Compare one value to whole array

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how to compare single value to whole array
int IDuser=100;
int [] IDUserkey={94,96,98,100};
my condition is if IDuSer not present in IDUserkey (suppose IDUser is 150) ,i want write some code..if IDuser present ok..
please help...

Posted 19-Dec-13 19:00pm

Amol Jadhao

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3 solutions

Solution 2

Cheeck

bool result = IDUserkey.Contains( IDuser);

Posted 19-Dec-13 19:08pm

JoCodes

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Karthik_Mahalingam 20-Dec-13 1:24am

right.

Solution 3

If you know that the array is sorted, you can use:

bool exists = Array.BinarySearch(array_1, variable_1) >= 0;
That will be O(log n) rather than O(n) (which all the others are), but it does require the array to be sorted first.

Personally I normally go with the very first form - assuming you are using .NET 3.5 or higher.

If you need to check for several items and the array is large, you may want to create a HashSet <int>

HashSet <int> hashSet = new HashSet <int>(array_1);
bool exists = hashSet.Contains(variable_1)

Posted 19-Dec-13 19:10pm

nuke_infer

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Karthik_Mahalingam · Accepted Answer · 2013-12-19T19:04:00

Solution 1

C#

int IDuser = 100;
           int[] IDUserkey = { 94, 96, 98, 100 };

           if (! IDUserkey.Contains(IDuser))
           {
               // ID User is not present
               // your code here..... 
           }
           else
           {
               // ID User is present
           }

note: add this namespace

C#

using System.Linq;

Posted 19-Dec-13 19:04pm

Karthik_Mahalingam

Updated 19-Dec-13 19:06pm

v2

Comments

Amol Jadhao 20-Dec-13 1:09am

thanks karthik

Karthik_Mahalingam 20-Dec-13 1:24am

welcome amol :)