how to check if object/string already exists in a list and its exists so how can get that

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list is contains lots of mobile number when i send the msg to number then check the number in exists in list or exists then directly send

Posted 13-Apr-15 19:49pm

Member 11191738

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DontWasteMyTime 14-Apr-15 2:03am

you get it by comparing the number to check to the number on the list.

just simply create a loop that get the max of your LIST like list.rows.count or list.count then create a loop that will continue to loop until it got to list.count. then inside the loop do a IF statement ex: If txtToCheck.text = list.items("index of your loop").value then send

Member 11191738 14-Apr-15 2:14am

please explain

Member 11191738 14-Apr-15 2:29am

i get count from list but how to compare and find

Sergey Alexandrovich Kryukov 14-Apr-15 2:31am

Consider using dictionary or hash map, depending on what else do you want from the collection. The complexity of O(1) is always better...
—SA

Member 11191738 14-Apr-15 2:41am

I DONT Understand
plz explain

4 solutions

Solution 2

or try (if working with List)

XML

List<string> list=new List<string>();
bool isInList=list.Contains("some string");

Posted 13-Apr-15 20:07pm

Florian Braun

v2

Solution 3

List<string> mobiles = new List<string>() {"077777777", "0777777778"};
if (mobiles.Contains("077777779"))
   {
   ...
   }

Posted 13-Apr-15 20:09pm

OriginalGriff

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Abhinav S · Accepted Answer · 2015-04-13T19:58:00

Solution 1

Try

bool alreadyExists = myList.Any(x=> x.mobileNumber==mobileNoToSearch);
if (alreadyExists) {
  //Do sending stuff
}

Posted 13-Apr-15 19:58pm

Abhinav S

Updated 13-Apr-15 19:59pm

v3

Comments

Member 11191738 14-Apr-15 2:16am

i try this but does not return exists number

Abhinav S 14-Apr-15 2:20am

Did you check if the number has spaces or some other characters that are not present in the list?

Member 11191738 14-Apr-15 2:22am

yahh all number are separated by comma

George Swan · Accepted Answer · 2015-04-13T20:54:00

Solution 4

C#

var user = UserList.FirstOrDefault(u => u.MobileNumber==mobileNoToSearch);
if(user!=null)
{
//do something
}

Posted 13-Apr-15 20:54pm

George Swan