在IIS Express中调试ASP.NET根应用下的ASP.NET Core子应用

环境与现有部署 #

在IIS Express 10中已部署ASP.NET MVC 5（.NET Framework 4.7.2）根应用及多个同框架子应用，运行正常，对应的applicationhost.config核心配置如下：

<site name="web_site_01" id="1">
 <application path="/" applicationPool="Clr4IntegratedAppPool">
   <virtualDirectory path="/" physicalPath="c:\c\Root\WebApp" />
 </application>
 <application path="/subbapp01" applicationPool="Clr4IntegratedAppPool">
  <virtualDirectory path="/" physicalPath="c:\c\subbapp01\WebApp" />
  </application>
 <application path="/subbapp02" applicationPool="Clr4IntegratedAppPool">
  <virtualDirectory path="/" physicalPath="c:\c\subbapp02\WebApp" />
 </application>
 <bindings>
  <binding protocol="http" bindingInformation="*:5000:localhost" />
  <binding protocol="https" bindingInformation="*:5001:localhost" />
 </bindings>
</site>

后续新增一个ASP.NET Core 8.0 WebAPI，以进程内托管模式作为根应用的子应用部署，通过配置无托管应用池实现了正常运行，修改后的applicationhost.config核心配置如下：

<applicationPools>
  <add name="Clr4IntegratedAppPool" managedRuntimeVersion="v4.0" managedPipelineMode="Integrated" CLRConfigFile="%IIS_USER_HOME%\config\aspnet.config" autoStart="true" />
  <add name="NoManagedApi_subappNetCore01" managedRuntimeVersion="" />
  <applicationPoolDefaults managedRuntimeVersion="v4.0">
    <processModel loadUserProfile="true" setProfileEnvironment="false" />
  </applicationPoolDefaults>
</applicationPools>
<sites>
 <site name="web_site_01" id="1">
  <application path="/" applicationPool="Clr4IntegratedAppPool">
    <virtualDirectory path="/" physicalPath="c:\c\Root\WebApp" />
  </application>
  <application path="/subapp01" applicationPool="Clr4IntegratedAppPool">
   <virtualDirectory path="/" physicalPath="c:\c\subapp01\WebApp" />
   </application>
  <application path="/subapp02" applicationPool="Clr4IntegratedAppPool">
   <virtualDirectory path="/" physicalPath="c:\c\subapp02\WebApp" />
  </application>
  <application path="/subappNetCore01" applicationPool="NoManagedApi_subappNetCore01">
   <virtualDirectory path="/" physicalPath="c:\c\subappNetCore01\Api" />
  </application>
  <bindings>
   <binding protocol="http" bindingInformation="*:5000:localhost" />
   <binding protocol="https" bindingInformation="*:5001:localhost" />
  </bindings>
 </site>
</sites>

调试问题 #

在Visual Studio 2022 17.8中调试时遇到以下问题：

• 以根项目启动调试时，调试器不会自动加载ASP.NET Core子应用；
• IIS Express进程已被VS调试占用，无法手动附加调试器到该进程，导致无法调试ASP.NET Core子应用；
• 若切换为进程外托管模式，Core应用会在独立端口启动，违背了作为根应用子应用部署的需求。

ASP.NET Core应用相关配置 #

web.config #

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <location path="." inheritInChildApplications="false">
    <connectionStrings>
      <clear />
    </connectionStrings>
    <appSettings>
      <clear />
    </appSettings>
    <system.webServer>
      <handlers>
        <remove name="aspNetCore" />
        <add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModuleV2" resourceType="Unspecified" />
      </handlers>
        <aspNetCore processPath="dotnet"
                  arguments=".\bin\Debug\net8.0\subappNetCore01.dll"
                  stdoutLogEnabled="true"
                  stdoutLogFile="c:\temp\logs\stdout" 
                  hostingModel="inprocess" >
        <environmentVariables>
          <environmentVariable name="ASPNETCORE_ENVIRONMENT" value="Development" />
        </environmentVariables>
      </aspNetCore>
      <modules>
        <!-- Remove All managed modules because app pool is "no managed" -->
        <remove name="OutputCache" />
        <remove name="Session" />
        <remove name="WindowsAuthentication" />
        <remove name="DefaultAuthentication" />
        <remove name="RoleManager" />
        <remove name="UrlAuthorization" />
        <remove name="FileAuthorization" />
        <remove name="AnonymousIdentification" />
        <remove name="Profile" />
        <remove name="UrlMappingsModule" />
        <remove name="UrlRoutingModule-4.0" />
        <remove name="ScriptModule-4.0" />
        <remove name="HtmlMinificationModule" />
        <remove name="TelemetryCorrelationHttpModule" />
        <remove name="ApplicationInsightsWebTracking" />
        <!-- Remove Incompatilbe native modules -->
        <remove name="CustomErrorModule" />
        <remove name="DefaultDocumentModule" />
        <remove name="DirectoryListingModule" />
        <remove name="FileCacheModule" />
        <remove name="HttpCacheModule" />
        <remove name="ServerSideIncludeModule" />
        <remove name="StaticCompressionModule" />
        <remove name="StaticFileModule" />
        <remove name="WebDAV" />
      </modules>
    </system.webServer>
  </location>
</configuration>
<!--ProjectGuid: 7d3ad76a-f767-4d6f-a7b8-b61b422076c0-->

Program.cs #

var builder = WebApplication.CreateBuilder(args);
...
builder.WebHost.UseIIS();
var app = builder.Build();
...
app.UsePathBase("/subappNetCore01");
...
app.MapControllers();
app.Run();

已尝试的方案 #

• 调整ASP.NET Core应用的web.config配置；
• 切换进程外托管模式测试；
• 将Core应用单独或与根应用组合设置为VS启动项；
  以上尝试均无法实现自动加载调试器或成功附加调试器。

提问 #

此部署调试场景是否可行？是否遗漏了关键配置？

内容的提问来源于stack exchange，提问作者Dim Tsoumg