应用程序见解不显示Trace.TraceInformation消息

Question

我有一个.net核心Web API项目。我只是想让我的以下跟踪语句出现在应用程序见解中：

Trace.TraceInformation("Hello World!");

在调试时，我在输出窗口中看到日志，但是在部署后，在日志中没有看到任何跟踪语句。...为什么？

我有和Microsoft.ApplicationInsights.AspNetCore，Microsoft.ApplicationInsights.TraceListener包括包装。

我知道App洞察力已经设置好了，因为正在出现请求，并且我从未收集的性能指标中得到了一条跟踪消息（请参阅下面的跟踪消息）：

AI: Error collecting 3 of the configured performance counters. Please check the configuration.
Counter \ASP.NET Applications(??APP_W3SVC_PROC??)\Requests/Sec: Failed to perform the first read for performance counter. Please make sure it exists. Category: ASP.NET Applications, counter: Requests/Sec, instance MyAPI.exe
Counter \ASP.NET Applications(??APP_W3SVC_PROC??)\Request Execution Time: Failed to perform the first read for performance counter. Please make sure it exists. Category: ASP.NET Applications, counter: Request Execution Time, instance MyAPI.exe
Counter \ASP.NET Applications(??APP_W3SVC_PROC??)\Requests In Application Queue: Failed to perform the first read for performance counter. Please make sure it exists. Category: ASP.NET Applications, counter: Requests In Application Queue, instance 

Answer 1

添加TraceListner程序包后，它将为.NET Full版本添加以下部分：

<system.diagnostics>
    <trace autoflush="true" indentsize="0">
        <listeners>
            <add name="myAppInsightsListener"
                type="Microsoft.ApplicationInsights.TraceListener.ApplicationInsightsTraceListener, Microsoft.ApplicationInsights.TraceListener"/>
        </listeners>
    </trace>
</system.diagnostics>

由于.NET Core没有自动注册，因此看起来就像注册ApplicationInsightsTraceListener一样：

Trace.Listeners.Add(new ApplicationInsightsTraceListener());

这是完整的控制台应用程序（也应适用于其他类型），它捕获了所有三个跟踪（通过TraceError，TraceInformation和TrackTrace）：

using System;
using System.Diagnostics;
using Microsoft.ApplicationInsights;
using Microsoft.ApplicationInsights.Extensibility;
using Microsoft.ApplicationInsights.TraceListener;

namespace CoreConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            TelemetryConfiguration.Active.InstrumentationKey =
                "<your ikey>";

            Console.WriteLine("Hello World!");

            Trace.Listeners.Add(new ApplicationInsightsTraceListener());
            Trace.TraceError("my error");
            Trace.TraceInformation("my information");

            TelemetryClient client = new TelemetryClient();
            client.TrackTrace("Demo application starting up.");

            Console.ReadKey();
        }
    }
}