EmployeeDetail a,b;

....

EmployeeCollection collection = a+b;

[Serializable]
 public class EmployeeDetail
 {
   public string FirstName { get; set; }
   public string MiddleName { get; set; }
   public string LastName { set;get; }
   public override string ToString()
   {
     return string.Format("{0}{1}{2}{3}{4}", FirstName, string.IsNullOrWhiteSpace(MiddleName) ? null : "."
       , MiddleName
       , string.IsNullOrWhiteSpace(LastName) ? null : ".",
       LastName).Trim();
   }
 }

public static EmployeeCollection operator +(EmployeeDetail a, EmployeeDetail b)
{
  return new EmployeeCollection() { a, b };
}

EmployeeCollection collection = new EmployeeDetail(){FirstName="Jackson",LastName="Bruce"} + new EmployeeDetail(){FirstName="Michael",LastName="Jackson"} ;

EmployeeCollection collection = a + b + c;

public static EmployeeCollection operator +(EmployeeCollection collection, EmployeeDetail a)
{
  collection.Add(a);
  return collection;
}
public static EmployeeCollection operator +(EmployeeDetail a, EmployeeCollection collection)
{
  return collection + a;
}

/// <summary>
/// 隐式类型转换
/// </summary>
/// <param name="name"></param>
/// <returns></returns>
public static implicit operator EmployeeDetail(string name)
{
　　　　　　　/// 其实在这里可以写一个正则表达式检查name的字符串格式是否合法，如果不合法就抛出异常
　　　　　　　///
  string[] arr;
  return string.IsNullOrWhiteSpace(name) ? null :
 new EmployeeDetail()
 {
   FirstName = (arr = name.Trim().Split('.'))[0]
   ,
   LastName = arr.Length > 1 ? arr[arr.Length > 2 ? 2 : 1] : null,
   MiddleName = arr.Length > 2 ? arr[1] : null
 };
}
public static EmployeeCollection operator +(EmployeeDetail a, string b)
{
  return new EmployeeCollection() { a, b };
}

static void Main(string[] args)
{
  EmployeeDetail employee = "Jackson.Bruce";
  Console.WriteLine("FirstName={0},MiddleNam={1},LastName={2}", employee.FirstName, employee.MiddleName, employee.LastName);
  Console.WriteLine("toString={0}", employee);
  Console.WriteLine();

  EmployeeCollection collection = "Michael.Jackson" + employee;

  collection += "Bruce.Lee";
  foreach (var e in collection)
  {
 Console.WriteLine(e);
  }
  Console.WriteLine();

  collection -= employee;

  foreach (var e in collection)
  {
 Console.WriteLine(e);
  }
  Console.WriteLine("===end===");
  Console.Read();
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace 重载运算符
{
  [Serializable]
  public class EmployeeDetail
  {
    public string FirstName { get; set; }
    public string MiddleName { get; set; }
    public string LastName { set;get; }
    public static EmployeeCollection operator +(EmployeeDetail a, EmployeeDetail b)
    {
      return new EmployeeCollection() { a, b };
    }

   
    
    public static EmployeeCollection operator +(EmployeeCollection collection, EmployeeDetail a)
    {
      collection.Add(a);
      return collection;
    }
    public static EmployeeCollection operator +(EmployeeDetail a, EmployeeCollection collection)
    {
      return collection + a;
    }
    /// <summary>
    /// 隐式类型转换
    /// </summary>
    /// <param name="name"></param>
    /// <returns></returns>
    public static implicit operator EmployeeDetail(string name)
    {
      string[] arr;
      return string.IsNullOrWhiteSpace(name) ? null :
        new EmployeeDetail()
        {
          FirstName = (arr = name.Trim().Split('.'))[0]
          ,
          LastName = arr.Length > 1 ? arr[arr.Length > 2 ? 2 : 1] : null,
          MiddleName = arr.Length > 2 ? arr[1] : null
        };
    }
    public static EmployeeCollection operator +(EmployeeDetail a, string b)
    {
      return new EmployeeCollection() { a, b };
    }
    public override string ToString()
    {
      return string.Format("{0}{1}{2}{3}{4}", FirstName, string.IsNullOrWhiteSpace(MiddleName) ? null : "."
        , MiddleName
        , string.IsNullOrWhiteSpace(LastName) ? null : ".",
        LastName).Trim();
    }
  }
  public class EmployeeCollection : List<EmployeeDetail>
  {
    public static EmployeeCollection operator +(EmployeeCollection a, string b)
    {
      a.Add(b);
      return a;
    }
    public static EmployeeCollection operator +(string b, EmployeeCollection a)
    {
      return a + b;
    }

    public static EmployeeCollection operator -(EmployeeCollection a, EmployeeDetail b)
    {
      a.Remove(b);
      return a;
    }
  }

  class Program
  {
    static void Main(string[] args)
    {
      EmployeeDetail employee = "Jackson.Bruce";
      Console.WriteLine("FirstName={0},MiddleNam={1},LastName={2}", employee.FirstName, employee.MiddleName, employee.LastName);
      Console.WriteLine("toString={0}", employee);
      Console.WriteLine();

      EmployeeCollection collection = "Michael.Jackson" + employee;

      collection += "Bruce.Lee";
      foreach (var e in collection)
      {
        Console.WriteLine(e);
      }
      Console.WriteLine();

      collection -= employee;

      foreach (var e in collection)
      {
        Console.WriteLine(e);
      }


      Console.WriteLine("===end===");
      Console.Read();
    }
  }
}