interface ILog
{
  void Log();
}
 
public class FileLogger : ILog
{
  public void Log()
  {
    Console.WriteLine("记录到文件！");
  }
}

public class EventLogger : ILog
{
  void ILog.Log()
  {
    Console.WriteLine("记录到系统事件！");
  }
}

FileLogger fileLogger = new FileLogger();
fileLogger.Log(); //正确
EventLogger eventLogger = new EventLogger();      
eventLogger.Log(); //报错
ILog log = new EventLogger();
log.Log(); //正确

interface ISendable
{
  void Log();
}
 
public class EmailLogger : ILog, ISendable
{
  void ILog.Log()
  {
    Console.WriteLine("ILog");
  }
 
  void ISendable.Log()
  {
    Console.WriteLine("ISendable");
  }
}

interface IComparable
{
  int CompareTo(object obj);
}
 
struct ValueType : IComparable
{
  private int x;
  public ValueType(int x)
  {
    this.x = x;
  }
 
  public int CompareTo(object obj)
  {
    return this.x - ((ValueType)obj).x;
  }
} 

ValueType vt1 = new ValueType(1);
ValueType vt2 = new ValueType(2);
Console.WriteLine(vt1.CompareTo(vt2));

public int CompareTo(ValueType vt)
{
  return this.x - vt.x;
}
 
int IComparable.CompareTo(object obj)
{
  return CompareTo((ValueType)obj);
} 

IComparable vt1 = new ValueType(1); //装箱
ValueType vt2 = new ValueType(2);
Console.WriteLine(vt1.CompareTo(vt2)); //再次装箱