如何在Web Core API中调试启动？

Question

我有一个使用Web Core API的MVC网站.在进行了微小的更改和部署之后,我意外地收到了错误; 响应状态代码不表示成功:500(内部服务器错误).所以我启用了Web Core API的日志文件(请参阅https://docs.microsoft.com/en-us/aspnet/core/host-and-deploy/iis/troubleshoot?view=aspnetcore-2.0#aspnet-core -module-stdout-log)我收到此错误消息;

应用程序启动异常:System.Collections.Generic.KeyNotFoundException:给定的键不存在于字典中.Microsoft.AspNetCore.Mvc.Internal.DefaultAssemblyPartDiscoveryProvider.CandidateResolver.ComputeClassification(String依赖项)中的Microsoft.AspNetCore.Mvc.Internal.DefaultAssemblyPartDiscoveryProvider.CandidateResolver.ComputeClassification(String依赖项)中的System.Collections.Generic.Dictionary2.get_Item(TKey键)在Microsoft.AspNetCore.Mvc.Internal.DefaultAssemblyPartDiscoveryProvider.CandidateResolver.ComputeClassification(字符串依赖)在Microsoft.AspNetCore.Mvc.Internal.DefaultAssemblyPartDiscoveryProvider.CandidateResolver.d__4.MoveNext()在System.Linq.Enumerable.d__172.MoveNext()在系统.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()at Microsoft.Extensions.DependencyInject.MvcCoreServiceCollectionExtensions.GetApplicationPartManager(IServiceCollection services)at Microsoft.Extensions.DependencyInjection.MvcCoreServiceCollectionExtensions.AddMvcCore(IServiceCollection services)at Properties.API.Startup.ConfigureServices(IServiceCollection) SER 恶意)---抛出异常的前一个位置的堆栈跟踪结束---在Microsoft.AspNetCore的Microsoft.AspNetCore.Hosting.ConventionBasedStartup.ConfigureServices(IServiceCollection服务)的System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()处. Microsoft.AspNetCore.Hosting.Internal.WebHost.BuildApplication()中的Hosting.Internal.WebHost.EnsureApplicationServices()主机环境:暂存内容根路径:C:\ inetpub\wwwroot\SIR现在正在侦听:http:// localhost:33007申请开始了.按Ctrl + C关闭.

更新:它倒下的线是;

services.AddMvcCore()AddJsonFormatters();

在ConfigureServices中.

我如何调试它以找出导致这种情况的原因？

public class Startup {
 public Startup(IHostingEnvironment env) {
  var builder = new ConfigurationBuilder()
   .SetBasePath(env.ContentRootPath)
   .AddJsonFile("appSettings.json", optional: false, reloadOnChange: true)
   .AddJsonFile($ "appSettings.{env.EnvironmentName}.json", optional: true, reloadOnChange: true)
   .AddEnvironmentVariables();

  Configuration = builder.Build();
 }

.
.
.

    public void ConfigureServices(IServiceCollection services)
    {
        services.AddCors();
        services.AddMvcCore().AddJsonFormatters();
        services.Configure<IISOptions>(options => new IISOptions
        {
            AutomaticAuthentication = true,
            ForwardClientCertificate = false,
            ForwardWindowsAuthentication = false
        });

        var connectionStringMSurveyV2 = Configuration.GetConnectionString("MSurveyV2Db");
        services.AddScoped<MSurveyV2Db>(_ => new MSurveyV2Db(connectionStringMSurveyV2));
        var connectionStringSir = Configuration.GetConnectionString("SirDb");
        services.AddScoped<SirDb>(_ => new SirDb(connectionStringSir));
        services.AddScoped<IPropertiesRepo, PropertiesRepo>();
        services.AddScoped<ISirUoW, SirUoW>();
        services.AddScoped<IPropertyUoW, PropertyUoW>();
        services.AddScoped<Services.IMailService, Services.MailService>();
    }

...

Answer 1

您没有说明您正在使用哪个版本的 ASP.NET Core。如果是2.0+，可以配置NLogProgram.cs在启动前加载：

public static class Program
{
    public static void Main(string[] args)
    {
        var logger = NLogBuilder.ConfigureNLog("nlog.config").GetCurrentClassLogger();

        try
        {
            var config = new ConfigurationBuilder()
                    .SetBasePath(Directory.GetCurrentDirectory())
                    .AddJsonFile("hosting.json", optional: true)
                    .Build();

            BuildWebHost(args, config).Run();
        }
        catch (System.Exception ex)
        {
            logger.Error(ex, "An error occurred during program startup");
            throw;
        }
    }

    private static IWebHost BuildWebHost(string[] args, IConfigurationRoot config)
    {
        return WebHost.CreateDefaultBuilder(args)
            .UseConfiguration(config)
            .UseStartup<Startup>()
            .UseNLog()
            .Build();
    }
}