Develop Reference

How to rename a list of files to a specific name format?

I have a list of files
1_test.pdf, 2_test.pdf, 3_test.pdf, 4_test.pdf, 5_test.pdf, 6_test.pdf, 7_test.pdf, 8_test.pdf, 9_test.pdf, 10_test.pdf.
I need to rename them to a format
test_f0001.pdf, test_f0002.pdf, test_f0003.pdf, test_f0004.pdf, test_f0005.pdf, test_f0006.pdf, test_f0007.pdf, test_f0008.pdf, test_f0009.pdf, test_f0010.pdf.
Is it possible to rename them without copying or moving the files?
Thank you!

There is no such thing as 'renaming' when it comes to files, you have to use move.
So, simply,
var file = #"A.txt";
File.Move(file, "A1.txt");
would rename your A.txt to A1.txt.
EDIT
For renaming the files, you can manipulate strings. Assuming your original files adhere to your example:
var file = "10_test.pdf";
int.TryParse(file.Split('_').ToList().ElementAt(0), out int num);
var rename = string.Format("test_f{0:0000}.pdf", num);
So this will change
10_test.pdf ==> test_f0010.pdf
and
1_test.pdf ==> test_f0001.pdf
The {0:0000} in the string.Format() tells it to print a number, filling it with leading zeros upto 4 digits.

You can use System.IO.File.Move to rename a file, by moving it to the same directory with a new name (when renaming a file, you're technically changing the full path of the file).
For example:
private static void CustomRename(string directoryPath)
{
foreach (var file in Directory.GetFiles(directoryPath))
{
var basePath = Path.GetDirectoryName(file);
var ext = Path.GetExtension(file);
// If it doesn't have our extension, continue
if (!ext.Equals(".pdf", StringComparison.OrdinalIgnoreCase)) continue;
var nameParts = Path.GetFileNameWithoutExtension(file).Split('_');
// If it doesn't have our required parts, continue
if (nameParts.Length != 2) continue;
var numericPart = nameParts[0];
int number;
// If the numeric part isn't numeric, continue
if (!int.TryParse(numericPart, out number)) continue;
// Create new file name and rename file by moving it
var newName = $"{nameParts[1]}_f{number:0000}{ext}";
File.Move(file, Path.Combine(basePath, newName));
}
}

Nope. You need to move it:
System.IO.File.Move(oldNameFullPath, newNameFullPath);

How to create a folder out of the first few letters of a filename?

So I checked out the basic things but I'd like to do the following:
I have 5 files let's say: X1_word_date.pdf, XX1_word_date.pdf, etc...
I'd like to create a folder structure like: C:\PATH\X1, C:\PATH\XX1, etc...
So how do I take the first letters before the '_' in the file names and put it into a string?
My idea is that I use the Directory.CreateDirectory and than combine the main path and the strings so I get the folders.
How do I do that? Help appreciated.

string fileName = "X1_word_date.pdf";
string[] tokens = fileName.Split('_');
string myPath = "C:\\PATH\\";
Directory.CreateDirectory( myPath + tokens[0]);
Something like this should work. Using Split() will also allow for numbers greater than 9 to be dealt with

Supposed that your files is a List<string> which contains the file name (X2_word_date.pdf,...)
files.ForEach(f => {
var pathName= f.Split('_').FirstOrDefault();
if(!string.IsNullOrEmpty(pathName))
{
var directoryInfo = DirectoryInfo(Path.Combine(#"C:\PATH", pathName));
if(!directoryInfo.Exists)
directoryInfo.Create();
//Then move this current file to the directory created, by FileInfo and Move method
}
})

With simple string methods like Split and the System.IO.Path class:
var filesAndFolders = files
.Select(fn => new
{
File = fn,
Dir = Path.Combine(#"C:\PATH", Path.GetFileNameWithoutExtension(fn).Split('_')[0].Trim())
});
If you want to create that folder and add the file:
foreach (var x in filesAndFolders)
{
Directory.CreateDirectory(x.Dir); // will only create it if it doesn't exist yet
string newFileName = Path.Combine(x.Dir, x.File);
// we don't know the old path of the file so i can't show how to move
}

Or using regex
string mainPath = #"C:\PATH";
string[] filenames = new string[] { "X1_word_date.pdf", "X2_word_date.pdf" };
foreach (string filename in filenames)
{
Match foldernameMatch = Regex.Match(filename, "^[^_]+");
if (foldernameMatch.Success)
Directory.CreateDirectory(Path.Combine(mainPath, foldernameMatch.Value));
}

Using the bigger picture starting with only your Source and Destination directory.
We can list all files we need to move with Directory.GetFiles.
In this list We first isolate the filename with GetFileName.
Using simple String.Split you have the new directory name.
Directory.CreateDirectory will create directories unless they already exist.
To move the file we need its destination path, a combinaison of the Destination directory path and the fileName.
string sourceDirectory = #"";
string destDirectory = #"";
string[] filesToMove = Directory.GetFiles(sourceDirectory);
foreach (var filePath in filesToMove) {
var fileName = Path.GetFileName(filePath);
var dirPath = Path.Combine(destDirectory, fileName.Split('_')[0]);
var fileNewPath= Path.Combine(dirPath,fileName);
Directory.CreateDirectory(dirPath);// If it exist it does nothing.
File.Move(filePath, fileNewPath);
}

Trying to delete multiple files from a single directory whose names match\contain a particular string

I wish to delete image files. The files are named somefile.jpg and somefile_t.jpg, the file with the _t on the end is the thumbnail. With this delete operation I wish to delete both the thumbnail and original image.
The code works up until the foreach loop, where the GetFiles method returns nothing.
The string.Substring operation successfully returns just the file name with no extension and no _t e.g: somefile.
There are no invalid characters in the file names I wish to delete.
Code looks good to me, only thing I can think of is that I am somehow not using the searchpattern
function properly.
filesource = "~/somedir/somefile_t.jpg"
var dir = Server.MapPath(filesource);
FileInfo FileToDelete = new FileInfo(dir);
if (FileToDelete.Exists)
{
var FileName = Path.GetFileNameWithoutExtension(FileToDelete.Name);
foreach(FileInfo file in FileToDelete.Directory.GetFiles(FileName.Substring(0, FileName.Length - 2), SearchOption.TopDirectoryOnly).ToList())
{
file.Delete();
}
}

DirectoryInfo.GetFiles Method (String, SearchOption)
You need to ensure that the first parameter, searchPattern, is proper. In you're case you are supplying FileName.Substring(0, FileName.Length - 2), which would be "somefile". The reason the method returns nothing is because you are looking for files literally named somefile. What you meant to do was to use a wildcard in addition to the base filename: String.Concat(FileName.Substring(0, FileName.Length - 2), "*"), which would be "somefile*" ... at least I think you're looking for that searchPattern as opposed to any other one.

This code works for me:
var file_path = #"K:\Work\IoCToy\IoCToy\image.jpg";
var dir = Path.GetDirectoryName(file_path);
var fileNameWithoutExtension = Path.GetFileNameWithoutExtension(file_path);
var files = Directory.EnumerateFiles(dir, string.Format("{0}*", fileNameWithoutExtension), SearchOption.TopDirectoryOnly);
Of course, you have to delete the files by the returned file names. I am assuming here that your folder contains only the image and the thumbnail file which start with the "image" substring.

Get folder name from full file path

How do I get the folder name from the full path of the application?
This is the file path below,
c:\projects\root\wsdlproj\devlop\beta2\text
Here "text" is the folder name.
How can I get that folder name from this path?

See DirectoryInfo.Name:
string dirName = new DirectoryInfo(#"c:\projects\roott\wsdlproj\devlop\beta2\text").Name;

I think you want to get parent folder name from file path. It is easy to get.
One way is to create a FileInfo type object and use its Directory property.
Example:
FileInfo fInfo = new FileInfo("c:\projects\roott\wsdlproj\devlop\beta2\text\abc.txt");
String dirName = fInfo.Directory.Name;

Try this
var myFolderName = #"c:\projects\roott\wsdlproj\devlop\beta2\text";
var result = Path.GetFileName(myFolderName);

You could use this:
string path = #"c:\projects\roott\wsdlproj\devlop\beta2\text";
string lastDirectory = path.Split(new char[] { System.IO.Path.DirectorySeparatorChar }, StringSplitOptions.RemoveEmptyEntries).Last();

Simply use Path.GetFileName
Here - Extract folder name from the full path of a folder:
string folderName = Path.GetFileName(#"c:\projects\root\wsdlproj\devlop\beta2\text");//Return "text"
Here is some extra - Extract folder name from the full path of a file:
string folderName = Path.GetFileName(Path.GetDirectoryName(#"c:\projects\root\wsdlproj\devlop\beta2\text\GTA.exe"));//Return "text"

I figured there's no way except going into the file system to find out if text.txt is a directory or just a file. If you wanted something simple, maybe you can just use:
s.Substring(s.LastIndexOf(#"\"));

In this case the file which you want to get is stored in the strpath variable:
string strPath = Server.MapPath(Request.ApplicationPath) + "/contents/member/" + strFileName;

Here is an alternative method that worked for me without having to create a DirectoryInfo object. The key point is that GetFileName() works when there is no trailing slash in the path.
var name = Path.GetFileName(path.TrimEnd(Path.DirectorySeparatorChar));
Example:
var list = Directory.EnumerateDirectories(path, "*")
.Select(p => new
{
id = "id_" + p.GetHashCode().ToString("x"),
text = Path.GetFileName(p.TrimEnd(Path.DirectorySeparatorChar)),
icon = "fa fa-folder",
children = true
})
.Distinct()
.OrderBy(p => p.text);

This can also be done like so;
var directoryName = System.IO.Path.GetFileName(#"c:\projects\roott\wsdlproj\devlop\beta2\text");

Based on previous answers (but fixed)
using static System.IO.Path;
var dir = GetFileName(path?.TrimEnd(DirectorySeparatorChar, AltDirectorySeparatorChar));
Explanation of GetFileName from .NET source:
Returns the name and extension parts of the given path. The resulting
string contains the characters of path that follow the last
backslash ("\"), slash ("/"), or colon (":") character in
path. The resulting string is the entire path if path
contains no backslash after removing trailing slashes, slash, or colon characters. The resulting
string is null if path is null.

File extension - c#

I have a directory that contains jpg,tif,pdf,doc and xls. The client DB conly contains the file names without extension. My app has to pick up the file and upload the file. One of the properties of the upload object is the file extension.
Is there a way of getting file extension if all i have is the path and name
eg:
C:\temp\somepicture.jpg is the file and the information i have through db is
c:\temp\somepicture

Use Directory.GetFiles(fileName + ".*"). If it returns just one file, then you find the file you need. If it returns more than one, you have to choose which to upload.

Something like this maybe:
DirectoryInfo D = new DirectoryInfo(path);
foreach (FileInfo fi in D.GetFiles())
{
if (Path.GetFileNameWithoutExtension(fi.FullName) == whatever)
// do something
}

You could obtain a list of all of the files with that name, regardless of extension:
public string[] GetFileExtensions(string path)
{
System.IO.DirectoryInfo directory =
new System.IO.DirectoryInfo(System.IO.Path.GetDirectoryName(path));
return directory.GetFiles(
System.IO.Path.GetFileNameWithoutExtension(path) + ".*")
.Select(f => f.Extension).ToArray();
}

Obviously, if you have no other information and there are 2 files with the same name and different extensions, you can't do anything (e.g. there is somepicture.jpg and somepicture.png at the same time).
On the other hand, usually that won't be the case so you can simply use a search pattern (e.g. somepicture.*) to find the one and only (if you're lucky) file.

Search for files named somepicture.* in that folder, and upload any that matches ?

Get the lowest level folder for each path. For your example, you would have:
'c:\temp\'
Then find any files that start with your filename in that folder, in this case:
'somepicture'
Finally, grab the extension off the matching filename. If you have duplicates, you would have to handle that in a unique way.

You would have to use System.IO.Directory.GetFiles() and iterate through all the filenames. You will run into issues when you have a collision like somefile.jpg and somefile.tif.
Sounds like you have bigger issues than just this and you may want to make an argument to store the file extension in your database as well to remove the ambiguity.

you could do something like this perhaps....
DirectoryInfo di = new DirectoryInfo("c:/temp/");
FileInfo[] rgFiles = di.GetFiles("somepicture.*");
foreach (FileInfo fi in rgFiles)
{
if(fi.Name.Contains("."))
{
string name = fi.Name.Split('.')[0].ToString();
string ext = fi.Name.Split('.')[1].ToString();
System.Console.WriteLine("Extension is: " + ext);
}
}

One more, with the assumption of no files with same name but different extension.
string[] files = Directory.GetFiles(#"c:\temp", #"testasdadsadsas.*");
if (files.Length >= 1)
{
string fullFilenameAndPath = files[0];
Console.WriteLine(fullFilenameAndPath);
}

From the crippled file path you can get the directory path and the file name:
string path = Path.GetDirectoryName(filename);
string name = Path.GetFileName(filename);
Then you can get all files that matches the file name with any extension:
FileInfo[] found = new DirectoryInfo(path).GetFiles(name + ".*");
If the array contains one item, you have your match. If there is more than one item, you have to decide which one to use, or what to do with them.

All the pieces are here in the existing answers, but just trying to unify them into one answer for you - given the "guaranteed unique" declaration you're working with, you can toss in a FirstOrDefault since you don't need to worry about choosing among multiple potential matches.
static void Main(string[] args)
{
var match = FindMatch(args[0]);
Console.WriteLine("Best match for {0} is {1}", args[0], match ?? "[None found]");
}
private static string FindMatch(string pathAndFilename)
{
return FindMatch(Path.GetDirectoryName(pathAndFilename), Path.GetFileNameWithoutExtension(pathAndFilename));
}
private static string FindMatch(string path, string filename)
{
return Directory.GetFiles(path, filename + ".*").FirstOrDefault();
}
Output:
> ConsoleApplication10 c:\temp\bogus
Best match for c:\temp\bogus is [None found]
> ConsoleApplication10 c:\temp\7z465
Best match for c:\temp\7z465 is c:\temp\7z465.msi
> ConsoleApplication10 c:\temp\boot
Best match for c:\temp\boot is c:\temp\boot.wim