using System;
using System.IO;
namespace BoilerEventAppl
{
// boiler 类
class Boiler
{
private int temp;
private int pressure;
public Boiler(int t, int p)
{
temp = t;
pressure = p;
}
public int getTemp()
{
return temp;
}
public int getPressure()
{
return pressure;
}
}
// 事件发布器
class DelegateBoilerEvent
{
public delegate void BoilerLogHandler(string status);
// 基于上面的委托定义事件
public event BoilerLogHandler BoilerEventLog;
public void LogProcess()
{
string remarks = "O. K";
Boiler b = new Boiler(100, 12);
int t = b.getTemp();
int p = b.getPressure();
if(t > 150 || t < 80 || p < 12 || p > 15)
{
remarks = "Need Maintenance";
}
OnBoilerEventLog("Logging Info:\n");
OnBoilerEventLog("Temparature " + t + "\nPressure: " + p);
OnBoilerEventLog("\nMessage: " + remarks);
}
protected void OnBoilerEventLog(string message)
{
if (BoilerEventLog != null)
{
BoilerEventLog(message);
}
}
}
// 该类保留写入日志文件的条款
class BoilerInfoLogger
{
FileStream fs;
StreamWriter sw;
public BoilerInfoLogger(string filename)
{
fs = new FileStream(filename, FileMode.Append, FileAccess.Write);
sw = new StreamWriter(fs);
}
public void Logger(string info)
{
sw.WriteLine(info);
}
public void Close()
{
sw.Close();
fs.Close();
}
}
// 事件订阅器
public class RecordBoilerInfo
{
static void Logger(string info)
{
Console.WriteLine(info);
}//end of Logger
static void Main(string[] args)
{
BoilerInfoLogger filelog = new BoilerInfoLogger("e:\\boiler.txt");
DelegateBoilerEvent boilerEvent = new DelegateBoilerEvent();
boilerEvent.BoilerEventLog += new
DelegateBoilerEvent.BoilerLogHandler(Logger);
boilerEvent.BoilerEventLog += new
DelegateBoilerEvent.BoilerLogHandler(filelog.Logger);
boilerEvent.LogProcess();
Console.ReadLine();
filelog.Close();
}//end of main
}//end of RecordBoilerInfo
}
