WPF+WebView 基础

1、基于.NET8，通过NuGet添加Microsoft.Web.WebView2。

2、MainWindow.xaml代码如下。

XML 复制代码

<Window x:Class="Demo.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:Pangu"
        mc:Ignorable="d"
        xmlns:wv2="clr-namespace:Microsoft.Web.WebView2.Wpf;assembly=Microsoft.Web.WebView2.Wpf"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="50"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <StackPanel Grid.Row="0" Orientation="Horizontal">
            <Button x:Name="btnCallJS" Click="CallJSFunction_Click" Content="C# Call JavaScript" Width="120" Height="30" Margin="10,10,0,10"/>
        </StackPanel>
        <DockPanel Grid.Row="1">
            <wv2:WebView2 Name="webView"/>
        </DockPanel>
    </Grid>

</Window>

3、MainWindow.xaml.cs代码如下。

cs 复制代码

using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Microsoft.Web.WebView2.Core;
using System;
using System.IO;
using System.Windows;
using Path = System.IO.Path;

namespace Demo
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            // 页面加载初始化
            InitializeAsync();
            // 将C#对象注入到WebView2中
            InitializeWebViewAsync();
        }

        private async void InitializeWebViewAsync()
        {
            await webView.EnsureCoreWebView2Async(null);
            webView.CoreWebView2.AddHostObjectToScript("webBrowserObj", new ScriptCallbackObject());
            await webView.CoreWebView2.AddScriptToExecuteOnDocumentCreatedAsync("var webBrowserObj = window.chrome.webview.hostObjects.webBrowserObj;");
        }

        private async void InitializeAsync()
        {
            await webView.EnsureCoreWebView2Async(null);
            // 获取当前应用程序的目录
            string appDirectory = AppDomain.CurrentDomain.BaseDirectory+ "Pages\\";
            // 构造HTML文件的相对路径（假设HTML文件名为index.html）
            string htmlFilePath = Path.Combine(appDirectory, "index.html");
            // 将文件路径转换为URI
            Uri htmlFileUri = new Uri(htmlFilePath, UriKind.Absolute);
            // 设置WebView2的源为HTML文件的URI
            webView.Source = htmlFileUri;
        }

        private async void CallJSFunction_Click(object sender, RoutedEventArgs e)
        {
            // 假设你要调用的JavaScript函数名为 ShowAlert，它不接受任何参数
            string msg = "Hello from C#!";
            string script = $"ShowAlert('{ msg }');";
            await webView.CoreWebView2.ExecuteScriptAsync(script);
        }

    }
}

4、 ScriptCallbackObject.cs代码如下。

cs 复制代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace Demo
{
    /// <summary>
    /// JavaScript调用C#函数类
    /// </summary>
    [ClassInterface(ClassInterfaceType.AutoDual)]
    [ComVisible(true)]
    public class ScriptCallbackObject
    {
        public void ShowMessage(string message)
        {
            MessageBox.Show(message);
        }
    }
}

5、index.html页面代码如下。

html 复制代码

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>WebView2 Index</title>
    <script>
        document.addEventListener("DOMContentLoaded", function() {
            var button = document.getElementById("btnBroadCast");
            button.addEventListener("click", function() {
                webBrowserObj.ShowMessage("Hello from JavaScript!");
            });
        });

        function ShowAlert(message) {
            document.getElementById("title").innerHTML = message;
        }

        function showAlert(message) {
            document.getElementById("title").innerHTML = message;
        }
    </script>
</head>

<body>
    <button id="StartBroadCast">开始广播</button>
    <!-- <button id="btnBroadCCast" hidden="true">开始测试</button> -->
    <button id="btnBroadCast">开始测试</button>
    <h1 id="title"></h1>
</body>

</html>

6、运行效果如下。