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FileUpload if exist concat (counter) to the name [duplicate]

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FileUpload - if file name exist concat a number between parentheses at the end of name
(3 answers)
Closed 5 years ago.
I have a fileupload control, What I want to achieve is to concat a nuber to it, in order it to be unique.
All the posts that I found are talking about adding a GUID or DateTime
What i want to achieve is if the file exist in folder then the file name will be filename + (counter)
Example:
The folder contain a file name- file.png
1) When I upload the same file name again, the existing one wont get delete and the new one will be called file(1).png.
2) When I upload the same file name again, (file.png)
now the new file will be called file(2)
I have this code which handle the 1'st case but not the second:
public static string GetUniqueName(string fileName)
{
string dir = Globals.Directories.GetCustomCategoryThumbnailDir();
string fileExtension = Path.GetExtension(fileName);
string fileNameWE = Path.GetFileNameWithoutExtension(fileName);
string[] files = Directory.GetFiles(dir, "*" + fileExtension)
.Select(Path.GetFileName)
.ToArray();
string uniqueName = fileNameWE;
int nextNum = 0;
bool fileExist = false;
string pattern = #"(.*)\(([\d]+)\)";
foreach (var file in files)
{
var tempFileName = Path.GetFileNameWithoutExtension(file);
var match = Regex.Match(tempFileName, pattern);
if (tempFileName.Equals(fileNameWE))
{
// file exist in folder
fileExist = true;
}
if (tempFileName.StartsWith(fileNameWE) && match.Success)
{
// there is a file name that start with "fileToUpload" name, we want to to take the number
nextNum = Convert.ToInt32(match.Groups[2].Value);
nextNum++;
}
}
if (nextNum == 0 && !fileExist)
{
// filename dont exist
return fileNameWE + fileExtension;
}
if (nextNum == 0 && fileExist)
{
// the file name exist without (1)
fileNameWE = $"{fileNameWE}(1)";
return fileNameWE + fileExtension;
}
else
{
var haveParentessis = Regex.Match(fileNameWE, pattern);
if (haveParentessis.Success)
{
// we need to reset the nextNum
nextNum = 1;
}
// return the new unique name with suffix
fileNameWE = string.Format("{0}({1})", fileNameWE, nextNum);
return fileNameWE + fileExtension;
}
}
How can I achieve that?

Yeah, that's cause your while loop as pointed below is local to the function and thus the counter variable which is also a local variable won't be maintained it's current value. So in essence every request you get a new page instance and thus your counter will get re-initialized to 0
while (File.Exists(Path.Combine(dir, fileNameWE + fileExtension)))
{
fileNameWE = fileNameWE + "(" + counter.ToString() + ")";
counter++;
}
To get this done, you should store the counter variable in Session and retrieve it back. Don't forget it's an web application and thus the state won't be maintained unless you do it explicitly
if (File.Exists(Path.Combine(dir, fileNameWE + fileExtension)))
{
counter = (Session["counter"] != null) ? ((int)Session["counter"])++ : default(int);
fileNameWE = fileNameWE + "(" + counter.ToString() + ")";
Session["counter"] = counter;
}

I got this to work by using regular expressions, below. No persistent counter is required. I think the concat problem is because there's nothing done to deal with the existing (1) suffix. I coded this potential solution and hope it helps! NB: only lightly tested in debugger, and I am a novice
{
string fileName = #"C:\Uploads\Testfile.bin";
string fileExtension = Path.GetExtension(fileName);
string fileNameWE = Path.GetFileNameWithoutExtension(fileName);
string pattern = #"(.*)\(([\d]+)\)$";
var match = Regex.Match(fileNameWE, pattern);
if (match.Success)
{
int nextNum = Convert.ToInt32(match.Groups[2].Value);
nextNum++;
fileNameWE = $"{match.Groups[1].Value}({nextNum})";
}
else
{
fileNameWE = $"{fileNameWE}(1)";
}
}

C# fail to create file in directory if has other file

Can someone help me, I just learning C# for about 2 month, I have this problem,
i'm building a class for filter data from temp file and create the result in new txt file inside directory, if directory is empty nor at the same date, it build perfectly, and if there another file at same date it should create with increase the last number at lastname.
My problem when I run code, it is not creating if the directory has files with the same dates, then the result should be something like this:
C:\result_2014051301.txt
C:\result_2014051401.txt
C:\result_2014051402.txt <-- Failed, it is not ..2014051401.txt
class Entity2
{
public Entity2()
{
string fileTemp = "DEFAULT.temp";
string indexD = Properties.Settings.Default.ChIndex2D;
string indexC = Properties.Settings.Default.ChIndex2C;
string indexS = Properties.Settings.Default.ChIndex2S;
string tempPath = AppDomain.CurrentDomain.BaseDirectory;
string targetPath = Properties.Settings.Default.ExtractALL_DIR;
string SourceFile = Path.Combine(tempPath, fileTemp);
string tempFileX = Path.GetTempFileName();
if (!System.IO.Directory.Exists(targetPath))
{
System.Windows.Forms.MessageBox.Show("Error missing .temp", "Message Box");
}
else
{
string ext = ".txt";
int sequence = 0;
DateTime dateFileName = DateTime.Today;
string discode = Properties.Settings.Default.ChannelID_2;
string filename = discode + "_" + dateFileName.ToString("yyyyMMdd");
string pathX = Properties.Settings.Default.ExtractALL_DIR + #"/Channel2";
if (!Directory.Exists(pathX))
{
Directory.CreateDirectory(pathX);
}
string[] files = Directory.GetFiles(pathX, filename + "*.txt", SearchOption.TopDirectoryOnly);
if (files.Length > 0)
{
Array.Sort(files);
string lastFilename = files[files.Length - 1];
sequence = Int32.Parse(lastFilename.Substring(0, lastFilename.Length - 4).Replace(pathX + filename, ""));
}
sequence++;
string newFileName = filename + sequence.ToString().PadLeft(2, '0') + ext;
string DestFile = Path.Combine(pathX, newFileName);
using (var ab = new StreamReader(SourceFile))
using (var cd = new StreamWriter(DestFile))
{
string lineX;
while ((lineX = ab.ReadLine()) != null)
{
if (lineX.LastIndexOf("100", 3) != -1 || lineX.LastIndexOf("MGR", 15) != -1 || lineX.LastIndexOf(indexC, 15) != -1)
{
lineX = lineX.Replace(indexD, "");
lineX = lineX.Replace("DEFAULT", discode);
if (lineX.LastIndexOf("800", 3) != -1)
{
lineX = lineX.Replace(indexS, "");
}
cd.WriteLine(lineX);
}
}
}
}
}
}

This piece is not functioning correctly:
Int32.Parse(lastFilename.Substring(0, lastFilename.Length - 4).Replace(pathX + filename, ""));
pathX + filename is C:\folderfile.txt not C:\folder\file.txt.
You either need to add the \ or call Path.Join.
That will cause the Parse operation to fail since it tries to consume the who string (minus the extension).

Automatically rename a file if it already exists in Windows way

My C# code is generating several text files based on input and saving those in a folder. Also, I am assuming that the name of the text file will be same as input.(The input contains only letters)
If two files has same name then it is simply overwriting the previous file.
But I want to keep both files.
I don't want to append current date time or a random number to the 2nd file name. Instead I want to do it the same way Windows does. If the fisrt file name is AAA.txt , then second file name is AAA(2).txt, third file name will be AAA(3).txt.....N th file name will be AAA(N).txt.
string[] allFiles = Directory.GetFiles(folderPath).Select(filename => Path.GetFileNameWithoutExtension(filename)).ToArray();
foreach (var item in allFiles)
{
//newFileName is the txt file which is going to be saved in the provided folder
if (newFileName.Equals(item, StringComparison.InvariantCultureIgnoreCase))
{
// What to do here ?
}
}

This will check for the existence of files with tempFileName and increment the number by one until it finds a name that does not exist in the directory.
int count = 1;
string fileNameOnly = Path.GetFileNameWithoutExtension(fullPath);
string extension = Path.GetExtension(fullPath);
string path = Path.GetDirectoryName(fullPath);
string newFullPath = fullPath;
while(File.Exists(newFullPath))
{
string tempFileName = string.Format("{0}({1})", fileNameOnly, count++);
newFullPath = Path.Combine(path, tempFileName + extension);
}

With this code if file name is "Test (3).txt" then it will become "Test (4).txt".
public static string GetUniqueFilePath(string filePath)
{
if (File.Exists(filePath))
{
string folderPath = Path.GetDirectoryName(filePath);
string fileName = Path.GetFileNameWithoutExtension(filePath);
string fileExtension = Path.GetExtension(filePath);
int number = 1;
Match regex = Regex.Match(fileName, #"^(.+) \((\d+)\)$");
if (regex.Success)
{
fileName = regex.Groups[1].Value;
number = int.Parse(regex.Groups[2].Value);
}
do
{
number++;
string newFileName = $"{fileName} ({number}){fileExtension}";
filePath = Path.Combine(folderPath, newFileName);
}
while (File.Exists(filePath));
}
return filePath;
}

The other examples don't take into account the filename / extension.
Here you go:
public static string GetUniqueFilename(string fullPath)
{
if (!Path.IsPathRooted(fullPath))
fullPath = Path.GetFullPath(fullPath);
if (File.Exists(fullPath))
{
String filename = Path.GetFileName(fullPath);
String path = fullPath.Substring(0, fullPath.Length - filename.Length);
String filenameWOExt = Path.GetFileNameWithoutExtension(fullPath);
String ext = Path.GetExtension(fullPath);
int n = 1;
do
{
fullPath = Path.Combine(path, String.Format("{0} ({1}){2}", filenameWOExt, (n++), ext));
}
while (File.Exists(fullPath));
}
return fullPath;
}

How about just:
int count = 1;
String tempFileName = newFileName;
foreach (var item in allFiles)
{
if (tempFileName.Equals(item, StringComparison.InvariantCultureIgnoreCase))
{
tempFileName = String.Format("{0}({1})", newFileName, count++);
}
}
This will use the original file name if it's not there, if not it'll take a new file name with the index in brackets (although this code isn't taking the extension into account). If the newly generated name "text(001)" is used then it'll increment until it finds a valid unused file name.

public static string AutoRenameFilename(FileInfo file)
{
var filename = file.Name.Replace(file.Extension, string.Empty);
var dir = file.Directory.FullName;
var ext = file.Extension;
if (file.Exists)
{
int count = 0;
string added;
do
{
count++;
added = "(" + count + ")";
} while (File.Exists(dir + "\\" + filename + " " + added + ext));
filename += " " + added;
}
return (dir + filename + ext);
}

int count= 0;
file is the name of file
while (File.Exists(fullpathwithfilename)) //this will check for existence of file
{
// below line names new file from file.xls to file1.xls
fullpathwithfilename= fullpathwithfilename.Replace("file.xls", "file"+count+".xls");
count++;
}

I was looking for a solution that would move a file, and make sure that if the destination file name is not already taken. It would follow the same logic as Windows and append a number, with brackets after the duplicate file.
The top answer, thanks to #cadrell0, helped me arrive to the following solution:
/// <summary>
/// Generates full file path for a file that is to be moved to a destinationFolderDir.
///
/// This method takes into account the possiblity of the file already existing,
/// and will append number surrounded with brackets to the file name.
///
/// E.g. if D:\DestinationDir contains file name file.txt,
/// and your fileToMoveFullPath is D:\Source\file.txt, the generated path will be D:\DestinationDir\file(1).txt
///
/// </summary>
/// <param name="destinationFolderDir">E.g. D:\DestinationDir </param>
/// <param name="fileToMoveFullPath">D:\Source\file.txt</param>
/// <returns></returns>
public string GetFullFilePathWithDuplicatesTakenInMind(string destinationFolderDir, string fileToMoveFullPath)
{
string destinationPathWithDuplicatesTakenInMind;
string fileNameWithExtension = Path.GetFileName(fileToMoveFullPath);
string fileNameWithoutExtension = Path.GetFileNameWithoutExtension(fileToMoveFullPath);
string fileNameExtension = Path.GetExtension(fileToMoveFullPath);
destinationPathWithDuplicatesTakenInMind = Path.Combine(destinationFolderDir, fileNameWithExtension);
int count = 0;
while (File.Exists(destinationPathWithDuplicatesTakenInMind))
{
destinationPathWithDuplicatesTakenInMind = Path.Combine(destinationFolderDir, $"{fileNameWithoutExtension}({count}){fileNameExtension}");
count = count + 1; // sorry, not a fan of the ++ operator.
}
return destinationPathWithDuplicatesTakenInMind;
}

With regard to Giuseppe's comment on the way windows renames files I worked on a version that finds any existing index i.e. (2) in the file name and renames the file as per windows accordingly. The sourceFileName is assumed to be valid and the user is assumed to have write permission on the destination folder by this point:
using System.IO;
using System.Text.RegularExpressions;
private void RenameDiskFileToMSUnique(string sourceFileName)
{
string destFileName = "";
long n = 1;
// ensure the full path is qualified
if (!Path.IsPathRooted(sourceFileName)) { sourceFileName = Path.GetFullPath(sourceFileName); }
string filepath = Path.GetDirectoryName(sourceFileName);
string fileNameWOExt = Path.GetFileNameWithoutExtension(sourceFileName);
string fileNameSuffix = "";
string fileNameExt = Path.GetExtension(sourceFileName);
// if the name includes the text "(0-9)" then we have a filename, instance number and suffix
Regex r = new Regex(#"\(\d+\)");
Match match = r.Match(fileNameWOExt);
if (match.Success) // the pattern (0-9) was found
{
// text after the match
if (fileNameWOExt.Length > match.Index + match.Length) // remove the format and create the suffix
{
fileNameSuffix = fileNameWOExt.Substring(match.Index + match.Length, fileNameWOExt.Length - (match.Index + match.Length));
fileNameWOExt = fileNameWOExt.Substring(0, match.Index);
}
else // remove the format at the end
{
fileNameWOExt = fileNameWOExt.Substring(0, fileNameWOExt.Length - match.Length);
}
// increment the numeric in the name
n = Convert.ToInt64(match.Value.Substring(1, match.Length - 2)) + 1;
}
// format variation: indexed text retains the original layout, new suffixed text inserts a space!
do
{
if (match.Success) // the text was already indexed
{
if (fileNameSuffix.Length > 0)
{
destFileName = Path.Combine(filepath, String.Format("{0}({1}){2}{3}", fileNameWOExt, (n++), fileNameSuffix, fileNameExt));
}
else
{
destFileName = Path.Combine(filepath, String.Format("{0}({1}){2}", fileNameWOExt, (n++), fileNameExt));
}
}
else // we are adding a new index
{
destFileName = Path.Combine(filepath, String.Format("{0} ({1}){2}", fileNameWOExt, (n++), fileNameExt));
}
}
while (File.Exists(destFileName));
File.Copy(sourceFileName, destFileName);
}

You can declare a Dictionary<string,int> to keep the number of times each root file name was saved. After that, on your Save method, just increase the counter and append it to the base file name:
var key = fileName.ToLower();
string newFileName;
if(!_dictionary.ContainsKey(key))
{
newFileName = fileName;
_dictionary.Add(key,0);
}
else
{
_dictionary[key]++;
newFileName = String.Format("{0}({1})", fileName, _dictionary[key])
}
This way, you'll have a counter for each distinct file name: AAA(1), AAA(2); BBB(1)...

It's working fine now. thanks guys for the answers..
string[] allFiles = Directory.GetFiles(folderPath).Select(filename => Path.GetFileNameWithoutExtension(filename)).ToArray();
string tempFileName = fileName;
int count = 1;
while (allFiles.Contains(tempFileName ))
{
tempFileName = String.Format("{0} ({1})", fileName, count++);
}
output = Path.Combine(folderPath, tempFileName );
string fullPath=output + ".xml";

c# service renaming files!

I have a windows service , that takes files with metadata(FIDEF) and corresponding video file and , translates the XML(FIDEF) using XSLT .
I get the file directory listing for FIDEF's and if a video file of the same name exists it translates it. That works ok , but it is on a timer to search every minute. I am trying to handle situations where the same file name enters the input directory but is already in the output directory. I just have it changing the output name to (copy) thus if another file enters i should get (copy)(copy).mov but the service won't start with filenames of the same directory already in the output , it works once and then does not seem to pick up any new files.
Any Help would be great as I have tried a few things with no good results. I believe its the renaming methods, but I've put most of the code up in case its a clean up issue or something else.
(forgive some of the names just trying different things).
private void getFileList()
{
//Get FILE LIST FROM Directory
try
{
// Process Each String/File In Directory
string result;
//string filename;
filepaths = null;
filepaths = Directory.GetFiles(path, Filetype);
foreach (string s in filepaths)
{
for (int i = 0; i < filepaths.Length; i++)
{
//Result Returns Video Name
result = Path.GetFileNameWithoutExtension(filepaths[i]);
FileInfo f = new FileInfo(filepaths[i]);
PreformTranslation(f, outputPath + result , result);
}
}
}
catch (Exception e)
{
EventLog.WriteEntry("Error " + e);
}
}
private void MoveVideoFiles(String Input, String Output)
{
File.Move(Input, Output);
}
private string GetUniqueName(string name)
{
//Original Filename
String ValidName = name;
//remove FIDEF from filename
String Justname1 = Path.GetFileNameWithoutExtension(name);
//get .mov extension
String Extension2 = Path.GetExtension(Justname1);
//get filename with NO extensions
String Justname = Path.GetFileNameWithoutExtension(Justname1);
//get .Fidef
String Extension = Path.GetExtension(name);
int cnt = 0;
//string[] FileName = Justname.Split('(');
//string Name = FileName[0];
while (File.Exists(ValidName)==true)
{
ValidName = outputPath + Justname + "(Copy)" + Extension2 + Extension;
cnt++;
}
return ValidName;
}
private string getMovFile(string name)
{
String ValidName = name;
String Ext = Path.GetExtension(name);
String JustName = Path.GetFileNameWithoutExtension(name);
while(File.Exists(ValidName))
{
ValidName = outputPath + JustName + "(Copy)" + Ext;
}
return ValidName;
}
//Preforms the translation requires XSL & FIDEF name.
private void PreformTranslation(FileInfo FileName, String OutputFileName , String result)
{
string FidefName = OutputFileName + ".FIDEF";
String CopyName;
String copyVidName = outputPath + result;
XslCompiledTransform myXslTransform;
myXslTransform = new XslCompiledTransform();
try
{
myXslTransform.Load(XSLname);
}
catch
{
EventLog.WriteEntry("Error in loading XSL");
}
try
{ //only process FIDEF's with corresponding Video file
if (AllFidef == "no")
{
//Check if video exists if yes,
if (File.Exists(path + result))
{
//Check for FIDEF File Already Existing in the Output Directory.
if (File.Exists(FidefName))
{
//Get unique name
CopyName = GetUniqueName(FidefName);
copyVidName= getMovFile(copyVidName);
//Translate and create new FIDEF.
//double checking the file is here
if (File.Exists(outputPath + result))
{
myXslTransform.Transform(FileName.ToString(), CopyName);
File.Delete(FileName.ToString());
MoveVideoFiles(path + result, copyVidName);
}
////Move Video file with Corresponding Name.
}
else
{ //If no duplicate file exsists in Directory just move.
myXslTransform.Transform(FileName.ToString(), OutputFileName + ".FIDEF");
MoveVideoFiles(path + result, outputPath + result);
}
}
}
else
{
//Must have FIDEF extension
//Processes All FIDEFS and moves any video files if found.
myXslTransform.Transform(FileName.ToString(), OutputFileName + ".FIDEF");
if (File.Exists(path + result))
{
MoveVideoFiles(path + result, outputPath + result);
}
}
}
catch (Exception e)
{
EventLog.WriteEntry("Error Transforming " + "FILENAME = " + FileName.ToString()
+ " OUTPUT_FILENAME = " + OutputFileName + "\r\n" +"\r\n"+ e);
}
}

There is a lot wrong with your code. getFileList has the unneeded inner for loop for starters. Get rid of it. Your foreach loop has s, which can replace filepaths[i] from your for loop. Also, don't do outputPath + result to make file paths. Use Path.Combine(outputPath, result) instead, since Path.Combine handles directory characters for you. Also, you need to come up with a better name for getFileList, since that is not what the method does at all. Do not make your method names liars.
I would simply get rid of MoveVideoFiles. The compiler just might too.
GetUniqueName only works if your file name is of the form name.mov.fidef, which I'm assuming it is. You really need better variable names though, otherwise it will be a maintenance nightware later on. I would get rid of the == true in the while loop condition, but that is optional. The assignment inside the while is why your files get overwritten. You always generate the same name (something(Copy).mov.fidef), and as far as I can see, if the file exists, I think you blow the stack looping forever. You need to fix that loop to generate a new name (and don't forget Path.Combine). Maybe something like this (note this is untested):
int copyCount = 0;
while (File.Exists(ValidName))
{
const string CopyName = "(Copy)";
string copyString = copyCount == 0 ? CopyName : (CopyName + "(" + copyCount + ")");
string tempName = Justname + copyString + Extension2 + Extension;
ValidName = Path.Combine(outputPath, tempName);
copyCount++;
}
This generates something(Copy).mov.fidef for the first copy, something(Copy)(2).mov.fidef for the second, and so on. Maybe not what you want, but you can make adjustments.
At this point you have a lot to do. getMovFile looks as though it could use work in the same manner as GetUniqueName. You'll figure it out. Good luck.

How would you make a unique filename by adding a number?

I would like to create a method which takes either a filename as a string or a FileInfo and adds an incremented number to the filename if the file exists. But can't quite wrap my head around how to do this in a good way.
For example, if I have this FileInfo
var file = new FileInfo(#"C:\file.ext");
I would like the method to give me a new FileInfo with C:\file 1.ext if C:\file.ext
existed, and C:\file 2.ext if C:\file 1.ext existed and so on. Something like this:
public FileInfo MakeUnique(FileInfo fileInfo)
{
if(fileInfo == null)
throw new ArgumentNullException("fileInfo");
if(!fileInfo.Exists)
return fileInfo;
// Somehow construct new filename from the one we have, test it,
// then do it again if necessary.
}

public FileInfo MakeUnique(string path)
{
string dir = Path.GetDirectoryName(path);
string fileName = Path.GetFileNameWithoutExtension(path);
string fileExt = Path.GetExtension(path);
for (int i = 1; ;++i) {
if (!File.Exists(path))
return new FileInfo(path);
path = Path.Combine(dir, fileName + " " + i + fileExt);
}
}
Obviously, this is vulnerable to race conditions as noted in other answers.

Lots of good advice here. I ended up using a method written by Marc in an answer to a different question. Reformatted it a tiny bit and added another method to make it a bit easier to use "from the outside". Here is the result:
private static string numberPattern = " ({0})";
public static string NextAvailableFilename(string path)
{
// Short-cut if already available
if (!File.Exists(path))
return path;
// If path has extension then insert the number pattern just before the extension and return next filename
if (Path.HasExtension(path))
return GetNextFilename(path.Insert(path.LastIndexOf(Path.GetExtension(path)), numberPattern));
// Otherwise just append the pattern to the path and return next filename
return GetNextFilename(path + numberPattern);
}
private static string GetNextFilename(string pattern)
{
string tmp = string.Format(pattern, 1);
if (tmp == pattern)
throw new ArgumentException("The pattern must include an index place-holder", "pattern");
if (!File.Exists(tmp))
return tmp; // short-circuit if no matches
int min = 1, max = 2; // min is inclusive, max is exclusive/untested
while (File.Exists(string.Format(pattern, max)))
{
min = max;
max *= 2;
}
while (max != min + 1)
{
int pivot = (max + min) / 2;
if (File.Exists(string.Format(pattern, pivot)))
min = pivot;
else
max = pivot;
}
return string.Format(pattern, max);
}
Only partially tested it so far, but will update if I find any bugs with it. (Marcs code works nicely!) If you find any problems with it, please comment or edit or something :)

Not pretty, but I've had this for a while :
private string getNextFileName(string fileName)
{
string extension = Path.GetExtension(fileName);
int i = 0;
while (File.Exists(fileName))
{
if (i == 0)
fileName = fileName.Replace(extension, "(" + ++i + ")" + extension);
else
fileName = fileName.Replace("(" + i + ")" + extension, "(" + ++i + ")" + extension);
}
return fileName;
}
Assuming the files already exist:
File.txt
File(1).txt
File(2).txt
the call getNextFileName("File.txt") will return "File(3).txt".
Not the most efficient because it doesn't use binary search, but should be ok for small file count. And it doesn't take race condition into account...

If checking if the file exists is too hard you can always just add a date and time to the file name to make it unique:
FileName.YYYYMMDD.HHMMSS
Maybe even add milliseconds if necessary.

If the format doesn't bother you then you can call:
try{
string tempFile=System.IO.Path.GetTempFileName();
string file=System.IO.Path.GetFileName(tempFile);
//use file
System.IO.File.Delete(tempFile);
}catch(IOException ioe){
//handle
}catch(FileIOPermission fp){
//handle
}
PS:- Please read more about this at msdn before using.

/// <summary>
/// Create a unique filename for the given filename
/// </summary>
/// <param name="filename">A full filename, e.g., C:\temp\myfile.tmp</param>
/// <returns>A filename like C:\temp\myfile633822247336197902.tmp</returns>
public string GetUniqueFilename(string filename)
{
string basename = Path.Combine(Path.GetDirectoryName(filename),
Path.GetFileNameWithoutExtension(filename));
string uniquefilename = string.Format("{0}{1}{2}",
basename,
DateTime.Now.Ticks,
Path.GetExtension(filename));
// Thread.Sleep(1); // To really prevent collisions, but usually not needed
return uniquefilename;
}
As DateTime.Ticks has a resolution of 100 nanoseconds, collisions are extremely unlikely. However, a Thread.Sleep(1) will ensure that, but I doubt that it's needed

Insert a new GUID into the file name.

I must throw my 2-cents in. This is how I did it and it works for my use.
private static string IterateFileName(string fileName)
{
if (!File.Exists(fileName)) return fileName;
FileInfo fi = new FileInfo(fileName);
string ext = fi.Extension;
string name = fi.FullName.Substring(0, fi.FullName.Length - ext.Length);
int i = 2;
while (File.Exists($"{name}_{i}{ext}"))
{
i++;
}
return $"{name}_{i}{ext}";
}

The idea is to get a list of the existing files, parse out the numbers, then make the next highest one.
Note: This is vulnerable to race conditions, so if you have more than one thread creating these files, be careful.
Note 2: This is untested.
public static FileInfo GetNextUniqueFile(string path)
{
//if the given file doesn't exist, we're done
if(!File.Exists(path))
return new FileInfo(path);
//split the path into parts
string dirName = Path.GetDirectoryName(path);
string fileName = Path.GetFileNameWithoutExtension(path);
string fileExt = Path.GetExtension(path);
//get the directory
DirectoryInfo dir = new DirectoryInfo(dir);
//get the list of existing files for this name and extension
var existingFiles = dir.GetFiles(Path.ChangeExtension(fileName + " *", fileExt);
//get the number strings from the existing files
var NumberStrings = from file in existingFiles
select Path.GetFileNameWithoutExtension(file.Name)
.Remove(0, fileName.Length /*we remove the space too*/);
//find the highest existing number
int highestNumber = 0;
foreach(var numberString in NumberStrings)
{
int tempNum;
if(Int32.TryParse(numberString, out tempnum) && tempNum > highestNumber)
highestNumber = tempNum;
}
//make the new FileInfo object
string newFileName = fileName + " " + (highestNumber + 1).ToString();
newFileName = Path.ChangeExtension(fileName, fileExt);
return new FileInfo(Path.Combine(dirName, newFileName));
}

Instead of poking the disk a number of times to find out if it has a particular variant of the desired file name, you could ask for the list of files that already exist and find the first gap according to your algorithm.
public static class FileInfoExtensions
{
public static FileInfo MakeUnique(this FileInfo fileInfo)
{
if (fileInfo == null)
{
throw new ArgumentNullException("fileInfo");
}
string newfileName = new FileUtilities().GetNextFileName(fileInfo.FullName);
return new FileInfo(newfileName);
}
}
public class FileUtilities
{
public string GetNextFileName(string fullFileName)
{
if (fullFileName == null)
{
throw new ArgumentNullException("fullFileName");
}
if (!File.Exists(fullFileName))
{
return fullFileName;
}
string baseFileName = Path.GetFileNameWithoutExtension(fullFileName);
string ext = Path.GetExtension(fullFileName);
string filePath = Path.GetDirectoryName(fullFileName);
var numbersUsed = Directory.GetFiles(filePath, baseFileName + "*" + ext)
.Select(x => Path.GetFileNameWithoutExtension(x).Substring(baseFileName.Length))
.Select(x =>
{
int result;
return Int32.TryParse(x, out result) ? result : 0;
})
.Distinct()
.OrderBy(x => x)
.ToList();
var firstGap = numbersUsed
.Select((x, i) => new { Index = i, Item = x })
.FirstOrDefault(x => x.Index != x.Item);
int numberToUse = firstGap != null ? firstGap.Item : numbersUsed.Count;
return Path.Combine(filePath, baseFileName) + numberToUse + ext;
}
}

Here's one that decouples the numbered naming question from the check of the filesystem:
/// <summary>
/// Finds the next unused unique (numbered) filename.
/// </summary>
/// <param name="fileName">Name of the file.</param>
/// <param name="inUse">Function that will determine if the name is already in use</param>
/// <returns>The original filename if it wasn't already used, or the filename with " (n)"
/// added to the name if the original filename is already in use.</returns>
private static string NextUniqueFilename(string fileName, Func<string, bool> inUse)
{
if (!inUse(fileName))
{
// this filename has not been seen before, return it unmodified
return fileName;
}
// this filename is already in use, add " (n)" to the end
var name = Path.GetFileNameWithoutExtension(fileName);
var extension = Path.GetExtension(fileName);
if (name == null)
{
throw new Exception("File name without extension returned null.");
}
const int max = 9999;
for (var i = 1; i < max; i++)
{
var nextUniqueFilename = string.Format("{0} ({1}){2}", name, i, extension);
if (!inUse(nextUniqueFilename))
{
return nextUniqueFilename;
}
}
throw new Exception(string.Format("Too many files by this name. Limit: {0}", max));
}
And here's how you might call it if you are using the filesystem
var safeName = NextUniqueFilename(filename, f => File.Exists(Path.Combine(folder, f)));

private async Task<CloudBlockBlob> CreateBlockBlob(CloudBlobContainer container, string blobNameToCreate)
{
var blockBlob = container.GetBlockBlobReference(blobNameToCreate);
var i = 1;
while (await blockBlob.ExistsAsync())
{
var newBlobNameToCreate = CreateRandomFileName(blobNameToCreate,i.ToString());
blockBlob = container.GetBlockBlobReference(newBlobNameToCreate);
i++;
}
return blockBlob;
}
private string CreateRandomFileName(string fileNameWithExtension, string prefix=null)
{
int fileExtPos = fileNameWithExtension.LastIndexOf(".", StringComparison.Ordinal);
if (fileExtPos >= 0)
{
var ext = fileNameWithExtension.Substring(fileExtPos, fileNameWithExtension.Length - fileExtPos);
var fileName = fileNameWithExtension.Substring(0, fileExtPos);
return String.Format("{0}_{1}{2}", fileName, String.IsNullOrWhiteSpace(prefix) ? new Random().Next(int.MinValue, int.MaxValue).ToString():prefix,ext);
}
//This means there is no Extension for the file and its fine attaching random number at the end.
return String.Format("{0}_{1}", fileNameWithExtension, new Random().Next(int.MinValue, int.MaxValue));
}
I use this code to create a consecutive _1,_2,_3 etc.. file name everytime a file exists in the blob storage.

Hope this self iterating function may help. It works fine for me.
public string getUniqueFileName(int i, string filepath, string filename)
{
string path = Path.Combine(filepath, filename);
if (System.IO.File.Exists(path))
{
string name = Path.GetFileNameWithoutExtension(filename);
string ext = Path.GetExtension(filename);
i++;
filename = getUniqueFileName(i, filepath, name + "_" + i + ext);
}
return filename;
}

This is an answer to question in this Link, but they marked it as a duplicate, so I post my answer here.
I created this proof of concept class (may contain bugs).
More explanation in code comments.
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
namespace ConsoleApp
{
class Program
{
static void Main( string[] args )
{
var testFilePaths = new List<string>
{
#"c:\test\file.txt",
#"c:\test\file(1).txt",
#"c:\test\file(2).txt",
#"c:\TEST2\file(3).txt",
#"c:\test\file(5).txt",
#"c:\test\file(5)abc.txt",
#"c:\test\file(5).avi"
};
// inspect in debbuger for correct values
var withSuffix = new DecomposedFilePath( "c:\\files\\file(13).txt");
var withoutSuffix = new DecomposedFilePath( "c:\\files\\file(abc).txt");
var withExtraNumber = new DecomposedFilePath( "c:\\files\\file(34)xyz(35).txt"); // "(34)" in the middle should be ignored
DecomposedFilePath changedSuffix = withExtraNumber.ReplaceSuffix( 1999 ); // "file(34)xyz(35).txt" -> "file(34)xyz(1999).txt"
DecomposedFilePath removedSuffix = changedSuffix.ReplaceSuffix( null ); // "file(34)xyz(1999).txt" -> "file(34)xyz.txt"
var testPath = new DecomposedFilePath( "c:\\test\\file.txt");
DecomposedFilePath nextPath1 = testPath.GetFirstFreeFilePath( testFilePaths );
// update our list
testFilePaths.Add( nextPath1.FullFilePath );
DecomposedFilePath nextPath2 = testPath.GetFirstFreeFilePath( testFilePaths );
testFilePaths.Add( nextPath2.FullFilePath );
DecomposedFilePath nextPath3 = testPath.GetFirstFreeFilePath( testFilePaths );
}
}
public sealed class DecomposedFilePath
{
public DecomposedFilePath( string filePath )
{
FullFilePath = Path.GetFullPath( filePath );
}
// "c:\myfiles\file(4).txt"
public string FullFilePath { get; }
// "file" or "file(1)"
public string FileNameWithoutExt => Path.GetFileNameWithoutExtension( FullFilePath );
// "file(13)" -> "file"
public string FileNameWithoutExtAndSuffix => FileNameWithoutExt.Substring( 0, FileNameWithoutExt.Length - Suffix.Length ); // removes suffix
// ".txt"
public string Extenstion => Path.GetExtension( FullFilePath );
// "c:\myfiles"
public string DirectoryPath => Path.GetDirectoryName( FullFilePath );
// "file(23)" -> "23", file -> stirng.Empty
public string Suffix
{
get
{
// we want to extract suffix from file name, e.g. "(34)" from "file(34)"
// I am not good at regex, but I hope it will work correctly
var regex = new Regex( #"\([0-9]+\)$" );
Match match = regex.Match( FileNameWithoutExt );
if (!match.Success) return string.Empty; // suffix not found
return match.Value; // return "(number)"
}
}
// tranlates suffix "(33)" to 33. If suffix is does not exist (string.empty), returns null (int?)
public int? SuffixAsInt
{
get
{
if (Suffix == string.Empty) return null;
string numberOnly = Suffix.Substring( 1, Suffix.Length - 2 ); // remove '(' from beginning and ')' from end
return int.Parse( numberOnly );
}
}
// e.g. input is suffix: 56 then it changes file name from "file(34)" to "file(56)"
public DecomposedFilePath ReplaceSuffix( int? suffix ) // null - removes suffix
{
string strSuffix = suffix is null ? string.Empty : $"({suffix})"; // add ( and )
string path = Path.Combine( DirectoryPath, FileNameWithoutExtAndSuffix + strSuffix + Extenstion ); // build full path
return new DecomposedFilePath( path );
}
public DecomposedFilePath GetFirstFreeFilePath( IEnumerable<string> filesInDir )
{
var decomposed = filesInDir
// convert all paths to our class
.Select( x => new DecomposedFilePath( x ) )
// pick files only with the same extensionm as our base file, ignore case
.Where( x => string.Equals( Extenstion, x.Extenstion, StringComparison.OrdinalIgnoreCase) )
// pick files only with the same name (ignoring suffix)
.Where( x => string.Equals( FileNameWithoutExtAndSuffix, x.FileNameWithoutExtAndSuffix, StringComparison.OrdinalIgnoreCase) )
// with the same directory
.Where( x => string.Equals( DirectoryPath, x.DirectoryPath, StringComparison.OrdinalIgnoreCase) )
.ToList(); // create copy for easier debugging
if (decomposed.Count == 0) return this; // no name collision
int? firstFreeSuffix = Enumerable.Range( 1, int.MaxValue) // start numbering duplicates from 1
.Select( x => (int?) x) // change to int? because SuffixAsInt is of that type
.Except( decomposed.Select( x => x.SuffixAsInt) ) // remove existing suffixes
.First(); // get first free suffix
return ReplaceSuffix( firstFreeSuffix );
}
public override string ToString() => FullFilePath;
}
}

This is just a string operation; find the location in the filename string where you want to insert the number, and re-construct a new string with the number inserted. To make it re-usable, you might want to look for a number in that location, and parse it out into an integer, so you can increment it.
Please note that this in general this way of generating a unique filename is insecure; there are obvious race condition hazards.
There might be ready-made solutions for this in the platform, I'm not up to speed with C# so I can't help there.

Take a look at the methods in the Path class, specifically Path.GetFileNameWithoutExtension(), and Path.GetExtension().
You may even find Path.GetRandomFileName() useful!
Edit:
In the past, I've used the technique of attempting to write the file (with my desired name), and then using the above functions to create a new name if an appropriate IOException is thrown, repeating until successful.

This method will add a index to existing file if needed:
If the file exist, find the position of the last underscore. If the content after the underscore is a number, increase this number. otherwise add first index. repeat until unused file name found.
static public string AddIndexToFileNameIfNeeded(string sFileNameWithPath)
{
string sFileNameWithIndex = sFileNameWithPath;
while (File.Exists(sFileNameWithIndex)) // run in while scoop so if after adding an index the the file name the new file name exist, run again until find a unused file name
{ // File exist, need to add index
string sFilePath = Path.GetDirectoryName(sFileNameWithIndex);
string sFileName = Path.GetFileNameWithoutExtension(sFileNameWithIndex);
string sFileExtension = Path.GetExtension(sFileNameWithIndex);
if (sFileName.Contains('_'))
{ // Need to increase the existing index by one or add first index
int iIndexOfUnderscore = sFileName.LastIndexOf('_');
string sContentAfterUnderscore = sFileName.Substring(iIndexOfUnderscore + 1);
// check if content after last underscore is a number, if so increase index by one, if not add the number _01
int iCurrentIndex;
bool bIsContentAfterLastUnderscoreIsNumber = int.TryParse(sContentAfterUnderscore, out iCurrentIndex);
if (bIsContentAfterLastUnderscoreIsNumber)
{
iCurrentIndex++;
string sContentBeforUnderscore = sFileName.Substring(0, iIndexOfUnderscore);
sFileName = sContentBeforUnderscore + "_" + iCurrentIndex.ToString("000");
sFileNameWithIndex = sFilePath + "\\" + sFileName + sFileExtension;
}
else
{
sFileNameWithIndex = sFilePath + "\\" + sFileName + "_001" + sFileExtension;
}
}
else
{ // No underscore in file name. Simple add first index
sFileNameWithIndex = sFilePath + "\\" + sFileName + "_001" + sFileExtension;
}
}
return sFileNameWithIndex;
}

I did it like this:
for (int i = 0; i <= 500; i++) //I suppose the number of files will not pass 500
{ //Checks if C:\log\log+TheNumberOfTheFile+.txt exists...
if (System.IO.File.Exists(#"C:\log\log"+conta_logs+".txt"))
{
conta_logs++;//If exists, then increment the counter
}
else
{ //If not, then the file is created
var file = System.IO.File.Create(#"C:\log\log" + conta_logs + ".txt");
break; //When the file is created we LEAVE the *for* loop
}
}
I think this version is not so hard like the others, and It's a straightforward answer for what the user wanted.

If you need just a unique file name, so, how about this?
Path.GetRandomFileName()

I ran into this problem and, since none of the other answers seemed to have solved it in the way I wanted to, I did it on my own.
static string CheckIfFileExists(string filePath)
{
if (File.Exists(filePath))
{
string parentDir = Directory.GetParent(filePath).FullName;
string fileName = new DirectoryInfo(filePath).Name;
string extension = Path.GetExtension(fileName);
fileName = Path.GetFileNameWithoutExtension(fileName);
if (CheckIfFileNameHasIndex(fileName))
{
string strIndex = fileName[(fileName.LastIndexOf('(')+1)..fileName.LastIndexOf(')')]; //range
int index = int.Parse(strIndex);
index++;
fileName = fileName.Substring(0, fileName.LastIndexOf('(')) + "(" + index + ')';
filePath = Path.Combine(parentDir, fileName + extension);
return CheckIfFileExists(filePath);
}
else
{
fileName = fileName + " (1)";
filePath = Path.Combine(parentDir, fileName + extension);
return CheckIfFileExists(filePath);
}
}
return filePath;
}
//checks if filename has an index (e.g. "file(2).jpg")
static bool CheckIfFileNameHasIndex(string fileName)
{
bool isSuccessful = false;
if (fileName.LastIndexOf('(')!=-1 && fileName.LastIndexOf(')')!=-1)
{
string index = fileName[(fileName.LastIndexOf('(')+1)..fileName.LastIndexOf(')')]; //range
int result;
isSuccessful = int.TryParse(index, out result);
}
return isSuccessful;
}
The method CheckIfFileExists is recursive, so in theory it should be able to handle a potentially unlimited number of duplicates (e.g. "file (3484939).txt"). Of course, in reality, what happens is that the maximum imposed filename length of your operating system and stuff like eventually become a bottleneck.

I have written a method that returns "next" file name with number.
Supports numbering from 1 to 99.
Examples:
C:\Recovery.txt → C:\Recovery1.txt
C:\Recovery1.txt → C:\Recovery2.txt
How to call:
while (File.Exists( path ))
path = NextFileNum( path );
internal static string NextFileNum( string path )
{
string filename = Path.GetFileNameWithoutExtension( path );
string ext = Path.GetExtension( path );
string dir = Path.GetDirectoryName( path );
for (int i = 99; i > 0; i--)
{
if (filename.EndsWith( i.ToString() ))
{
string suffix = ( i + 1 ).ToString();
filename = filename.Substring( 0, filename.Length - suffix.Length ) + suffix;
return Path.Combine( dir, filename + ext );
}
}
filename = filename + "1";
return Path.Combine( dir, filename + ext );
}

public static string MakeUniqueFilePath(string filePath)
{
if (!File.Exists(filePath)) return filePath;
var directory = Path.GetDirectoryName(filePath);
var fileName = Path.GetFileNameWithoutExtension(filePath);
var fileExt = Path.GetExtension(filePath);
var i = 1;
do
{
filePath = Path.Combine(directory, fileName + "(" + i + ")" + fileExt);
i++;
} while (File.Exists(filePath));
return filePath;
}
Returns files like so:
test.txt
test(1).txt
test(2).txt
etc.
Notes:
Can handle filenames without extensions
Can Handle directories included in the file path.
Does not handle file creation race conditions when saving.