Develop Reference

C# System.IO.File.Exists does not work in Unity

I am trying to locate a file on my computer so I can store my game's login data on that certain file. I have a string that contains the path.
public string path = "C:/Users/DevelopVR/Documents";
//DevelopVR is my username
Then I have this later on:
if (System.IO.File.Exists(path))
{
Debug.Log("Path exists on this computer");
}
else
{
Debug.LogWarning("Path does NOT exist on this computer");
}
I have also tried swapping out this:
else
{
Debug.LogWarning("Path does NOT exist on this computer");
}
With this:
else if (!System.IO.File.Exists(path))
{
Debug.LogWarning("Path does NOT exist on this computer");
}
But every time it logs the error. So I don't know what to do. It seems like other people are having the same problem. Thanks, If you have the answer.

Documents is a Directory, not a File, so instead of checking for File, check for Directory like:
if(File.Exists(path))
{
// This path is a file
ProcessFile(path);
}
else if(Directory.Exists(path))
{
// This path is a directory
ProcessDirectory(path);
}
Remember that if you want to search for a File, your path should have the file name and extension like:
public string path = #"C:/Users/DevelopVR/Documents/MyFile.txt";

"Documents" is not a real path, it's a convenience link to the 'special folder' that Windows provides.
From https://learn.microsoft.com/en-us/dotnet/api/system.environment.specialfolder?view=netcore-3.1
// Sample for the Environment.GetFolderPath method
using System;
class Sample
{
public static void Main()
{
Console.WriteLine();
Console.WriteLine("GetFolderPath: {0}", Environment.GetFolderPath(Environment.SpecialFolder.System));
}
}
/*
This example produces the following results:
GetFolderPath: C:\WINNT\System32
*/

How can I fix this DirectoryNotFoundException?

I have a DirectoryNotFoundException on a .txt file if I use the full path it's working but I don't want to use the full path because I want the program work no matter where it is placed (compatibilty with the maximum of computer)
Here's my code
private void SaveClose_Click(object sender, RoutedEventArgs e)
{
if (Windowed.IsChecked == true)
windowed = true;
else
windowed = false;
string textWriteWindowed;
if (windowed == true)
{
textWriteWindowed = "-screen-fullscreen 0" + Environment.NewLine;
}
else
{
textWriteWindowed = "-screen-fullscreen 1" + Environment.NewLine;
}
var selectedResolution = ResolutionBox.SelectedItem.ToString();
var split = selectedResolution.Split('x');
widthChoose = Int32.Parse(split[0]);
heightChoose = Int32.Parse(split[1]);
string textWriteWidth;
textWriteWidth = "-screen-width " + widthChoose + Environment.NewLine;
string textWriteHeight;
textWriteHeight = "-screen-height " + heightChoose + Environment.NewLine;
File.WriteAllText(#"\Resources\arguments.txt", textWriteWindowed);
File.AppendAllText(#"\Resources\arguments.txt", textWriteWidth);
File.AppendAllText(#"\Resources\arguments.txt", textWriteHeight);
this.Close();
}

The first argument of File.WriteAllText takes a path as input. Whatever you have mentioned is not the absolute path but it is just the relative path of the file. WriteAllText creates the file but doesn't create the directory by itself. So something like:
File.WriteAllText(#"\arguments.txt", textWriteWindowed);
shall work (and create the file in the respective drive), but
File.WriteAllText(#"\Resources\arguments.txt", textWriteWindowed);
shall not work. Hence, if you want to create a file in the path where the application resides, you can do something like:
string folder=Path.GetDirectoryName(Process.GetCurrentProcess().MainModule.FileName);
File.WriteAllText(#"\arguments2.txt", "ABC");
If you want to create a directory, then you could do something like:
System.IO.FileInfo file = new System.IO.FileInfo(filePath);
file.Directory.Create();// If the directory already exists, this method does nothing.
System.IO.File.WriteAllText(file.FullName, textWriteWindowed);
Hope this answers your query.

you have to check whether the folder is exist before save the file,
if folder not exist create it using
Directory.CreateDirectory(...)
Directory.Exists(..)
you can use to check folder existence

IF you wanted to get the local path of the file you are executing use this:
var fInfo = new FileInfo(System.Reflection.Assembly.GetCallingAssembly().Location);
From there, you would do the following:
var parentDir = new DirectoryInfo(fInfo.DirectoryName);
var subDir = new DirectoryInfo(parentDir.FullName + "Resource");
if(!subDir.Exists)
subDir.Create();
This would ensure that you always have a folder in the directory of your executable. But just so you know, this is absolutely horrible code and should never ever be implemented in a production like environment. What if some knucklehead sysAdmin decides to place your program/folder in an area that the current user does not have access/writes too? The best place to write to is %APPDATA%, this will ensure the user always has read/write permissions to what you are trying to accomplish.

I don't know how but doing that worked for me :
File.WriteAllText(#"./arguments.txt", textWriteWindowed);
File.AppendAllText(#"./arguments.txt", textWriteWidth);
File.AppendAllText(#"./arguments.txt", textWriteHeight);

How do I get the folder for the currently open file in c#

I am writing a wizard that pulls information from a database like file. This wizard doesn't get compiled, it just runs on command. I am not sure the correct term for that.
The issue is, I need to enter more information which will manipulate the database, and I want to store the values into a csv file that I use to manipulate the database.
So the question is: How do I get the folder for the currently open file in a c# application so that I can save a csv file to that folder?
edit: The path needs to be dynamic. Each database file is stored in a separate folder. I need the wizard to save to which ever folder I just opened the file from.
edit2 :
I am not opening the file programmatically. The file is being open by the user in the application. So, the user opens a file, and a bunch of database information is displayed. He then runs a wizard on that data where he can enter some coefficients, etc .. and that will change the information in the database file. I need to be able to store the coefficients he enters into the folder that contains the database file that he opened. I cannot access / change the application code, only the wizard code.
Thanks

Something like this?
var file = "C:\\Users\\Me\\Desktop\\Test.txt";
var fileLocation = file.Substring(0, file.LastIndexOf("\\"));

You can use this:
string path = Path.GetFullPath(Directory.GetCurrentDirectory()).TrimEnd(Path.DirectorySeparatorChar);
string directoryName = Path.GetFileName(path);
I found this solution in this thread
Get the (last part of) current directory name in C#

Try
//Or where ever the database returns the file is stored
var filename = "C:\\Temp\\File\\Test.txt";
var path = System.IO.Path.GetDirectoryName(filename);
Should return C:\Temp\File
Source : https://msdn.microsoft.com/en-us/library/system.io.path.getdirectoryname(v=vs.110).aspx

Try using DirectoryInfo to get information about any directory:
using System;
using System.IO;
namespace ConsoleApplication2
{
class Program
{
static void Main(string[] args)
{
DirectoryInfo di = new DirectoryInfo(Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location));
if (di != null)
{
FileInfo[] subFiles = di.GetFiles();
if (subFiles.Length > 0)
{
Console.WriteLine("Files:");
foreach (FileInfo subFile in subFiles)
{
Console.WriteLine(" " + subFile.Name + " (" + subFile.Length + " bytes) " + "Directory name: "
+ di.Name + " Directory full name: " + di.FullName);
}
}
Console.ReadKey();
}
}
}
}

File not relocating correctly c#

I have my program setup to rename and store a file according to checkbox input. I used another stackoverflow post for my template. Only problem is when I tried setting it up for sub-folders, it never puts it in the correct folder. I have a label folder with two sub folders called L-Labels and B-Labels. The user checks which label type it is and the file gets renamed and placed in the according sub-folder. When I used breakpoint my variables are getting the correct value so I don't see what's wrong I have provided my variables and code for relocating the file. What is causing this to not put it in my sub-folder?
Varibales:
string oldPath = lblBrowseName.Text;
string newpathB = #"C:\Users\Public\Labels\B_Labels";
string newpathL = #"C:\Users\Public\Labels\L_Labels";
Method:
if (rChkBoxBizerba.Checked == true)
{
string newFileName = rtxtBoxNewVersion.Text;
FileInfo f1 = new FileInfo(oldPath);
if (f1.Exists)
{
if (!Directory.Exists(newpathB))
{
Directory.CreateDirectory(newpathB);
}
f1.CopyTo(string.Format("{0}{1}{2}", newpathB, newFileName, f1.Extension));
if (System.IO.File.Exists(lblBrowseName.Text))
System.IO.File.Delete(lblBrowseName.Text);
}

I would say this is the problem:
f1.CopyTo(string.Format("{0}{1}{2}", newpathB, newFileName, f1.Extension));
You declare your path but it doesn't have a trailing directory separator, so when you combine all the parts, as above, the actual result is invalid.
You really should use Path.Combine() to combine parts of paths together, this uses the correct directory separator and makes additional checks.
Try something like this:
// Build actual filename
string filename = String.Format("{0}{1}",newFileName, f1.Extension));
// Now build the full path (directory + filename)
string full_path = Path.Combine(newpathB,filename);
// Copy file
f1.CopyTo(full_path);

Checking File Path When Deleting A File

If I have a web method that deletes a file when called and it accepts three parameters (cNum, year, and fileName). Do I need to be worried about exploits of this method. The only thing I could think of would be using ..\..\..\ to drive the delete further up the folder structure. that should be pretty easy to remove that. But is there anything else that I should be worried about?
[WebMethod(EnableSession = true,
Description = "Method for deleting files uploaded by customers")]
[ScriptMethod(ResponseFormat = ResponseFormat.Xml)]
public Boolean deleteCustFiles(string cNum, string year, string fileName)
{
try
{
if (String.IsNullOrEmpty(cNum)
|| String.IsNullOrEmpty(year)
|| String.IsNullOrEmpty(fileName))
throw new Exception();
string path = Server.MapPath(#"~\docs\custFiles\"
+ year + #"\"
+ cNum + #"\" + fileName);
File.Delete(path);
}
catch
{
throw new Exception("Unable to delete file");
}
return true;
}

I would recommend using the GetFileName method on the Path class to cleanse the filename parameter, like so:
public Boolean deleteCustFiles(string cNum, string year, string fileName)
{
// Cleanse fileName.
fileName = Path.GetFileName(fileName);
The GetFileName method strips all directory information from a path, which is exactly what you want to do here.
With input like:
..\..\..\filename.ext
You would get:
filename.ext
In return, you don't have to worry about someone injecting a path which would escape the directory that you are targeting (assuming that this filename is user-input or from an open endpoint where someone could enter any input they want).
This then allows you to then append your custom path to fileName.
This only works of course if all of your files are in a pre-defined directory, which it seems it is.
This does not however, do anything to handle deleting files that a user doesn't have access to. If the files belong to another user in that directory, then there's no check here to see if that's the case (but if all users have rights to delete these files, then it's ok).
Also, you might want to use the Combine method on the Path class to combine your paths, like so:
string path = Server.MapPath(#"~\docs\custFiles\")
path = Path.Combine(path, year);
path = Path.Combine(path, cNum);
path = Path.Combine(path, fileName);
If you're using .NET 4.0 or above, you can use the overload of the Combine method that takes the parts of the path as a parameter array:
string path = Path.Combine(
Server.MapPath(#"~\docs\custFiles\"),
year, cNum, fileName);
Finally, as Shai points out, if possible (for a complete solution), to make this even more secure you should be enabling permissions on the file-system level.
If you are impersonating the user or using a constrained user account to handle all of the requests, then you should grant that user access to just the ~\docs\custFiles\ directory (and any sub directories).
Anything above that directory the user account should have no access to.

It is a good idea to check the file names and directory names if they are valid file names or not, check them against this char array:
Path.GetInvalidFileNameChars
EDIT:
And you should probably also validate the year and number like this:
bool valid = int.TryParse(num, out temp);

You may also want to consider using built in security on the file system to prevent users from deleting files in unwanted directories. If the web app is running under a specific user that has rights to delete files in only one directory, no matter what the user tries, the app will not have the rights to perform the delete.
In addition, this would make maintenance (ie: adding new directories) pretty easy without redeploying the app.
You could then catch the attempt to access the invalid access attempt and do something with it if you so desire.
[WebMethod(EnableSession = true,
Description = "Method for deleting files uploaded by customers")]
[ScriptMethod(ResponseFormat = ResponseFormat.Xml)]
public Boolean deleteCustFiles(string cNum, string year, string fileName)
{
try
{
if (String.IsNullOrEmpty(cNum) || String.IsNullOrEmpty(year) ||
String.IsNullOrEmpty(fileName))
throw new Exception();
string path =
Server.MapPath(#"~\docs\custFiles\" + year + #"\" + cNum +
#"\" + fileName);
File.Delete(path);
}
catch (System.Security.SecurityException e)
{
throw new Exception("Unauthorized attempt to delete file");
}
catch
{
throw new Exception("Unable to delete file");
}
return true;
}