how can i know file is already open or in use?

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Is there a way to check if a file is in use?
Check if a file is open

how can i know file is already open or in use.

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

I find above code it is not working properly

http://stackoverflow.com/questions/1304/how-to-check-for-file-lock-in-c — vulkanino, Feb 14 '12 at 13:14
Note that the information you get using a function like that, can be obsolete the moment you use it. The file can be locked, the instance you checked that it wasn't and vice versa. Usually it is best to try whatever you need to do with the file, and react to errors when they occur. — Christian.K, Feb 14 '12 at 13:18
dup of a dup? http://stackoverflow.com/questions/3162957/determine-if-a-file-is-open — kenny, Feb 14 '12 at 13:26

score 0 · Answer 1 · edited May 23 '17 at 12:06

As taken from here: Is there a way to check if a file is in use?

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

        try
        {
            stream = file.Open(FileMode.Open, FileAccess.ReadWrite, 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;
    }

score 0 · Answer 2 · edited May 23 '17 at 11:51

I Already answers before over here : Check if a file is open

Edit

FileInfo file = new FileInfo(path);

Function

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

     try
     {
         stream = file.Open(FileMode.Open, FileAccess.ReadWrite, 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();
     }
     return false; 
}

@bkac - buts working for me check the file path is same and data is there for you.... — Pranay Rana, Feb 14 '12 at 14:38

score 0 · Answer 3 · answered Feb 14 '12 at 13:16

0

Try catching UnauthorizedAccessException as per http://msdn.microsoft.com/en-us/library/b9skfh7s.aspx

UnauthorizedAccessException doesn't inherit from IOException http://msdn.microsoft.com/en-us/library/system.unauthorizedaccessexception.aspx

answered Feb 14 '12 at 13:16

Oliver

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how can i know file is already open or in use?

3 Answers3

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