How do I automatically put the following number behind the file name?

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Hello, I have problém with file name. I would like to put following number to file name. My code didn´t work.

What I have tried:

 int value = 0;
for (int i = 1; i < 10; i++)
   {
   value = i;
   };
            filePath_output = Path.GetFileName(filePath_input);
            filePath_output = Path.GetDirectoryName(filePath_input) + "\\" + "Vystup"+ value);
            
            this.textBox2.Text = filePath_output;

Posted 30-Sep-20 1:50am

dejf111

Updated 30-Sep-20 2:33am

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Pete O'Hanlon 30-Sep-20 8:11am

What do you mean when you say it doesn't work? What are you expecting to see when you run it?

dejf111 30-Sep-20 8:16am

I would like to see "filename n" n=series of numbers depends on the number of saves
but this do nothing beacuse program expected some diffrent thing

dejf111 30-Sep-20 8:21am

I´m idiot :D so sorry I see it

Pete O'Hanlon 30-Sep-20 8:34am

You're not an idiot. Sometimes it just takes explaining a problem to someone else to see it.

2 solutions

Solution 1

Your for loop doesn't actually do anything - you might as well assign 9 to the value variable to start with.

You'll need to extract the original filename from the path. You'll probably also want to put the number before the file extension.

C#

public static string AppendFileNumber(string filePath, int fileNumber)
{
    string directory = Path.GetDirectoryName(filePath);
    string fileName = Path.GetFileNameWithoutExtension(filePath);
    string extension = Path.GetExtension(filePath);
    return Path.Combine(directory, fileName + " " + fileName + extension);
}

...

int value = 9;
this.textBox2.Text = AppendFileNumber(filePath_input, value);

Posted 30-Sep-20 2:25am

Richard Deeming

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Pete O'Hanlon · Accepted Answer · 2020-09-30T02:34:00

If what you are after is to get something like the following:

c:\myfolder\file.doc
c:\myfolder\file1.doc
c:\myfolder\file2.doc

then your logic needs quite a bit of work. First, break your problem down.

Step 1. Does the file already exist?

C#

public string GetUniqueFilename(string file)
{
  if (File.Exists(file))
  {
    // The file already exists, so get a new filename
  }
  return file;
}

The next stage is to split the file name, extension and path into their most basic parts:

C#

string folder = Path.GetDirectoryName(file);
string fileName = Path.GetFileNameWithoutExtension(file);
string extension = Path.GetExtension(file);

What you now need to do is use a simple loop to iterate and create the new filename.

C#

int fileCounter = 1;
while (File.Exists(file))
{
  file = Path.Combine(folder, $"{fileName}{fileCounter}{extension}");
  fileCounter++;
}

Now that loop will keep going until it finds a unique file name at which point it will finish. As an optimisation, you will probably notice that you can drop the original File.Exists check and leave this entirely down to the while loop.