Detailed explanation of examples of object combination operations using lambda expressions

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 FirstName 29 { 30get { return firstName; } 31set { firstName = value; } 32 } 33publicstring SecondName 34 { 35get { return secondName; } 36set { secondName = value; } 37 } 38publicstring Comments 39 { 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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The above is the simple type required for testing: Person

1var list = new List(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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The above introduces the use of Lambda expressions Lambda expressions perform object combination filtering operations, including the content of Lambda expressions. I hope it will be helpful to friends who are interested in .NET tutorials.

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