Contains in lambda expression [Resolved]

Posted by Venkatesh under LINQ on 3/24/2016 | Points: 10 | Views : 4760 | Status : [Member] | Replies : 2

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Hi,

I have variable like string str="ABCD";
I have list object which contains some columns like ID,Username. In this object username getting with separated comma.
I want get the list of ID's of "ABCD" username?

How can i get this with lambda expression?

Thanks,
Venkatesh.P

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Posted by: Rajnilari2015 on: 3/24/2016 [Member] [Microsoft_MVP] [MVP] Platinum | Points: 50

0	@Venkatesh, Try this using System; using System.Collections.Generic; using System.Linq; namespace ConsoleApplication3 { class Program { static void Main(string[] args) { List<Test> objTest = new List<Test>(); objTest.Add(new Test { ID = 1, UserName = "ABCD,EF,A,B,C" }); objTest.Add(new Test { ID = 2, UserName = "KK,LL,QA,AQB,RC" }); objTest.Add(new Test { ID = 3, UserName = "UTI" }); objTest.Add(new Test { ID = 4, UserName = "EOF,UB,ABCD,C" }); string str = "ABCD"; string[] stringSeparator = new string[] { "," }; objTest .ForEach(i => { if (i.UserName .Split(stringSeparator, StringSplitOptions.None) .Any(j => j.StartsWith(str))) { Console.WriteLine("The search string {0} is present in {1} where the ID is {2}", str, i.UserName, i.ID); } }); Console.ReadKey(); } } public class Test { public int ID { get; set; } public string UserName { get; set; } } } Result The search string ABCD is present in ABCD,EF,A,B,C where the ID is 1 The search string ABCD is present in EOF,UB,ABCD,C where the ID is 4 Hope this helps -- Thanks & Regards, RNA Team Venkatesh, if this helps please login to Mark As Answer. \| Alert Moderator

@Venkatesh,
Try this

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

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            List<Test> objTest = new List<Test>();
            objTest.Add(new Test { ID = 1, UserName = "ABCD,EF,A,B,C" });
            objTest.Add(new Test { ID = 2, UserName = "KK,LL,QA,AQB,RC" });
            objTest.Add(new Test { ID = 3, UserName = "UTI" });
            objTest.Add(new Test { ID = 4, UserName = "EOF,UB,ABCD,C" });           

            string str = "ABCD";
            string[] stringSeparator = new string[] { "," };

            objTest
                .ForEach(i =>
                {
                    if (i.UserName
                    .Split(stringSeparator, StringSplitOptions.None)
                    .Any(j => j.StartsWith(str)))
                    {
                        Console.WriteLine("The search string {0} is present in {1} where the ID is {2}", str, i.UserName, i.ID);
                    }
              });
            Console.ReadKey();
        }
    }

    public class Test
    {
        public int ID { get; set; }
        public string UserName { get; set; }
    }
}

Result

The search string ABCD is present in ABCD,EF,A,B,C where the ID is 1
The search string ABCD is present in EOF,UB,ABCD,C where the ID is 4

Hope this helps

--
Thanks & Regards,
RNA Team

Venkatesh, if this helps please login to Mark As Answer. | Alert Moderator

Posted by: Sheonarayan on: 3/24/2016 [Administrator] HonoraryPlatinum | Points: 25

0	You can use .Contains method of LINQ. var result = list.Where(d => d.UserName.Contains("ABCD")); and you should get desired result. Like contains you have StartsWith, EndsWith methods also, you can use them as well to these scenarios. To know more about LINQ methods, I would highly recommend you to read this post of mine http://www.dotnetfunda.com/articles/show/993/frequently-used-linq-extension-methods. Thanks and hope this helps. Regards, Sheo Narayan http://www.dotnetfunda.com Venkatesh, if this helps please login to Mark As Answer. \| Alert Moderator

You can use .Contains method of LINQ.

var result = list.Where(d => d.UserName.Contains("ABCD"));

and you should get desired result.

Like contains you have StartsWith, EndsWith methods also, you can use them as well to these scenarios. To know more about LINQ methods, I would highly recommend you to read this post of mine http://www.dotnetfunda.com/articles/show/993/frequently-used-linq-extension-methods.

Thanks and hope this helps.

Regards,
Sheo Narayan
http://www.dotnetfunda.com

Venkatesh, if this helps please login to Mark As Answer. | Alert Moderator

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