C# 调用"Trace"功能(调试时实用）

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 using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Diagnostics;
 
 abstract class Maths
{
   public abstract int sum(int x ,int y);
}
 
 
 class ArithmeticOperation : Maths
{
    public override int sum(int x, int y) 
    {
          return (x+y);
    }
}
 
namespace WindowsFormsApplication2
{
    static class Program
    {
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        {
            ArithmeticOperation temp = new ArithmeticOperation();
            int a=temp.sum(100, 100);
 
 
         //  Trace.Listeners.Clear();
           bool someBool = true;
           Trace.Listeners.Add(new TextWriterTraceListener(@"D:\MyListener.log")); 
           Trace.AutoFlush = true;//每次写入日志后是否都将其保存到磁盘中
 
           Trace.WriteLine(DateTime.Now.ToString() + "--Enter function LogTest");
           Trace.Indent(); //缩进+1
           Trace.WriteLine("This is indented once");
           Trace.Indent();
           Trace.WriteLineIf(someBool, "Only written if someBool is true");
           Trace.Unindent(); //缩进-1
           Trace.Unindent();
           Trace.WriteLine("Leave function LogTest");
           Trace.Flush();//立即输出
 
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
    }
}