EN
C# / .NET - get file extension
7 points
In C# / .NET it is possible to get file extension from path in following way.
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string path = @"C:\path\to\file.txt";2
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string extension = Path.GetExtension(path);4
Console.WriteLine("File extension: " + extension);Output:
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File extension: .txtxxxxxxxxxx1
public class PathUtils2
{3
private static char[] DELIMITERS = new char[] { '\\', '/' };4
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public static string GetFilename(string path)6
{7
int index = path.LastIndexOfAny(DELIMITERS);8
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if (index == -1)10
return path;11
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return path.Substring(index + 1);13
}14
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public static string GetExtension(string path)16
{17
string name = GetFilename(path);18
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int index = name.LastIndexOf(".");20
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if (index == -1)22
return "";23
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if (index == name.Length - 1)25
return "";26
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return name.Substring(index);28
}29
}Example:
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string path = @"C:\path\to\file.txt";2
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string extension = PathUtils.GetExtension(path);4
Console.WriteLine("File extension: " + extension);Output:
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File extension: .txtxxxxxxxxxx1
public class PathUtils2
{3
private static Regex REGEX = new Regex(@"(\.[^.\/]+)$");4
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public static string GetExtension(string path)6
{7
Match match = REGEX.Match(path);8
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foreach(Group entry in match.Groups)10
return entry.Value;11
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return "";13
}14
}Example:
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string path = @"C:\path\to\file.txt";2
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string extension = PathUtils.GetExtension(path);4
Console.WriteLine("File extension: " + extension);Output:
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File extension: .txt