Is there a way to check if a file is in use/opened

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iam try to check that the file is in use or not in c#
i want to check the simple text file

What I have tried:

C#

public static bool IsFileLocked(string filePath) 
        {
            bool lockStatus = false;
            try
            {
                using (FileStream fileStream = File.Open(filePath, FileMode.Open, FileAccess.ReadWrite, FileShare.None)) 
                {
                    // File/Stream manipulating code here

                    lockStatus = !fileStream.CanWrite;
                    
                }
            }
            catch
            {
                //check here why it failed and ask user to retry if the file is in use.
                lockStatus = true;
            }
            return lockStatus;
        }

Posted 29-Apr-16 0:53am

srilekhamenon

Updated 29-Apr-16 1:20am

Santosh Kokatnur

v2

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Santosh Kokatnur · Answer 1 · 2016-04-29T01:11:00

C#

try
{
using(FileStream fs = File.OpenWrite(strFileName)
{
if(fs == null)
return;
}
}
catch(UnauthorizedAccessException e)
{
//Here you know that the file is open by another app
}

or Else, Try this!!!

C#

public bool FileIsLocked(string strFullFileName) {
        bool blnReturn = false;
        System.IO.FileStream fs;
        try {
            fs = System.IO.File.Open(strFullFileName, IO.FileMode.OpenOrCreate, IO.FileAccess.Read, IO.FileShare.None);
            fs.Close();
        }
        catch (System.IO.IOException ex) {
            blnReturn = true;
        }
        return blnReturn;
    }

Santosh Kokatnur · Answer 2 · 2016-04-29T01:01:00

Solution 1

Try this!

C#

protected virtual bool IsFileLocked(FileInfo file)
{
    FileStream stream = null;

    try
    {
        stream = file.Open(FileMode.Open, FileAccess.Read, FileShare.None);
    }
    catch (IOException)
    {
        //the file is unavailable because it is:
        //still being written to
        //or being processed by another thread
        //or does not exist (has already been processed)
        return true;
    }
    finally
    {
        if (stream != null)
            stream.Close();
    }

    //file is not locked
    return false;
}

Posted 29-Apr-16 1:01am

Santosh Kokatnur

Comments

srilekhamenon 29-Apr-16 7:04am

this is not working in case of simple text file

Santosh Kokatnur 29-Apr-16 7:08am

What you want to achieve , Clear it first!

srilekhamenon 29-Apr-16 7:12am

iam try to move files from one directory to other. if any of the files in the directory is opened by user it will not move properly
so iam checking each files in the directory wheather it is opened or not looping all the files in directory

Santosh Kokatnur 29-Apr-16 7:15am

Dear, Go through my Second solution!

Philippe Mori 29-Apr-16 21:34pm

State can change between the time you check and the time you move a file so it might be preferable to display a message asking the user what to do...