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Categories / C# Tutorial / String

 

Use LastIndexOf(Char) to find the last directory separator character in a string and to extract the file name

using System; using System.IO; public class MainClass {    public static void Main()    {       string filename;       filename = ExtractFilename(@"C:\temp\notafile.txt");       Console.WriteLine("{0}", String.IsNullOrEmpty(filename) ? "<none>" : filename);    }    public static string ExtractFilename(string filepath)    {       if (filepath.Trim().EndsWith(@"\"))          return String.Empty;       int position = filepath.LastIndexOf('\\');       if (position == -1)       {          if (File.Exists(Environment.CurrentDirectory + Path.DirectorySeparatorChar + filepath))              return filepath;          else             return String.Empty;       }       else       {          if (File.Exists(filepath))             return filepath.Substring(position + 1);          else             return String.Empty;       }    } }