Text Box with filename

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2.67/5 (3 votes)

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I have a folder in my computer and inside folder i have many txt files who created by another programm.
i want to make a textbox that capture the filename of the last txt file that create the programm.
i know that it is dificult for me to do that

Posted 20-Dec-15 5:10am

Stm21

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BillWoodruff 20-Dec-15 11:57am

So, get started by reading the code examples for reading a Directory which are available, as Richard shows you, on MSDN, here, and on StackOverFlow.

Are you going to need to search Directories within the target Directory ?

Stm21 20-Dec-15 12:07pm

this folder create a folder per day

BillWoodruff 20-Dec-15 12:21pm

May I point out that you are not "new" on CodeProject; you've been coming here since March 15, this year. I wonder what's going on that you are still unable to write a clear question, or respond to direct questions: is it a problem with English, or, are you just not studying C# very much ?

A key piece of information here is whether you are only going to get the length of Files in your target Directory, or are you going to need to recursively search each Directory in the target Directory.

When, and if, you post some code showing you are making an effort here, I and other folks will be happy to assist you.

4 solutions

Solution 4

Well, I was holding back on posting an example using Linq, but now that my esteemed colleague, Richard MacCutchan, has posted one (it is very probable I esteem him much more than he esteems me):

C#

// assume a WinForm with FolderBrowserDialog added at design-time
using System.IO;
using System.Linq;

private void SomeButton_Click(object sender, EventArgs e)
{
    FileInfo longestFile = null;

    string filter = @"*.*"; // all directories, all files

    SearchOption searchType = SearchOption.AllDirectories;

    if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
    {
        longestFile = new DirectoryInfo(folderBrowserDialog1.SelectedPath)
            .EnumerateFiles(filter, searchType)
            .OrderByDescending(fil => fil.Length)
            .FirstOrDefault();
    }

    Console.WriteLine("Longest File: {0} Length: {1}", longestFile.FullName, longestFile.Length);
}

Note: the 'SearchOption.AllDirectories flag is what makes the search recursive. Do read the MSDN docs for the interesting aspects/behaviors of 'EnumerateFiles compared to using 'GetFiles: [^]: "Therefore, when you are working with many files and directories, EnumerateFiles can be more efficient."

Posted 20-Dec-15 7:35am

BillWoodruff

Comments

Richard MacCutchan 21-Dec-15 3:41am

Come, come Bill; I esteem anyone who makes the effort to answer questions on these forums.

Solution 5

i think i found it

C#

var file = Directory.GetFiles("folder", "*.*").OrderByDescending(d => new FileInfo(d).CreationTime).Select(Path.GetFileNameWithoutExtension);
            var selector = from i in file
                           orderby new FileInfo(i).CreationTime descending
                           select i;
            var last = selector.FirstOrDefault();
            textBox2.Text = last;

Posted 24-Dec-15 5:16am

Stm21

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard MacCutchan · Accepted Answer · 2015-12-20T06:32:00

Solution 2

Solution posted by webmaster442:

Based on the documentation and with some use of linq :)

C#

var files = Directory.GetFiles("your_folder_here", "*.txt");
var selector = from i in files
               orderby new FileInfo(i).CreationTime descending
               select i;
var last = selector.FirstOrDefault();
TextBox.Text = last;

Posted 20-Dec-15 6:32am

Richard MacCutchan

Updated 21-Dec-15 4:12am

v2

Comments

Stm21 20-Dec-15 13:08pm

The name 'files' does not exist in the current context
i place the using System.IO;

Richard MacCutchan 21-Dec-15 3:36am

Sorry I can't help you with that, I am not the person who wrote the above code.

webmaster442 21-Dec-15 10:12am

Corrected the code with the missing line

BillWoodruff 20-Dec-15 14:28pm

Just curious why webmaster422 is not posting this.

Richard MacCutchan 21-Dec-15 3:34am

He edited my question and added it there. I moved it as I am not a linq expert.

Stm21 24-Dec-15 9:41am

Thank you for the code
One more question
In the text box i get folder\file.txt
i want only the filename

Richard MacCutchan 24-Dec-15 11:11am

Use one of the String methods to split the filename out.

Richard MacCutchan · Accepted Answer · 2015-12-20T05:26:00

Solution 1

Not that difficult, just list the files in the directory[^], and sort them into date order.

Removed webmaster442's addition since I do not know linq. Posted as a separate solution.

Posted 20-Dec-15 5:26am

Richard MacCutchan

Updated 20-Dec-15 6:31am

v3

Comments

Sergey Alexandrovich Kryukov 20-Dec-15 11:29am

5ed.
—SA

Stm21 20-Dec-15 11:41am

easy for u not for me

Richard MacCutchan 20-Dec-15 11:44am

I said, "not that difficult", which means I expect you to read the documentation, and try a few things for yourself. Please don't expect other people to write your code for you.

BillWoodruff 20-Dec-15 11:53am

Vote changed from +5 to +3: I voted 5 for the Linq (first) answer. With only one link, and no real commentary: imho, this is a #3 post.

Text Box with filename

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Text Box with filename

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