?
Solved

C# If Item is not in array

Posted on 2008-06-17
2
Medium Priority
?
2,092 Views
Last Modified: 2013-12-16
Hello,

What I want to be able to do, in C#, is not do something if the item is in an array.

I have a for loop going through a list of items, and it is modifying them. There are some of them that I don't want modified, and I have stored the text of them in a pre-defined array. What I want, is the for loop to go through the array of elements that I want modified, but if the text matches any of the items in another array that I have defined, to not do anything.

Is there any easy way to do this?

Thanks.
0
Comment
Question by:dh-s
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 13

Expert Comment

by:josgood
ID: 21810001
If you make a generic List of don't modify strings as in
   List<string> dontModify= new List<string>();

and then add each text string that shouldn't be modified to the List
      dontModify.Add("nochange1");
      dontModify.Add("nochange2");

then you can
   struct Item {
      public string someText;
   };
   Item myItem = new Item(); // you'll have to initialize it correctly, of course
   if (dontModify.Contains(myItem.someText)) Console.WriteLine("Don't change");

0
 

Accepted Solution

by:
shman911 earned 750 total points
ID: 21810094
iosgood's solution works if you're using a List.  But if you must keep those strings in an array, then you can use the System.Array.Sort() and then System.Array.BinarySearch().  See the example below.  BinarySearch will return an int equal to or greater than zero if the string is found in the array, and will return a negative number if not found.

The only downside is that Sort() will change the ordering of the strings in the array.  If the ordering is important, then you can't sort, and therefore you can't use BinarySearch.
 


string [] strArr = new string[] {"peter", "fred", "bob"};
 
System.Array.Sort(strArr);
System.Array.BinarySearch(strArr, "bob"); //returns int >= 0
System.Array.BinarySearch(strArr, "eric"); //returns int < 0

Open in new window

0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Calculating holidays and working days is a function that is often needed yet it is not one found within the Framework. This article presents one approach to building a working-day calculator for use in .NET.
This article shows how to deploy dynamic backgrounds to computers depending on the aspect ratio of display
In this brief tutorial Pawel from AdRem Software explains how you can quickly find out which services are running on your network, or what are the IP addresses of servers responsible for each service. Software used is freeware NetCrunch Tools (https…
This tutorial will teach you the special effect of super speed similar to the fictional character Wally West aka "The Flash" After Shake : http://www.videocopilot.net/presets/after_shake/ All lightning effects with instructions : http://www.mediaf…
Suggested Courses

777 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question