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Changing System.Path.GetFileName(string path)

Posted on 2010-11-26
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Last Modified: 2013-12-17
In my winform app I use the System.Path.GetFileName(string path).
I would like that if the string is a web address  (like : "http://www.123.com/1.htm") it will return the string without any change.
How can I do this ?
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Question by:yaron89
6 Comments
 
LVL 5

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by:buraksarica
buraksarica earned 125 total points
ID: 34215944
You can check against this situation like :

result = mypath;
if (false==mypath.StartsWith("http://"))
{
     result = System.Path.GetFileName(mypath);
}

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by:Alpesh Patel
Alpesh Patel earned 125 total points
ID: 34216420
Hi,

You can get page name from Server Variables of Request object.
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yaron89 earned 0 total points
ID: 34216422
Thanks. My ask is about changing the System.Path.GetFileName(string path) so I won't have to check against  any situation in the code.
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LVL 13

Assisted Solution

by:Naman Goel
Naman Goel earned 125 total points
ID: 34216897
No, Path.GetFileName() is not doing anything special other than simple string extraction

Please look at below attached code for complete internal implementation of Path.GetFileName(path) method

you can instead use any other method for your purpose as suggested by buraksarica,PatelAlpesh or you can create your own URL validation method
 like below and use this method to check for URL and return the same URL for this method returns true otherwise extract filename by Path.GetFileName() method.


/// <summary>
/// method for validating a url with regular expressions
/// </summary>
/// <param name="url">url we're validating</param>
/// <returns>true if valid, otherwise false</returns>
public static bool isValidUrl(ref string url)
{
    string pattern = @"^(http|https|ftp)\://[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(:[a-zA-Z0-9]*)?/?([a-zA-Z0-9\-\._\?\,\'/\\\+&amp;%\$#\=~])*[^\.\,\)\(\s]$";
    Regex reg = new Regex(pattern, RegexOptions.Compiled | RegexOptions.IgnoreCase);
    return reg.IsMatch(url);
}
public static string GetFileName(string path)
{
    if (path != null)
    {
        CheckInvalidPathChars(path);
        int length = path.Length;
        int num2 = length;
        while (--num2 >= 0)
        {
            char ch = path[num2];
            if (((ch == DirectorySeparatorChar) || (ch == AltDirectorySeparatorChar)) || (ch == VolumeSeparatorChar))
            {
                return path.Substring(num2 + 1, (length - num2) - 1);
            }
        }
    }
    return path;
}

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Assisted Solution

by:BuggyCoder
BuggyCoder earned 125 total points
ID: 34216902
if you write Path.GetFileName(@"http:\\www.123k.com\123.htm"); it will return 123.htm however if you append '\' at the end it will return nothing. so you can check if nothing is returned you can take the passed variable as output in the following way:-

string path = @"http:\\www.kochar.com\123.htm";
string result = (Path.GetFileName(path + @"\").Length == 0 ? path : Path.GetFileName(path));

Console.WriteLine("Path is: " + result);
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Author Closing Comment

by:yaron89
ID: 34399048
.
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