lambda表达式进行对象结合操作的实例详解

1publicclass Person : BaseDomain 2    { 3long _id; 4string firstName; 5string secondName; 6string comments; 7 8public Person() 9        {}1011public Person(long id)12        {13this._id = id;14        }15public Person(long id,string firstName, string secondName)16        {17this._id = id;18this.firstName = firstName;19this.secondName = secondName;20             comments = String.Empty;21        }22public Person(long id,string firstName, string secondName, string comments)23             : this(id,firstName, secondName)24        {25this.comments = comments;26        }2728publicstring FirstName29        {30get { return firstName; }31set { firstName = value; }32        }33publicstring SecondName34        {35get { return secondName; }36set { secondName = value; }37        }38publicstring Comments39        {40get { return comments; }41set { comments = value; }42        }43publicoverridestring ToString()44        {45returnstring.Format("FirstName: {0}\tSecondName: {1}\tComment: {2}", this.firstName, this.secondName, this.comments);46        }47     }

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上面是测试需要的简单类型：Person

1var list = new List<Person>(5); 2     list.Add(new Person(1,"咬金","程","拿斧子砍人的那个家伙"); 3     list.Add(new Person(2,"咬金","程","拿斧子砍人的那个家伙"); 4     list.Add(new Person(3,"貂蝉","王","3技能很厉害哦"); 5     list.Add(new Person(4,"昭君","李","适合打团战"); 6     list.Add(new Person(5,"亚瑟","毛","狠狠厚的肉")； 7 8//进行去重操作，需要先引入linq引用"using System.Linq; " 9var result_list = list.GroupBy(obj=>obj.FirstName).Select(g=>g.First()).ToList();1011foreach(var item in result_list)12    {13        Console.WriteLine(item);14     }

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