Microsoft.Extensions.Hosting.HostFactoryResolver+HostingListener+StopTheHostException

Posted 2023-03-31

【中文标题】Microsoft.Extensions.Hosting.HostFactoryResolver+HostingListener+StopTheHostException

【英文标题】：

【发布时间】：2021-12-06 14:35:52

【问题描述】：

我正在使用 Asp.Net Core Web Api 6

我在迁移 DbContext 和更新数据库时遇到错误

错误

[17:07:29 INF] Application Is Starting
[17:07:29 FTL] Application terimnated unexpectedly
: Exception of type '' was thrown.
   at Microsoft.Extensions.Hosting.HostFactoryResolver.HostingListener.OnNext(KeyValuePair`2 value)
   at System.Diagnostics.DiagnosticListener.Write(String name, Object value)
   at Microsoft.Extensions.Hosting.HostBuilder.Build()
   at Microsoft.AspNetCore.Builder.WebApplicationBuilder.Build()
   at Program.<Main>$(String[] args) in C:\...\Program.cs:line 44

但它不影响迁移过程和更新数据库

因此，我的问题是，

如何解决 这会影响以后的项目吗？

程序.cs

Log.Information("Application Is Starting");

    var builder = WebApplication.CreateBuilder(args);

    // Full setup of serilog. We read log settings from appsettings.json
    builder.Host.UseSerilog((context, services, configuration) => configuration
        .ReadFrom.Configuration(context.Configuration)
        .ReadFrom.Services(services)
        .Enrich.FromLogContext());


    // Add services to the container.
    builder.Services.AddDbContext<LocalDbContext>(options =>
        options.UseSqlServer(builder.Configuration.GetConnectionString("localConnection"))
    );

    builder.Services.AddControllers();
    builder.Services.AddCors(options =>
    
        options.AddPolicy("AllowAll", builder =>
            builder
                .AllowAnyOrigin()
                .AllowAnyMethod()
                .AllowAnyHeader()
            );
    );
    // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
    builder.Services.AddEndpointsApiExplorer();
    builder.Services.AddSwaggerGen();

    var app = builder.Build();

    app.UseSerilogRequestLogging(configure =>
    
        configure.MessageTemplate = "HTTP RequestMethod RequestPath (UserId) responded StatusCode in Elapsed:0.0000ms";
    );

    // Configure the HTTP request pipeline.
    if (app.Environment.IsDevelopment())
    
        app.UseSwagger();
        app.UseSwaggerUI();
    

    app.UseCors("AllowAll");

    app.UseHttpsRedirection();

    app.UseAuthorization();

    app.MapControllers();

    app.Run();

【问题讨论】：

顺便说一句，这似乎是 .NET 6 docs.microsoft.com/en-us/dotnet/core/compatibility/…

中的重大变化

【参考方案1】：

在任何 .NET/EF Core 6.0 RC2 项目中围绕 IHostBulder.Build() 添加与上述类似的 try/catch，并尝试添加迁移可以重现该问题。

我们可以通过以下方式解决问题：

catch (Exception ex)

   string type = ex.GetType().Name;
   if (type.Equals("StopTheHostException", StringComparison.Ordinal))
   
      throw;
   

   _logger.Fatal(ex, "Unhandled exception");
   return 1;

有关此问题的更多详细信息，您可以参考这篇文章。

StopTheHostException should be made public to be dealt with gracefully #60600