compare avalue with an array values

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hiii all

i have an array like that:

<br />
int[] Departments = new int[4] { 2, 3, 4, 5 };<br />

and i have another value entered by the user. i want to check if this value is in the array values or not.

i tried :

MIDL

if(x "Not IN" Departments)
      {
      }

but there is an error in it.
can any body help me in that, please???

Thanks

Posted 3-Jul-11 0:20am

moon2011

Updated 3-Jul-11 0:21am

v2

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OriginalGriff · Answer 1 · 2011-07-03T00:26:00

Solution 1

Try:

int[] Departments = new int[4] { 2, 3, 4, 5 };
if (Departments.Contains(3))
    {
    MessageBox.Show("Yes!");
    }

Posted 3-Jul-11 0:26am

OriginalGriff

Comments

Sergey Alexandrovich Kryukov 3-Jul-11 13:12pm

My 5, but I added recommendations about collections to improve performance on big data sets, please see.
--SA

RaviRanjanKr · Answer 2 · 2011-07-03T11:10:00

Solution 4

In addition to above solution you can also try BinarySearch for checking value is present or not in given set of array.
take a look

C#

int[] Departments = new int[4] { 2, 3, 4, 5 };
 if (Array.BinarySearch(Departments, 3) >= 0)
     {
     //Yes Present
     }

Posted 3-Jul-11 11:10am

RaviRanjanKr

Updated 3-Jul-11 11:11am

v2

Comments

OriginalGriff 4-Jul-11 3:39am

Just a suggestion - don't refer to "the above solution". When they get re-ordered due to votes, it can look like you are referring to a completely different answer. Try saying "[name of user]'s solution" instead.

RaviRanjanKr 4-Jul-11 5:38am

Got it. Thanks OriginalGriff :)

OriginalGriff 4-Jul-11 5:48am

You're welcome!

#realJSOP · Answer 3 · 2011-07-03T01:57:00

Solution 2

Of course, if you want to check for "not in", and using Griff's example above, it would be:

C#

if (!Departments.Contains(3))
{
   MessageBox.Show("The value 3 is not in Departments".")
}

Posted 3-Jul-11 1:57am

#realJSOP

Sergey Alexandrovich Kryukov · Answer 4 · 2011-07-03T07:10:00

If you really need performance you should use some (temporary) container with faster access. With the array, you have performance of O(n) (see http://en.wikipedia.org/wiki/Big_O_notation[^]).

Consider System.Collections.Generic.SortedList, System.Collections.Generic.SortedDictionary and System.Collections.Generic.Dictionary. They have different access times O(log(n)) to the best O(1) in Dictionary, different insertion times and memory overheads.

Please see for more detail:
http://msdn.microsoft.com/en-us/library/system.collections.sortedlist(v=VS.100).aspx[^],
http://msdn.microsoft.com/en-us/library/f7fta44c(v=VS.100).aspx[^],
http://msdn.microsoft.com/en-us/library/xfhwa508.aspx[^].

—SA

Member 8043849 · Answer 5 · 2011-07-03T15:18:00

Solution 5

if (!Departments.Contains(x))
{

}

Posted 3-Jul-11 15:18pm

Member 8043849

Aneesh M · Answer 6 · 2011-07-04T01:44:00

Solution 6

hi,

you can also use looping
for(int i=0;i<departments.length,i++)>
{
if(Departments[i]==5)
{
messageBox.Show("Element Exists");
}
}

Posted 4-Jul-11 1:44am

Aneesh M