Question

我有一个问题。我在.net core 2.2中有一个Web API，它在Linux ubuntu 18.04 os下运行。

要在服务器重新启动时启动此服务，请将此过程放入rc.local文件中（例如，这是那里的唯一记录，api仅使用数据库，而没有其他内容）

但是当服务器要启动Web API时，在服务器重启时，我遇到了异常：

 Unhandled Exception: System.IO.IOException: Invalid argument
  at System.IO.Enumeration.FileSystemEnumerator`1.FindNextEntry()
  at System.IO.Enumeration.FileSystemEnumerator`1.MoveNext()
  at System.IO.FileSystemWatcher.RunningInstance.AddDirectoryWatchUnlocked(WatchedDirectory parent, String directoryName)
message repeated 5 times: [    at System.IO.FileSystemWatcher.RunningInstance.AddDirectoryWatchUnlocked(WatchedDirectory parent, String directoryName)]
  at System.IO.FileSystemWatcher.RunningInstance..ctor(FileSystemWatcher watcher, SafeFileHandle inotifyHandle, String directoryPath, Boolean includeSubdirectories, NotifyFilters notifyFilters, CancellationToken cancellationToken)
  at System.IO.FileSystemWatcher.StartRaisingEvents()
  at System.IO.FileSystemWatcher.StartRaisingEventsIfNotDisposed()
  at System.IO.FileSystemWatcher.set_EnableRaisingEvents(Boolean value)
  at Microsoft.Extensions.FileProviders.Physical.PhysicalFilesWatcher.TryEnableFileSystemWatcher()
  at Microsoft.Extensions.FileProviders.Physical.PhysicalFilesWatcher.CreateFileChangeToken(String filter)
  at Microsoft.Extensions.Primitives.ChangeToken.OnChange(Func`1 changeTokenProducer, Action changeTokenConsumer)
  at Microsoft.Extensions.Configuration.FileConfigurationProvider..ctor(FileConfigurationSource source)
  at Microsoft.Extensions.Configuration.Json.JsonConfigurationSource.Build(IConfigurationBuilder builder)
  at Microsoft.Extensions.Configuration.ConfigurationBuilder.Build()
  at Microsoft.AspNetCore.Hosting.WebHostBuilder.BuildCommonServices(AggregateException& hostingStartupErrors)
  at Microsoft.AspNetCore.Hosting.WebHostBuilder.Build()
  at LiveServer.WebApi.Program.BuildWebHost(String[] args) in /mnt/c/Workspace/Playground/LiveServer/LiveServer.WebApi/Program.cs:line 15
  at LiveServer.WebApi.Program.Main(String[] args) in /mnt/c/Workspace/Playground/LiveServer/LiveServer.WebApi/Program.cs:line 11

因此，在mu程序cs中看起来好像有问题，并且看起来是：

 public class Program
 {
    private static Logger logger = LogManager.GetLogger("Startup");

    public static void Main(string[] args)
    {
        BuildWebHost(args).Run();
    }

    public static IWebHost BuildWebHost(string[] args)
    {
        try
        {
            return WebHost.CreateDefaultBuilder(args)
                .UseUrls(GetWebApiUrl())
                .UseKestrel()
                .UseStartup<Startup>()
                .Build();
        }
        catch (Exception ex)
        {
            var msg = $"Error while starting WebApi: Error - {ex.Message} Inner Error - {ex.InnerException.Message} Stack - {ex.StackTrace} InnerStack {ex.InnerException.Message}";
            logger.Fatal(msg);
            throw new Exception(msg);
        }

    }

    private static string GetWebApiUrl()
    {
        var assemblyPathInfo = new FileInfo(Assembly.GetEntryAssembly()?.Location ?? throw new InvalidOperationException());
        var configurationFilePath = Path.Combine(assemblyPathInfo.DirectoryName, "appsettings.json");

        var config = new ConfigurationBuilder().AddJsonFile(configurationFilePath, optional: false).Build();
        var webApiUrl = config["WebApi:URL"];
        return webApiUrl;
    }
}

appsettings.json如下：

{
  "Logging": {
    "IncludeScopes": false,
    "Debug": {
      "LogLevel": {
        "Default": "Warning"
      }
    },
    "Console": {
      "LogLevel": {
        "Default": "Warning"
      }
    }
  },
  "WebApi": {
    "URL": "http://*:5001"
  }
}

我可以推断出某些东西阻止了json设置文件，但我可能是错的。但是有趣的是，当我通过dot net命令手动运行此服务器时，或者在服务器启动后通过启动rc.local文件运行它时，都没有问题。

异常：使用rc.local启动WebApi时出现System.IO.IOException

0 个答案: