Razor Pages应用，修改页面查看修改效果，如果没有热重载，改一句话跑一次，这个活就没法干了。

1、VS2022中的NuGet中安装RuntimeCompilation

Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation

需要配套你的.net sdk版本，我这里用的是6.0，所以这个也用了6.0.0。

2、找到你的Properties\launchSettings.json

主要是这句话"ASPNETCORE_HOSTINGSTARTUPASSEMBLIES": "Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation"，配置在

{"iisSettings": {"windowsAuthentication": false,"anonymousAuthentication": true,"iisExpress": {"applicationUrl": "http://localhost:5955","sslPort": 44378}},"profiles": {"chocolate": {"commandName": "Project","dotnetRunMessages": true,"launchBrowser": true,"applicationUrl": "https://localhost:7103;http://localhost:5138","environmentVariables": {"ASPNETCORE_ENVIRONMENT": "Development","ASPNETCORE_HOSTINGSTARTUPASSEMBLIES": "Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation"}},"IIS Express": {"commandName": "IISExpress","launchBrowser": true,"environmentVariables": {"ASPNETCORE_ENVIRONMENT": "Development"}}}
}

3、可以选择文件保存时热重载

我测试这样是ok的，修改文件之后页面就会变化。