ASP.NET Core 6 Web API命令行启动IIS Express加载Swagger遇500错误求助

运行现象 #

• VS2022启动IIS Express正常：可正常加载Swagger页面（http://localhost:8084/swagger/index.html），请求日志如下：

#Software: Microsoft Internet Information Services 10.0
#Version: 1.0
#Date: YYYY-DD-MM 17:49:22
#Fields: date time s-ip cs-method cs-uri-stem cs-uri-query s-port cs-username c-ip cs(User-Agent) cs(Referer) sc-status sc-substatus sc-win32-status time-taken
YYYY-DD-MM 17:49:22 ::1 GET /_framework/aspnetcore-browser-refresh.js - 8084 - ::1 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/107.0.0.0+Safari/537.36 http://localhost:8084/swagger/index.html 200 0 0 6
YYYY-DD-MM 17:49:22 ::1 GET /swagger/index.html - 8084 - ::1 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/107.0.0.0+Safari/537.36 - 200 0 0 3664
YYYY-DD-MM 17:49:22 ::1 GET /_vs/browserLink - 8084 - ::1 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/107.0.0.0+Safari/537.36 http://localhost:8084/swagger/index.html 200 0 0 59
YYYY-DD-MM 17:49:22 ::1 GET /swagger/v1/swagger.json - 8084 - ::1 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/107.0.0.0+Safari/537.36 http://localhost:8084/swagger/index.html 200 0 0 149

• 命令行启动IIS Express失败：执行以下命令启动后，Swagger页面返回HTTP 500错误：

"C:\Program Files (x86)\IIS Express\iisexpress" /config:applicationhost.config /site:TheWebApi

请求日志如下：

#Software: Microsoft Internet Information Services 10.0
#Version: 1.0
#Date: 2022-11-19 17:54:41
#Fields: date time s-ip cs-method cs-uri-stem cs-uri-query s-port cs-username c-ip cs(User-Agent) cs(Referer) sc-status sc-substatus sc-win32-status time-taken
2022-11-19 17:54:41 ::1 GET /swagger/index.html - 8084 - ::1 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/107.0.0.0+Safari/537.36 - 500 0 574 8
2022-11-19 17:54:41 ::1 GET /favicon.ico - 8084 - ::1 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/107.0.0.0+Safari/537.36 http://localhost:8084/swagger/index.html 500 0 574 0

错误原因分析 #

查看系统事件日志，发现核心错误：

Application 'C:\Users\sam\source\repos\WebApplication1\' failed to start. Exception message:
Executable was not found at 'C:\Users\sam\source\repos\WebApplication1\bin\Debug\net5.0\WebApplication1.exe'

该项目原本基于.NET 5开发，现已升级至.NET 6，但IIS Express仍在查找.NET 5版本的程序路径，导致启动失败。

配置对比 #

对比新建的.NET 6 Web API项目（WebApplication2）的applicationhost.config，现有项目（WebApplication1）的站点配置段如下：

<site name="WebApplication1" id="2">
<application path="/" applicationPool="WebApplication1 AppPool">
  <virtualDirectory path="/" physicalPath="C:\Users\sam\source\repos\WebApplication1" />
</application>
<bindings>
  <binding protocol="http" bindingInformation="*:8084:localhost" />
</bindings>
</site>

提问 #

由于希望不依赖VS2022启动服务，是否应将physicalPath修改为C:\Users\sam\source\repos\WebApplication1\bin\Debug\net6.0？

内容的提问来源于stack exchange，提问作者Sam Carleton