改善C#编程的50个建议(21-25)

// For illustration, not complete source
public class List<T> : IEnumerable<T>
{
    private class Enumerator<T> : IEnumerator<T>
    {
        // Contains specific implementation of
        // MoveNext(), Reset(), and Current.
        public Enumerator(List<T> storage)
        {
            // elided
        }
    }
    public IEnumerator<T> GetEnumerator()
    {
        return new Enumerator<T>(this);
    }
    // other List members.
}

public interface IPhoneValidator
{
  bool ValidateNumber(PhoneNumber ph);
}
internal class USPhoneValidator : IPhoneValidator
{
	public bool ValidateNumber(PhoneNumber ph)
	{
	  // perform validation.
	  // Check for valid area code, exchange.
	  return true;
	}
}

    public static class Extensions
   {
	public static void ForAll<T>(
		this IEnumerable<T> sequence,
		Action<T> action)
	{
		foreach (T item in sequence)
		action(item);
	}
   }
        // usage
foo.ForAll((n) => Console.WriteLine(n.ToString()));

public struct URLInfo : IComparable<URLInfo>, IComparable
{
    private string URL;
    private string description;
    #region IComparable<URLInfo> Members
    public int CompareTo(URLInfo other)
    {
        return URL.CompareTo(other.URL);
    }
    #endregion
    #region IComparable Members
    int IComparable.CompareTo(object obj)
    {
        if (obj is URLInfo)
        {
            URLInfo other = (URLInfo)obj;
            return CompareTo(other);
        }
        else
            throw new ArgumentException(
            "Compared object is not URLInfo");
    }
    #endregion
}

interface IMsg
{
    void Message();
}
public class MyClass : IMsg
{
    public void Message()
    {
        Console.WriteLine("MyClass");
    }
}

public class MyDerivedClass : MyClass
{
    public void Message()
    {
        Console.WriteLine("MyDerivedClass");
    }
}

    public class MyClass : IMsg
    {
        public virtual void Message()
        {
            Console.WriteLine("MyClass");
        }
    }
    public class MyDerivedClass : MyClass
    {
        public override void Message()
        {
            Console.WriteLine("MyDerivedClass");
        }
    }

    public class MyDerivedClass2 : MyClass
    {
        public sealed override void Message()
        {
            Console.WriteLine("MyDerivedClass");
        }
    }

    public class MyClass2 : IMsg
    {
        protected virtual void OnMessage()
        {
        }
        public void Message()
        {
            OnMessage();
            Console.WriteLine("MyClass");
        }
    }

    public class DefaultMessageGenerator
    {
        public void Message()
        {
            Console.WriteLine("This is a default message");
        }
    }
    public class AnotherMessageGenerator :
    DefaultMessageGenerator, IMsg
    {
        // No explicit Message() method needed.
    }

public class LoggerEventArgs : EventArgs
    {
        public string Message { get; private set; }
        public int Priority { get; private set; }
        public LoggerEventArgs(int p, string m)
        {
            Priority = p;
            Message = m;
        }
    }
    public class Logger
    {
        static Logger()
        {
            theOnly = new Logger();
        }
        private Logger()
        {
        }
        private static Logger theOnly = null;
        public static Logger Singleton
        {
            get { return theOnly; }
        }
        // Define the event:
        public event EventHandler<LoggerEventArgs> Log;
        // add a message, and log it.
        public void AddMsg(int priority, string msg)
        {
            // This idiom discussed below.
            EventHandler<LoggerEventArgs> l = Log;
            if (l != null)
                l(this, new LoggerEventArgs(priority, msg));
        }
    }

    class ConsoleLogger
    {
        static ConsoleLogger()
        {
            Logger.Singleton.Log += (sender, msg) =>
            {
                Console.Error.WriteLine("{0}:\t{1}",
                msg.Priority.ToString(),
                msg.Message);
            };
        }
    }

改善C#编程的50个建议(21-25),布布扣,bubuko.com

改善C#编程的50个建议(21-25)

原文：http://blog.csdn.net/edcvf3/article/details/22760061