File.Exists() returns false, but not in debug

file.exists returns false c#
file.exists returns false java
c could not find file but file exists

I'm being completely confused here folks,

My code throws an exception because File.Exists() returns false

public override sealed TCargo ReadFile(string fileName)
{
    if (!File.Exists(fileName))
    {
        throw new ArgumentException("Provided file name does not exist", "fileName");
    }

Visual studio breaks at the throw statement, and I immediately check the value of File.Exists(fileName) in the immediate window. It returns true. When I drag the breakpoint back up to the if statement and execute it again, it throws again.

fileName is an absolute path to a file. I'm not creating the file, nor writing to it (it's there all along). If I paste the path into the open dialog in Notepad, it reads the file without problems.

The code is executing in a background worker. It's the only complicating factor I can think of. I am positive the file has not been opened already, either in the worker thread or elsewhere.

What's going on here?


I don't know what's going on, but why do you need the File.Exists test at all? What you're really interested in is, "Can I read this file?" Plenty of other things other than File Not Found can go wrong.

Not to mention, doing a File.Exists test is a race condition because the file could go away after you've done the test, but before you open the file. Just open the file, that's the best test you can do to determine whether you can read the file.

FileInfo.Exists returns false eventhough file exists - MSDN, FileInfo.Exists returns False even if the file exists Pin Exists kept on reporting that the file did not existeven though Assembly. \bin\Debug\ClassLibrary1.dll,​<br /> or one of its dependencies, was not found. UserControl or from another class that may be overriding the Visible property, or the Show() or Hide() methods​? 1. File.Exists returns false if you do not have permission to access the folder or file referenced. It may be that you can see the file in the immediates window as an administrator, but when running in a different context you do not have permission.


File.Exists returns false if you do not have permission to access the folder or file referenced. It may be that you can see the file in the immediates window as an administrator, but when running in a different context you do not have permission.

File.exists(filename) is not working properly my file name contain the , FileExists is returning false on a file that exists on the server. Can you guys submit the FTP logs (see the FAQ on how to log stuff) so we can debug this? Response: 550 SIZE not allowed in ASCII mode # Dispose() Status: Let FileExists and FileExistsAsync cater for 550 - SIZE is not allowed in ASCII #  File.Exists returns false if you do not have permission to access the folder or file referenced. It may be that you can see the file in the immediates window as an administrator, but when running in a different context you do not have permission.


Well, what is the path of your filename? Remember when you build debug and release you compile to different folders. So if you put the file in the debug folder you won't find it when doing a release build.

Re: FileInfo.Exists returns False even if the file exists, or not.The function returns true if the abstract file path exists or else returns false. file.exists(). Parameters: This method does not accept any parameter. It is just that capabilities can be overridden by the usage of filter therefor what you see in the DB do not have to be the value returned by the function (disclaimer, I am not familiar enough with the relevant code paths, so not going to guess what are the chances it might or might not work in default no plugin enviroment) – Mark Kaplun Sep 3 '15 at 15:45


Try to write it in this way:

if (!Server.Map(fileName)) 

FileExists return false when file exists on server · Issue #328 , Project Management · Software Requirements · Software Testing and Debugging There are various ways to check that a file or directory already exists or not. os.path.exists() method in Python is used to check whether the specified path exists or not. This method returns True if path exists otherwise returns False. Find answers to c# : File.Exist can not find a file in the specified folder even that it does exist from the expert community at Experts Exchange


I have faced this problem too. The problem is that you are binding the path directly in function file.exist("complete path manually"). Instead of this you should write server.mappath("yourfolder name where file resides") and then concatenate this with your image.

File exists() method in Java with examples, ELSE # file cannot be opened - assume it does not exist # FALSE AutoHotkey's FileExist() function returns an attribute string (a subset of "RASHNDOCT") if a Else : Debug "result=" +Str(result) +" so this local file is missing" Running the code in debug, I can get the remote directory listing fine, I can loop through it, check the file permissions and dates and so on But immediately after I try to do a simple "FileExists" check passing the first file found and I get false every single time.


Python - Check if a file or directory exists, If the file already exists, the fopen() call will fail by returning FALSE and generating an error of level E_WARNING . If the file does not exist, attempt to create it. Reading the docs on File.Exists return value: true if the caller has the required permissions and path contains the name of an existing file; otherwise, false. This method also returns false if path is a null reference (Nothing in Visual Basic) or a zero-length string.


Check that file exists, After the creating the targetDirectory object, VS shows (in the debug mode) that The account your application is running under probably does not have access File.Exists() always returns false on IIS. The file path that I'm checking with File. This method merely checks if the file specified in path exists, passing an invalid path to exists returns false. I have tested the file.exists function, I can get the right result from the my “c”, I could suggest you create a new project to try it with my code below.


fopen - Manual, The Exists method returns false if any error occurs while trying to determine if the specified file exists. This can occur in situations that raise exceptions such as passing a file name with invalid characters or too many characters, a failing or missing disk, or if the caller does not have permission to read the file.