Question

我正在将ASP.Net应用程序迁移到ASP.Net Core。主要设置NLog可以正常工作。现在，我想将会话ID与日志消息一起记录。为此，我添加了 -Microsoft.AspNetCore.Session -NLog.Web.AspNetCore 来自NuGet。

在“启动”中激活了会话，我在代码中获得了会话ID。

在Startup.cs中的NLog on GitHub之后应添加

//add NLog.Web
app.AddNLogWeb();

这没有任何意义，因为该方法已标记为过时。

但是，无论该行与否，NLog都不向日志文件生成正确的输出。仅记录以下内容：

2018-12-03 09:59:42.6111 Warn Exception in layout renderer. Exception: System.InvalidOperationException: Session has not been configured for this application or request.
   at Microsoft.AspNetCore.Http.DefaultHttpContext.get_Session()
   at NLog.Web.LayoutRenderers.AspNetSessionIdLayoutRenderer.DoAppend(StringBuilder builder, LogEventInfo logEvent)
   at NLog.LayoutRenderers.LayoutRenderer.RenderAppendBuilder(LogEventInfo logEvent, StringBuilder builder)

目标配置如下：

    <target archiveAboveSize="10000000" 
        xsi:type="File" 
        fileName="${basedir}/logs/SystemOut.log" 
        archiveFileName="${basedir}/logs/SystemOut_${shortdate}.{#}.log" 
        archiveEvery="Day" 
        archiveNumbering="Rolling" 
        maxArchiveFiles="50" 
        layout="[${date:format=dd\.MM\.yyyy\-HH\:mm\:ss}] [${level}] [${callsite}] [${aspnet-sessionid}] [Client:${event-context:item=clientId}] [User:${aspnet-user-identity}] Url: ${aspnet-request-url} Action: ${aspnet-mvc-action} ${message} ${exception}" 
        autoFlush="true" 
        name="sysout" />

这是Startup.cs的内容：

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    // This method gets called by the runtime. Use this method to add services to the container.
    public void ConfigureServices(IServiceCollection services)
    {
        services.Configure<CookiePolicyOptions>(options =>
        {
            // This lambda determines whether user consent for non-essential cookies is needed for a given request.
            options.CheckConsentNeeded = context => true;
            options.MinimumSameSitePolicy = SameSiteMode.None;
        });

        services.AddDistributedMemoryCache();
        services.AddSession(options =>
        {
            options.IdleTimeout = TimeSpan.FromMinutes(120);
            options.Cookie.HttpOnly = true;
        });

        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        else
        {
            app.UseExceptionHandler("/Home/Error");
            app.UseHsts();
        }

        app.UseHttpsRedirection();
        app.UseStaticFiles();
        app.UseCookiePolicy();
        app.UseSession();

        app.UseMvc(routes =>
        {
            routes.MapRoute(
                name: "default",
                template: "{controller=Home}/{action=Index}/{id?}");
        });
    }
}

我的配置中缺少什么？

Answer 1

更新

您的问题还表明，您可能遵循了错误的“入门指南”，因为调用app.AddNLogWeb();仅适用于Asp.Net Core 1 ，而您很有可能使用版本 2 。请参考文档的正确部分：

原始答案

错误很明显是自言自语。您尚未将应用程序配置为使用会话。

在您的Startup.cs-ConfigureServices()方法中，添加以下行：

public void ConfigureServices(IServiceCollection services)
{
     /*other config...*/
     services.AddSession();
}

然后在Configure()方法中添加以下内容：

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{

    app.UseHttpsRedirection();
    app.UseStaticFiles();
    app.UseCookiePolicy();
    app.UseSession(); //<--- add this line
    app.UseHttpContextItemsMiddleware();
    app.UseMvc();
}

这应该可以解决该异常。

这是文档中的说明：https://docs.microsoft.com/en-us/aspnet/core/fundamentals/app-state?view=aspnetcore-2.1

Answer 2

如果完全不可能使用在UseNLog中调用Program.cs的推荐方法：

https://github.com/NLog/NLog.Web/wiki/Getting-started-with-ASP.NET-Core-2#4-update-programcs

然后，您也可以执行以下操作：

using Microsoft.Extensions.DependencyInjection;
using NLog.Extensions.Logging;
using NLog.Web;

public class Startup
{
  // This method gets called by the runtime. Use this method to add services to the container.
  public void ConfigureServices(IServiceCollection services)
  {
    services.AddMvc();
    services.AddSession(); // After AddMvc()
    services.AddHttpContextAccessor();
  }

  // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
  public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
  {
    app.UseSession();  // Before UseMvc()
    app.UseMvc();
    app.ApplicationServices.SetupNLogServiceLocator();
    loggerFactory.AddNLog();
  }
}

另请参阅http://www.jiodev.com/aspnet/core/fundamentals/app-state

Answer 3

选中以放入Startup.cs

// Configure Method
app.UseRouting();


// AppService Method
services.AddDistributedMemoryCache();
services.AddSession();

aspnet-sessionId不适用于Asp.Net Core

3 个答案: