Problem with file stream C#

Question

1.00/5 (1 vote)

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My code here:

C#

string sapath1 = Path.GetPathRoot(Environment.GetFolderPath(Environment.SpecialFolder.Windows));
            File.SetAttributes(sapath1, FileAttributes.Normal);

            MD5 md5 = MD5.Create();
            StringBuilder sb = new StringBuilder();

            using (FileStream st = new FileStream(sapath1, FileMode.Open, FileAccess.Read, FileShare.Read))// error here
            {
                foreach (byte b in md5.ComputeHash(st))
                    sb.Append(b.ToString("x2").ToLower());
            }

            label1.Text =  sb.ToString();

I got error: System.UnauthorizedAccessException: 'Access to the path 'C:\' is denied.'

What I have tried:

Help me please. Is there any solution for this?

Posted 19-Jul-19 20:19pm

Lê Hiển Vinh

Updated 19-Jul-19 23:57pm

Patrice T

v3

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3 solutions

Solution 3

Debug your project: you will find out that sapath1 does not hold the path to a file, but to a root drive (most probably c:\).
I think you forgot to reference an actual file; you cannot open a stream on a directory, let alone a root drive.

Posted 19-Jul-19 20:53pm

phil.o

Comments

BillWoodruff 20-Jul-19 4:58am

+5 You nailed it.

phil.o 20-Jul-19 6:10am

Thanks :)

Solution 1

No. "Access denied" means exactly what it says - the user that your app is running under does not have access to the file or folder that you are trying to open.

Move the file to a more publicly accessible folder, or change the user. You can't "work around" this problem.

Posted 19-Jul-19 20:25pm

OriginalGriff

v2

Comments

BillWoodruff 20-Jul-19 6:02am

The error here is the result of calling 'File.SetAttributes on a Drive or Directory.

Lê Hiển Vinh 20-Jul-19 7:04am

How to get md5 of all files in folder c#?

OriginalGriff 20-Jul-19 7:10am

Read the folder files list: Directory.GetFiles will do it.
Read each file and calculate the MD5. Be aware that GetFiles will return hidden files which you can't read and need to skip.

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Patrice T · Accepted Answer · 2019-07-19T20:34:00

Solution 2

Quote:
Is there any solution for this?

Yes don't try to work directly on root of volume C. Windows restrict its usage because it is dangerous.
Work on a sub directory. C:\MyWorkingDir\

Posted 19-Jul-19 20:34pm

Patrice T

Updated 19-Jul-19 20:35pm

v2

Comments

BillWoodruff 20-Jul-19 4:59am

My vote of #2: You can't set FileAttributes on any Directory: only on a File.

Patrice T 20-Jul-19 6:05am

Hi Bill,
The error is on file creation, and I know that windows actively prevent it on system volume root for normal apps.
'You can't set FileAttributes on any Directory: only on a File.'
As a matter of fact, in past, I have used file attributes on directories to hide them.

Patrice T 20-Jul-19 6:07am

Just seen it, but it look that the OP found my answer useful. :)
May be it is not so bad.

BillWoodruff 20-Jul-19 6:23am

You are incorrect: calling 'File.SetAttribute on any Directory path will result in:

System.UnauthorizedAccessException

There is another mechanism for setting Directory Attributes: use the 'Attributes Property of the Directory's 'DirectoryInfo.

Patrice T 20-Jul-19 6:38am

I was doing it in the savage world of MS-DOS :)

BillWoodruff 20-Jul-19 7:21am

Knowing you occasionally make a mistake, I feel less insecure :)

Patrice T 20-Jul-19 7:24am

I do more than occasionally, that is the reason I recommend debugger so often :)

Faiz'S Anwar 29-Aug-23 7:33am

System.UnauthorizedAccessException: Access to the path 'C:\Websites\crm.bookeasyjet.com\Admin\Markup\MetaRules_25Aug2023 (2).xlsx' is denied. at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost) at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy) at System.IO.FileStream..ctor(String path, FileMode mode) at System.Web.HttpPostedFile.SaveAs(String filename) at System.Web.UI.WebControls.FileUpload.SaveAs(String filename) at Admin_MetaRules.btnUpload_Click(Object sender, EventArgs e) in c:\Websites\crm.bookeasyjet.com\Admin\MetaRules.aspx.cs:line 381

when I uploading excel file on live server it's showing this error and when i upload my local server it
is uploaded succesfully how can I solve this error please Give me some advice....Thank you

Patrice T 29-Aug-23 8:29am

You should ask the question there: https://www.codeproject.com/Questions/ask.aspx[^]