c# - Application Insights 不显示 Trace.TraceInformation 消息

Question

我有一个 .net 核心 Web API 项目。我只是想让我的跟踪语句如下所示出现在应用洞察中:

Trace.TraceInformation("Hello World!");

我在调试时在输出窗口中看到日志，但在部署后，我在日志中看不到任何跟踪语句....为什么？

我有 Microsoft.ApplicationInsights.AspNetCore 和 Microsoft.ApplicationInsights.TraceListener 包。

我知道 App insights 已设置，因为请求正在出现，并且我从未收集的性能指标中收到一条跟踪消息(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 包后，它会为 .NET 完整版添加以下部分:

<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，所以看起来需要注册 ApplicationInsightsTraceListener:

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

这是完整的控制台应用程序(应该也适用于其他类型)，它捕获所有三个跟踪(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();
        }
    }
}