[RESOLVED] Skip certain elements in an array?
CodeGuru Home VC++ / MFC / C++ .NET / C# Visual Basic VB Forums Developer.com
Results 1 to 5 of 5

Thread: [RESOLVED] Skip certain elements in an array?

Hybrid View

  1. #1
    Join Date
    Jan 2010
    Posts
    130

    [RESOLVED] Skip certain elements in an array?

    Elements cannot be removed from an array. Is it possible to skip or hide particular items in an array by stating the element ID of the elements desired to be skipped? As far as I understand the method Skip() only skips the first element or elements, depending on how many you specified. Here is an example below of why I need to skip certain elements in the array:

    Code:
    public void MergeVolumes()
            {
                Volumes[] lVolumes = mWebService.getAllVolumes();
                List<string> contents = new List<string>();
                int count = lVolumes.Length; // Original value of count
                int volumeOrder = 1; // First category of unknown number of categories
                int ID = 0; // Element ID
    
                // Add the content of all volumes of a book to a list<string> "contents" in chronological order
                for (int i = 0; i < count; i++)
                {
                    int volumeNo = lVolumes[ID].Number;
    
                    if (volumeNo == volumeOrder)
                    {
                        // Add content of the current volume to the list
                        contents.Add(lVolumes[ID].Content);
    
                        // Skip this element each time
                        lVolumes.Skip(ID); // PROBLEM!
    
                        // Look for next volume now
                        volumeOrder++;
                    }
                    else
                    {
                        // Keep looping till find the desired volume
                        count++;
                    }
    
                    // Once run through array once, rerun
                    if (ID == lVolumes.Length - 1)
                    {
                        // Reset to zero
                        ID = 0;
                    }
                    ID++;
                }
            }
    I have considered using some form of two-dimensional arraylist,containing both the volume no and the volume content, enabling me to remove specified elements from the arraylist but I don't know what I can use....

  2. #2
    Join Date
    Mar 2003
    Location
    India {Mumbai};
    Posts
    3,871

    Re: Skip certain elements in an array?

    Two fast approaches:

    1. Use List instead of Array.
    2. Have another temporary Array - copy all needed (those should be kept) elements into this temporary Array. Then erase all items from original array, and copy the temporary array into main array.
    My latest article: Explicating the new C++ standard (C++0x)

    Do rate the posts you find useful.

  3. #3
    Join Date
    Jun 2001
    Location
    Melbourne/Aus (C# .Net 4.0)
    Posts
    686

    Re: Skip certain elements in an array?

    Another option maybe to use LINQ to select just the items in the collection that you wish to process. Then iterate over the collection returned by the LINQ query, rather than the original collection. Note though that they are still in effect the 'same' collection. So you will find that similar restrictions apply when it comes to updating/deleting items from the LINQ collection.
    Also, if possible, do what Ajay says in '1...'
    Rob
    -
    Ohhhhh.... Old McDonald was dyslexic, E O I O EEEEEEEEEE.......

  4. #4
    Join Date
    Aug 2008
    Posts
    902

    Re: Skip certain elements in an array?

    You defiantly want to be using List<> instead of an array... almost always.

    You can use members like List.ForEach and List.FindAll, which is easy using lambdas.

  5. #5
    Join Date
    Jan 2010
    Posts
    130

    Re: Skip certain elements in an array?

    THanks!

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  


Azure Activities Information Page

Windows Mobile Development Center


Click Here to Expand Forum to Full Width

This is a CodeGuru survey question.


Featured


HTML5 Development Center