目前在 UWP 项目中，如果要引入 WebView 2 控件，需要安装 Microsoft.UI.Xaml (WinUI 2 ) Nuget 包。然而 WinUI 2却不能在打包项目中包含 WinUI 3 桌面应用程序或项目不是打包项目时中引用。
Currently in the UWP project, if you want to introduce WebView 2 controls, you need to install the Microsoft.UI.Xaml (WinUI 2) Nuget package. WinUI 2, however, cannot be referenced when a WinUI 3 desktop application is included in a package project or when the project is not a package project.
Microsoft 在 WinUI 2 中已经提供了 WebView 2 c++ WinRT 的源代码供 c++ 或 C# 等其他编程语言使用，这是我根据 WebView 2 c++ 源代码，转换为 c# 版本的 WebView 2 控件。
Microsoft in WinUI 2 has provided WebView 2 c++ WinRT source code for c++ or C# and other programming languages to use, this is my WebView 2 c++ source code, converted to c# version of WebView 2 control.
UWP WebView 2 项目说明：https://learn.microsoft.com/microsoft-edge/webview2/get-started/winui2
UWP WebView 2 project description: https://learn.microsoft.com/microsoft-edge/webview2/get-started/winui2
