Creating an interface. : interface « Class « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Class
3. interface

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