我最近将 ASP.NET Core 从2.2升级到了 3.1版本。在本地环境下，一切似乎都正常工作，但是在部署到IIS时出现了问题。事件查看器中显示的错误信息为：
Application: w3wp.exe
CoreCLR Version: 4.700.19.56402
.NET Core Version: 2.2.4
Description: The process was terminated due to an unhandled exception.
Exception Info: System.IO.FileNotFoundException: Could not load file or assembly 'System.Text.Json, Version=4.0.1.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.
File name: 'System.Text.Json, Version=4.0.1.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
at Microsoft.Extensions.Configuration.Json.JsonConfigurationProvider.Load(Stream stream)
at Microsoft.Extensions.Configuration.FileConfigurationProvider.Load(Boolean reload)
--- End of stack trace from previous location where exception was thrown ---
at Microsoft.Extensions.Configuration.FileConfigurationProvider.HandleException(ExceptionDispatchInfo info)
at Microsoft.Extensions.Configuration.FileConfigurationProvider.Load(Boolean reload)
at Microsoft.Extensions.Configuration.FileConfigurationProvider.Load()
at Microsoft.Extensions.Configuration.ConfigurationRoot..ctor(IList`1 providers)
at Microsoft.Extensions.Configuration.ConfigurationBuilder.Build()
at Microsoft.Extensions.Hosting.HostBuilder.BuildAppConfiguration()
at Microsoft.Extensions.Hosting.HostBuilder.Build()
at <AppName>.Program.Main(String[] args)
这很奇怪，因为这个错误信息表明它正在使用 .NET Core 版本 2.2.4。我已经安装了 .NET Core 3.1 主机捆绑包并重新启动了服务器。
我按照此文章中的故障排除提示进行尝试，并发现：
- 当尝试从命令行运行应用程序（运行
dotnet <AppName>.dll和<AppName>.exe）时，我得到了与事件查看器中完全相同的错误。 - 我在 web.config 中启用了 stdoutLog。目录被创建，但没有写入日志文件。
- 我启用了 ASP.NET Core 模块调试日志：
[aspnetcorev2.dll] Resolving hostfxr parameters for application: 'dotnet' arguments: '.\<AppName>.dll' path: 'C:\inetpub\wwwroot\<AppName>\'
[aspnetcorev2.dll] Known dotnet.exe location: ''
[aspnetcorev2.dll] Process path 'dotnet.exe' is dotnet, treating application as portable
[aspnetcorev2.dll] Resolving absolute path to dotnet.exe from 'dotnet.exe'
[aspnetcorev2.dll] Invoking where.exe to find dotnet.exe
[aspnetcorev2.dll] where.exe invocation returned: 'C:\Program Files\dotnet\dotnet.exe
C:\Program Files (x86)\dotnet\dotnet.exe
'
[aspnetcorev2.dll] Current process bitness type detected as isX64=1
[aspnetcorev2.dll] Processing entry 'C:\Program Files\dotnet\dotnet.exe'
[aspnetcorev2.dll] Binary type 6
[aspnetcorev2.dll] Found dotnet.exe via where.exe invocation at 'C:\Program Files\dotnet\dotnet.exe'
[aspnetcorev2.dll] Resolving absolute path to hostfxr.dll from 'C:\Program Files\dotnet\dotnet.exe'
[aspnetcorev2.dll] hostfxr.dll located at 'C:\Program Files\dotnet\host\fxr\3.1.0\hostfxr.dll'
[aspnetcorev2.dll] Converted argument '.\<AppName>.dll' to 'C:\inetpub\wwwroot\<AppName>\.\<AppName>.dll'
[aspnetcorev2.dll] Parsed hostfxr options: dotnet location: 'C:\Program Files\dotnet\dotnet.exe' hostfxr path: 'C:\Program Files\dotnet\host\fxr\3.1.0\hostfxr.dll' arguments:
[aspnetcorev2.dll] Argument[0] = 'C:\Program Files\dotnet\dotnet.exe'
[aspnetcorev2.dll] Argument[1] = 'C:\inetpub\wwwroot\<AppName>\.\<AppName>.dll'
[aspnetcorev2.dll] Loading hostfxr from location C:\Program Files\dotnet\host\fxr\3.1.0\hostfxr.dll
[aspnetcorev2.dll] Canceling standard stream pipe reader
[aspnetcorev2.dll] Loading request handler: 'C:\inetpub\wwwroot\<AppName>\aspnetcorev2_inprocess.dll'
[aspnetcorev2.dll] Creating handler application
[aspnetcorev2_inprocess.dll] Initializing logs for 'C:\inetpub\wwwroot\<AppName>\aspnetcorev2_inprocess.dll'. Process Id: 4100.. File Version: 13.1.19320.0. Description: IIS ASP.NET Core Module V2 Request Handler. Commit: 2b7e994b8a304700a09617ffc5052f0d943bbcba.
[aspnetcorev2_inprocess.dll] Waiting for initialization
[aspnetcorev2_inprocess.dll] Starting in-process worker thread
[aspnetcorev2_inprocess.dll] Resolving hostfxr parameters for application: 'dotnet' arguments: '.\<AppName>.dll' path: 'C:\inetpub\wwwroot\<AppName>\'
[aspnetcorev2_inprocess.dll] Known dotnet.exe location: 'C:\Program Files\dotnet\dotnet.exe'
[aspnetcorev2_inprocess.dll] Process path 'dotnet.exe' is dotnet, treating application as portable
[aspnetcorev2_inprocess.dll] Resolving absolute path to hostfxr.dll from 'C:\Program Files\dotnet\dotnet.exe'
[aspnetcorev2_inprocess.dll] hostfxr.dll located at 'C:\Program Files\dotnet\host\fxr\3.1.0\hostfxr.dll'
[aspnetcorev2_inprocess.dll] Converted argument '.\<AppName>.dll' to 'C:\inetpub\wwwroot\<AppName>\.\<AppName>.dll'
[aspnetcorev2_inprocess.dll] Parsed hostfxr options: dotnet location: 'C:\Program Files\dotnet\dotnet.exe' hostfxr path: 'C:\Program Files\dotnet\host\fxr\3.1.0\hostfxr.dll' arguments:
[aspnetcorev2_inprocess.dll] Argument[0] = 'C:\Program Files\dotnet\dotnet.exe'
[aspnetcorev2_inprocess.dll] Argument[1] = 'C:\inetpub\wwwroot\<AppName>\.\<AppName>.dll'
[aspnetcorev2_inprocess.dll] Setting environment variable ASPNETCORE_IIS_HTTPAUTH=anonymous;
[aspnetcorev2_inprocess.dll] Setting environment variable ASPNETCORE_IIS_PHYSICAL_PATH=C:\inetpub\wwwroot\<AppName>\
[aspnetcorev2_inprocess.dll] Loading hostfxr from location C:\Program Files\dotnet\host\fxr\3.1.0\hostfxr.dll
[aspnetcorev2_inprocess.dll] Initial Dll directory: '', current directory: 'c:\windows\system32\inetsrv'
[aspnetcorev2_inprocess.dll] Setting dll directory to c:\windows\system32\inetsrv
[aspnetcorev2_inprocess.dll] Setting current directory to C:\inetpub\wwwroot\<AppName>\
[aspnetcorev2_inprocess.dll] Event Log: 'Application '/LM/W3SVC/1/ROOT/<AppName>' with physical root 'C:\inetpub\wwwroot\<AppName>\' failed to load coreclr. Exception message:
Error occured when initializing inprocess application, Return code: 0x80008083'
End Event Log Message.
[aspnetcorev2_inprocess.dll] InvalidOperationException 'Error occured when initializing inprocess application, Return code: 0x80008083' caught at F:\workspace\_work\1\s\src\Servers\IIS\AspNetCoreModuleV2\InProcessRequestHandler\inprocessapplication.cpp:346
[aspnetcorev2_inprocess.dll] Stopping in-process worker thread
[aspnetcorev2_inprocess.dll] Stopping CLR
[aspnetcorev2_inprocess.dll] Event Log: 'Application '/LM/W3SVC/1/ROOT/<AppName>' with physical root 'C:\inetpub\wwwroot\<AppName>\' failed to load coreclr. Exception message:
CLR worker thread exited prematurely'
End Event Log Message.
[aspnetcorev2_inprocess.dll] InvalidOperationException 'CLR worker thread exited prematurely' caught at F:\workspace\_work\1\s\src\Servers\IIS\AspNetCoreModuleV2\InProcessRequestHandler\inprocessapplication.cpp:407
[aspnetcorev2_inprocess.dll] Failed HRESULT returned: 0x8007023e at F:\workspace\_work\1\s\src\Servers\IIS\AspNetCoreModuleV2\InProcessRequestHandler\dllmain.cpp:131
[aspnetcorev2_inprocess.dll] Starting app_offline monitoring in application 'C:\inetpub\wwwroot\<AppName>\'
[aspnetcorev2_inprocess.dll] Starting file watcher thread
这是我的Program.cs文件：
public static void Main(string[] args)
{
Directory.SetCurrentDirectory(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location));
XmlDocument log4netConfig = new XmlDocument();
log4netConfig.Load(File.OpenRead("log4net.config"));
ILoggerRepository repo = log4net.LogManager.CreateRepository(
Assembly.GetEntryAssembly(),
typeof(log4net.Repository.Hierarchy.Hierarchy));
log4net.Config.XmlConfigurator.Configure(repo, log4netConfig["log4net"]);
CreateHostBuilder(args).Build().Run();
}
public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
.ConfigureWebHostDefaults(webBuilder =>
{
webBuilder.UseIIS();
webBuilder.UseStartup<Startup>();
});
以下是我的Startup.cs的重要部分。
public void ConfigureServices(IServiceCollection services)
{
services.AddOptions();
services.AddScoped<INotifyService, NotifyService>();
services.AddControllers().AddNewtonsoftJson();
// Authentication and CORS settings
services.AddSignalR().AddNewtonsoftJsonProtocol();
}
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
app.ConfigureExceptionHandler();
app.UseRouting();
app.UseStaticFiles();
app.UseCors("CorsPolicy");
app.UseAuthentication();
app.UseAuthorization();
app.UseHttpsRedirection();
app.UseEndpoints(endpoints =>
{
endpoints.MapHub<NotifyHub>("/notify");
endpoints.MapControllerRoute("default", "{controller=Home}/{action=Index}");
});
app.UseDefaultFiles();
}
我认为事件查看器中的.NET Core版本是关键，但我无法强制其使用3.1版本。
更新 - 添加.csproj文件信息
我的.csproj文件的相关部分如下：
<PropertyGroup>
<TargetFramework>netcoreapp3.1</TargetFramework>
</PropertyGroup>
<PropertyGroup>
<RuntimeFrameworkVersion>3.1.0</RuntimeFrameworkVersion>
<PlatformTarget>AnyCPU</PlatformTarget>
<RuntimeIdentifier>win-x64</RuntimeIdentifier>
</PropertyGroup>