Generate Filename

Question

Hi, How to construct filename for the this(abc_{yyMMdd}_xyz_{HHmm}.txt) format, The function should return filename like this abc_140822_xyz_1446.txt. Please post solution for this post. Thanks in Advance

Vulpes · Answer

Try this: using System; using System.Text.RegularExpressions; class Test { static void Main() { string[] fileTemplates = { "abc_{yyMMdd}_xyz_{HHmm}.txt", "abc_{yyMMdd}_xyz_{HHmm}", "abc_{yyMMdd_HHmm}" }; foreach(string fileTemplate in fileTemplates) { string f = GetFileNameFromTemplate(fileTemplate); Console.WriteLine(f); } Console.ReadKey(); } static string GetFileNameFromTemplate(string fileTemplate) { DateTime now = DateTime.Now; string r = @"\{(.*?)}"; string f = Regex.Replace(fileTemplate, r, m => now.ToString(m.Groups[1].Value)); if (!f.EndsWith(".txt")) f += ".txt"; return f; } } When I tried it just now (UK time) the output was: abc_140822_xyz_1556.txt abc_140822_xyz_1556.txt abc_140822_1556.txt

Kalai · Answer

Pls check this. http://www.codeproject.com/Questions/322056/search-files-in-directory-Csharp

Rajkumar R · Answer

Hi I will pass this " abc_{yyMMdd}_xyz_{HHmm}" as an input parameter to the function. The function should return appropriate filename. Sometime the input parameter may be like this " abc_{yyMMdd_HHmm}." So the function should handle all the cases, Thanks in Advance.

Kalai · Answer

Try this method. public string GenerateFileName() { string yy = DateTime.Now.Year.ToString(); yy = yy.Substring(yy.Length - 2); string mm = DateTime.Now.Month.ToString().Length == 1 ? "0" + DateTime.Now.Month.ToString() : DateTime.Now.Month.ToString(); string dd = DateTime.Now.Day.ToString().Length == 1 ? "0" + DateTime.Now.Day.ToString() : DateTime.Now.Day.ToString(); string filename = "abc_" + yy + mm + dd + "_xyz_" + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + ".txt"; return filename; }

Generate Filename

Answers (4)