.NET 9.0 MAUI 之 Android 及 Windows 跨平台开发之初体验VS 2022在调试Windows

项目文件

源代码：files.cnblogs.com/files/cncc/…

注：

1、本项目使用VS 2022开发环境、.NET 9 框架

2、Android 框架:

最小框架：Android9.0(API Level 28 - Pie)

目标框架：Android15.0(API Level 35)

3、Windows框架：

最小框架：10.0.17763.0

目标框架：10.0.19041.0

4、如无法编译等情况出现，请确保VS 2022是最新的且MAUI工作负载等环境已安装

5、VS 2022在调试Windows桌面应用程序(包含MAUI、WinUI3、UWP)时，暂不支持设计器视图，请使用热重载功能

配置页面

MainPage XAML代码

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage
    x:Class="MauiApp1.MainPage"
    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml">
    <ContentPage.Resources>
        <x:String x:Key="WebSite">https://www.cnblogs.com/cncc</x:String>
    </ContentPage.Resources>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="50" />
            <RowDefinition Height="5" />
            <RowDefinition Height="40" />
            <RowDefinition Height="5" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <Grid Grid.Row="0" Margin="5">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="1*" />
                <ColumnDefinition Width="5" />
                <ColumnDefinition Width="1*" />
                <ColumnDefinition Width="5" />
                <ColumnDefinition Width="1*" />
            </Grid.ColumnDefinitions>
            <Button
                Grid.Column="0"
                Clicked="Button1_Clicked"
                Text="主页" />
            <Button
                Grid.Column="2"
                Clicked="Button2_Clicked"
                IsEnabled="{Binding Source={x:Reference CnxyWebView}, Path=CanGoBack}"
                Text="后退" />
            <Button
                Grid.Column="4"
                Clicked="Button3_Clicked"
                IsEnabled="{Binding Source={x:Reference CnxyWebView}, Path=CanGoForward}"
                Text="前进" />
        </Grid>
        <Entry
            x:Name="UrlLabel"
            Grid.Row="2"
            Margin="5,0,5,0"
            IsReadOnly="True"
            SemanticProperties.HeadingLevel="Level1"
            Text="{StaticResource WebSite}" />
        <ScrollView Grid.Row="4">
            <WebView
                x:Name="CnxyWebView"
                Navigated="CnxyWebView_Navigated"
                Source="{StaticResource WebSite}"
                VerticalOptions="Fill" />
        </ScrollView>
    </Grid>
</ContentPage>

Toast通知

使用了CommunityToolkit.Maui类库(此项针对Android有效)，需在MauiProgram.cs文件中配置，代码如下：

//必须先在Nuget安装CommunityToolkit.Maui包才能使用
//增加了启用Toast通知，使用CommunityToolkit.Maui命名空间
using CommunityToolkit.Maui;
using Microsoft.Extensions.Logging;

namespace MauiApp1
{
    public static class MauiProgram
    {
        public static MauiApp CreateMauiApp()
        {
            var builder = MauiApp.CreateBuilder();
            builder
                //增加此行代码
                .UseMauiCommunityToolkit()

                .UseMauiApp<App>()
                .ConfigureFonts(fonts =>
                {
                    fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
                    fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
                });

#if DEBUG
    		builder.Logging.AddDebug();
#endif

            return builder.Build();
        }
    }
}

增加MyToast.cs文件，用以实际的通知调用，代码如下：

using CommunityToolkit.Maui.Alerts;
using CommunityToolkit.Maui.Core;

namespace MauiApp1
{
    internal class MyToast
    {
        public static void Show(string message)
        {
            var toast = Toast.Make(message, ToastDuration.Long);
            toast.Show();
        }
    }
}

MainPage后置代码

namespace MauiApp1
{
    public partial class MainPage : ContentPage
    {
        public MainPage()
        {
            InitializeComponent();
        }
        private BroswerStatus broswerStatus;
        private void Announce(WebNavigationResult result)
        {
            string message = string.Empty;
            bool netWorkNoError = false;
            if ((netWorkNoError = result == WebNavigationResult.Success) && broswerStatus == BroswerStatus.Home)
            {
                message = "已回到主页";
            }
            else
            {
                if(!netWorkNoError)message = "无法网络，请检查！";
            }
            if(string.IsNullOrEmpty(message)) return;
            MyToast.Show(message);
            broswerStatus = BroswerStatus.None;
        }
        private void Button1_Clicked(object sender, EventArgs e)
        {
            if (!(this.Resources["WebSite"] is string webSite)) return;
            broswerStatus = BroswerStatus.Home;
            CnxyWebView.Source = webSite;
        }

        private void Button2_Clicked(object sender, EventArgs e)
        {
            if (!CnxyWebView.CanGoBack) return;
            broswerStatus = BroswerStatus.Back;
            CnxyWebView.GoBack();
        }

        private void Button3_Clicked(object sender, EventArgs e)
        {
            if (!CnxyWebView.CanGoForward) return;
            broswerStatus = BroswerStatus.Forward;
            CnxyWebView.GoForward();
        }

        private void CnxyWebView_Navigated(object sender, WebNavigatedEventArgs e)
        {
            UrlLabel.Text = e.Url;
            Announce(e.Result);
        }

        enum BroswerStatus
        {
            None,
            Home,
            Back,
            Forward
        }
    }
}