using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IO; namespace evnt { public class myclass { public delegate void LogHandler(string msg); public event LogHandler Log; public void process() { OnLog("Process() begin"); OnLog("Process() end"); } protected void OnLog(string message) { if (Log != null) { Log(message); } } } public class FileLogger { FileStream filestream; StreamWriter streamwriter; public FileLogger(string filename) { filestream = new FileStream(filename,FileMode.Create); streamwriter = new StreamWriter(filestream); } public void Logger(string s) { streamwriter.WriteLine(s); } public void close() { streamwriter.Close(); filestream.Close(); } } public class testapplication { static void Logger(string s) { Console.WriteLine(); } } class Program { static void Main(string[] args) { FileLogger f1 = new FileLogger("process.log"); myclass mc = new myclass(); mc.Log += new myclass.LogHandler(Logger); mc.Log += new myclass.LogHandler(f1.Logger); mc.process(); f1.close(); } } }
FileLogger
var
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