https://docs.microsoft.com/en-us/xamarin/cross-platform/get-started/installation/windows

Regards

Answer 2

• Right click on your project
• Manage Nuuget Packages
• Installed tab : Check if Xamarin is intalled, if yes update it, if not install xamarin
• Clean and rebuild your project.