// Define the TRACE directive, which enables trace output to the 
// Trace.Listeners collection. Typically, this directive is defined
// as a compilation argument.
#define TRACE
using System;
using System.Diagnostics;

public class ConsoleTraceSample
{

    // Define a simple method to write details about the current executing 
    // environment to the trace listener collection.
    public static void WriteEnvironmentInfoToTrace()
    {

        string methodName = "WriteEnvironmentInfoToTrace";

        Trace.Indent();
        Trace.WriteLine(DateTime.Now.ToString() + " - Start of " + methodName);
        Trace.Indent();

        // Write details on the executing environment to the trace output.
        Trace.WriteLine("Operating system: " + System.Environment.OSVersion.ToString());
        Trace.WriteLine("Computer name: " + System.Environment.MachineName);
        Trace.WriteLine("User name: " + System.Environment.UserName);
        Trace.WriteLine("CLR runtime version: " + System.Environment.Version.ToString());
        Trace.WriteLine("Command line: " + System.Environment.CommandLine);

        // Enumerate the trace listener collection and 
        // display details about each configured trace listener.
        Trace.WriteLine("Number of configured trace listeners = " + Trace.Listeners.Count.ToString());

        foreach (TraceListener tl in Trace.Listeners)
        {
            Trace.WriteLine("Trace listener name = " + tl.Name);
            Trace.WriteLine("               type = " + tl.GetType().ToString());
        }

        Trace.Unindent();
        Trace.WriteLine(DateTime.Now.ToString() + " - End of " + methodName);
        Trace.Unindent();
    }

    // Define the main entry point of this class.
    // The main method adds a console trace listener to the collection
    // of configured trace listeners, then writes details on the current
    // executing environment.
    public static void Main(string[] CmdArgs)
    {

        // Write a trace message to all configured trace listeners.
        Trace.WriteLine(DateTime.Now.ToString()+" - Start of Main");

        // Define a trace listener to direct trace output from this method
        // to the console.
        ConsoleTraceListener consoleTracer;

        // Check the command line arguments to determine which
        // console stream should be used for trace output.
        if ((CmdArgs.Length>0)&&(CmdArgs[0].ToString().ToLower().Equals("/stderr")))
            // Initialize the console trace listener to write
            // trace output to the standard error stream.
        {
            consoleTracer = new ConsoleTraceListener(true);
        }
        else
        {
            // Initialize the console trace listener to write
            // trace output to the standard output stream.
            consoleTracer = new ConsoleTraceListener();
        }
        // Set the name of the trace listener, which helps identify this 
        // particular instance within the trace listener collection.
        consoleTracer.Name = "mainConsoleTracer";

        // Write the initial trace message to the console trace listener.
        consoleTracer.WriteLine(DateTime.Now.ToString()+" ["+consoleTracer.Name+"] - Starting output to trace listener.");

        // Add the new console trace listener to 
        // the collection of trace listeners.
        Trace.Listeners.Add(consoleTracer);

        // Call a local method, which writes information about the current 
        // execution environment to the configured trace listeners.
        WriteEnvironmentInfoToTrace();

        // Write the final trace message to the console trace listener.
        consoleTracer.WriteLine(DateTime.Now.ToString()+" ["+consoleTracer.Name+"] - Ending output to trace listener.");

        // Flush any pending trace messages, remove the 
        // console trace listener from the collection,
        // and close the console trace listener.
        Trace.Flush();
        Trace.Listeners.Remove(consoleTracer);
        consoleTracer.Close();

        // Write a final trace message to all trace listeners.
        Trace.WriteLine(DateTime.Now.ToString()+" - End of Main");

        // Close all other configured trace listeners.
        Trace.Close();
    }
}

//引入命名空间
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;


public class MainClass
{
    public static void Main()
    {
        Trace.Listeners.Add(new ConsoleTraceListener());
    }
}