I need to compare two char list arrays

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Hi, i am trying to check on a webpage for a specific link that whether it is on that page or not. I am trying to convert that tagList to char array and the string url 1st and then i am checking whether it is equal or not(equal in a sense char by char), not by string by string. I want it to check the url i already have hard coded with the all available on any page. As soon as it gets the one i hard coded it should say found. Kindly help if there can be made any changes in this code, or if somewhere i am missing.
Regards.

XML

private void tags_get()
        {

            List<string> tagList = new List<string>();

            List<string> linkList = new List<string>();

            //char[] c_arr;

            string url="http://www.adireo.com/";
            List<char> newUrl = new List<char>(url);
            //Convert.ToChar(newUrl);
            foreach (HtmlElement link in webBrowserCtl.Document.Links)
            {

                linkList.Add(link.GetAttribute("href").ToString());

                tagList.Add(link.InnerText);

            }

            List<string> new_tagList = new List<string>(tagList);
            //Convert.ToChar(new_tagList);
            List<char> url_converted = new List<char>(newUrl);
            for (int a = 0; a < url_converted.Count; a++)
            {
                if (!(new_tagList).Contains(url_converted))
                {
                    MessageBox.Show("found");
                }
                else
                {
                    MessageBox.Show("Not Found");
                }
            }
           }
          }

Posted 23-Aug-12 0:32am

Member 9357064

Updated 23-Aug-12 0:33am

Manas Bhardwaj

v2

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3 solutions

Solution 1

You can use SequenceEqual since you are using c#4.0

Check this.

http://msdn.microsoft.com/en-us/library/bb348567.aspx[^]

or if you want your own method, try this.

C#

static bool ArraysEqual<T>(T[] a1, T[] a2)
{
    if (ReferenceEquals(a1,a2))
        return true;

    if (a1 == null || a2 == null)
        return false;

    if (a1.Length != a2.Length)
        return false;

    EqualityComparer<T> comparer = EqualityComparer<T>.Default;
    for (int i = 0; i < a1.Length; i++)
    {
        if (!comparer.Equals(a1[i], a2[i])) return false;
    }
    return true;
}

Posted 23-Aug-12 0:39am

Santhosh Kumar Jayaraman

Updated 23-Aug-12 0:41am

v2

Comments

Member 9357064 23-Aug-12 6:46am

Thanks for the quick reply. I have a question here that i need to compare the characters in my case. how to do that?

Solution 2

http://stackoverflow.com/questions/996233/c-sharp-how-to-equate-the-elements-of-two-array[^]
http://stackoverflow.com/questions/4347468/net-char-array-comparison[^]

Posted 23-Aug-12 0:54am

ridoy

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Matt T Heffron · Accepted Answer · 2012-08-23T08:03:00

To clarify, it appears you are checking if the text of the link matches url, not if the target of the link matches?
So a link like:
<a href="http://google.com/">http://www.adireo.com/</a>
should be a match?

I don't see the reason that you need to compare char-by-char. StringComparison.Ordinal will do the most-exact comparison.

If you just want a true/false that some link matches url try something like this:

C++

// requires: using System.Linq;
private void tags_get()
{
  const string url="http://www.adireo.com/";
  var links = webBrowserCtl.Document.Links;
  bool found = links.Any(link => string.Equals(link.InnerText, url, System.StringComparison.Ordinal));
  // or, if you really intend to compare the link target:
  //bool found = links.Any(link => string.Equals(link.GetAttribute("href"), url, System.StringComparison.Ordinal));
  MessageBox.Show(found ? "found" : "Not Found");
}

Assuming you want to do something with the links after determining that url is/isn't present, you could get a Dictionary of the links keyed by the text or target:

C++

private void tags_get()
{
  Dictionary<string, HtmlElement> linkMap = new Dictionary<string, HtmlElement>(StringComparer.Ordinal);
  const string url="http://www.adireo.com/";
  foreach (HtmlElement link in webBrowserCtl.Document.Links)
  {
    string key = link.InnerText;  // link text
    // or
    //string key = link.GetAttribute("href"); // link target
    if (linkMap.ContainsKey(key))
    {
      // this link occurs multiple times, handle appropriately!
    }
    linkMap.Add(key, link);
  }

  if (linkMap.ContainsKey(url))
  {
    MessageBox.Show("found");
  }
  else
  {
    MessageBox.Show("Not Found");
  }
  // do additional processing of the links ...
}