ch2_10.cs

《c#技术内幕代码》

using System;

public interface ILog
{
    int OpenLogFile( string fileName );
    int CloseLogFile();
    void LogString( string strToLog );
}

public class MyLog : ILog
{
    public int OpenLogFile( string fileName )
    {
       Console.WriteLine("Opening File {0}", fileName );
       return 0;
    }
    public int CloseLogFile()
    {
       Console.WriteLine("Closing log file");
       return 0;
    }
    public void LogString( string strToLog )
    {
       Console.WriteLine("Logging String {0}", strToLog );
    }
}   

class CH2_10
{
    public static void Main()
    {
       MyLog app = new MyLog();
       app.OpenLogFile("AFile");
       app.LogString("Hello world");
       app.CloseLogFile();
    }
}