contains method

Question

hi to all can any one please explain how to use contain method for class objects if i want to check wheather the employee name is there in employee object then how to write contains method

Kirtan Patel · Answer

Friend, your Desired Code is Below please check "Do you like this answer" checkbox if it helps you :) Thank you :) static void Main( string [] args) { LinkedList LibraryClass > obj = new LinkedList LibraryClass >(); obj.AddFirst( new LibraryClass (10, "srinivas" , "fds" , "dsffdsf" )); obj.AddFirst( new LibraryClass (20, "srini" , "ffds" , "ddsfsffdsf" )); obj.AddFirst( new LibraryClass (30, "sriniffsf" , "ffdfsfds" , "dfdsdsfsffdsf" )); Boolean flag = false ; foreach ( LibraryClass l in obj) { if (l.BookName == "srinivas1" ) { Console .WriteLine( "List Contain Book Name Srinivas" ); flag = true ; break ; } } if (flag == false ) { Console .WriteLine( "Book Name Not Found" ); } Console .ReadKey(); }

Hiren Soni · Answer

Write somewhat your code. So it becomes very helpful 2 solve ur problem

srinivas · Answer

thank you for your answer is there any possibility to give the field to check wheather the list contains the object of that field in the contains function itself

Nilanka Dharmadasa · Answer

Hi Srinivas, I found the solution for you. You should write your employee class as follows. Focus on the lines in red. public class Employee : IEquatable { public string name; public int age; public override bool Equals(object obj) { return this.Equals(obj as Employee); } public bool Equals(Employee p) { // If parameter is null, return false. if (Object.ReferenceEquals(p, null)) { return false; } // Optimization for a common success case. if (Object.ReferenceEquals(this, p)) { return true; } // If run-time types are not exactly the same, return false. if (this.GetType() != p.GetType()) return false; return (name == p.name);//Here, if names are equals return true. } } That means, I wrote a value equality for the employee. If the names are same of two employee objects it will return true for Equals method. Now you can use Contains method. Employee a = new Employee(); a.name = "abc"; a.age = 18; Employee b = new Employee(); b.name = "sdf"; b.age = 18; List v = new List (); v.Add(a); if (v.Contains(b)) //If b has the same name as a it will return true. Otherwise false. { } If you have any problem let me know pls. If you find this answer useful, please tick ' Do you like this answer ' checkbox.

srinivas · Answer

how to implement /use that extension method in my program. is there any possible to use that method please help me

srinivas · Answer

srinivas · Answer

ok thank you I got it do you know about the extension method of contains

Hiren Soni · Answer

Hiren Soni · Answer

srinivas · Answer

using System; using System.Collections.ObjectModel; using System.Collections.Generic; using System.Linq; using System.Text; //this is my class public class LibraryClass { #region Fields int bookId; string bookName; string category; string authorName; #endregion #region Properties public int BookId { get { return bookId; } set { bookId = value; } } public string BookName { get { return bookName; } set { bookName = value; } } public string Category { get { return category; } set { category = value; } } public string AuthorName { get { return authorName; } set { authorName = value; } } #endregion public LibraryClass() { } public LibraryClass(int a,string b,string c,string d) { this.BookId = a; this.BookName = b; this.category = c; this.AuthorName = d; } public override string ToString() { return string.Format("{0,-5}{1,-10}{2,-10}{3,-10}", BookId, BookName, Category, AuthorName); } } class Program { static void Main(string[] args) { LinkedList obj = new LinkedList (); obj.AddFirst(new LibraryClass(10,"srinivas","fds","dsffdsf")); obj.AddFirst(new LibraryClass(20, "srini", "ffds", "ddsfsffdsf")); obj.AddFirst(new LibraryClass(30, "sriniffsf", "ffdfsfds", "dfdsdsfsffdsf")); foreach (LibraryClass val in obj) { Console.WriteLine(val); } now i have to know wheather obj linkedlist has an Library class object with BookName="srinivas" to know this how to write the Contains method } }

srinivas · Answer

i have to use contains method for LinkedList that is iam storing my employe objects in ths linkedlist and now using Contains method how to know my linkedlist has an object which has the name="xyz" i think you understood my problem plz help me for this thank you

Hiren Soni · Answer