c# – 如何在通用应用程序中禁用任务并行库的ETW事件源？

一种可能的解决方法是禁用TPL的ETW EventSource.

如果我真的想要如何在通用Windows应用程序中禁用它？

反射适用于桌面应用程序,但不适用于WP / WinRT应用程序. EventCommand.Disable未被识别为EventSource.SendCommand的有效命令(尽管它在ETW内部使用).这是要使用的代码(作为控制台应用程序)：

using System;
using System.Threading.Tasks;
using System.Diagnostics.Tracing;
using System.Reflection;

namespace ConsoleApplication
{
    class Program
    {
        internal class MyEventListener : EventListener
        {
            protected override void OnEventSourceCreated(EventSource eventSource)
            {
                Console.WriteLine(eventSource);
                base.OnEventSourceCreated(eventSource);
                if (eventSource.Name == "System.Threading.Tasks.TplEventSource")
                {
                    Console.WriteLine("enabled: " + eventSource.IsEnabled());

                    // trying to disable with EventCommand.Disable: Invalid command
                    try
                    {
                        System.Diagnostics.Tracing.EventSource.SendCommand(
                            eventSource,EventCommand.Disable,new System.Collections.Generic.Dictionary<string,string>());
                        Console.WriteLine("enabled: " + eventSource.IsEnabled());
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine(ex.Message);
                    }

                    // reflection: doesn't work for Windows Phone/Store apps
                    try
                    {
                        var ti = typeof(EventSource).GetTypeInfo();
                        var f = ti.GetDeclaredField("m_eventSourceEnabled");
                        f.SetValue(eventSource,false);
                        Console.WriteLine("enabled: " + eventSource.IsEnabled());
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine(ex.Message);
                    }
                }
            }

            protected override void OnEventWritten(EventWrittenEventArgs eventData)
            {
                Console.WriteLine(eventData);
            }
        }

        static MyEventListener listener = new MyEventListener();

        static void Main(string[] args)
        {
            Task.Delay(1000).Wait();
            Console.ReadLine();
        }
    }
}

对于通用应用程序,可以将MyEventListener实例化为Application的一部分：

public sealed partial class App : Application
{
    static MyEventListener listener = new MyEventListener();
}