NoSaidTheCompiler NoSaidTheCompiler - 3 days ago 5
C# Question

System.UnauthorizedAccessException while creating a file

I was trying to write a code so that I could log the error messages. I am trying to name the file with the date and would like to create a new log file for each day. After going through a little look around, I came with the following code...

class ErrorLog
{
public void WriteErrorToFile(string error)
{
//http://msdn.microsoft.com/en-us/library/aa326721.aspx refer for more info
string fileName = DateTime.Now.ToString("dd-MM-yy", DateTimeFormatInfo.InvariantInfo);

//@ symbol helps to ignore that escape sequence thing
string filePath = @"c:\users\MyName\mydocuments\visual studio 2012\projects\training\" +
@"discussionboard\ErrorLog\" + fileName + ".txt";

if (File.Exists(filePath))
{
// File.SetAttributes(filePath, FileAttributes.Normal);
File.WriteAllText(filePath, error);
}
else
{
Directory.CreateDirectory(filePath);
// File.SetAttributes(filePath, FileAttributes.Normal)
//Throws unauthorized access exception
RemoveReadOnlyAccess(filePath);
File.WriteAllText(filePath, error);
}
}

public static void RemoveReadOnlyAccess(string pathToFile)
{
FileInfo myFileInfo = new FileInfo(pathToFile);
myFileInfo.IsReadOnly = false;
myFileInfo.Refresh();
}

/*Exception thrown:
* UnAuthorizedAccessException was unhandled.
* Access to the path 'c:\users\anish\mydocuments\visual studio 2012\
* projects\training\discussionboard\ErrorLog\04\12\2013.txt' is denied.
*/
}


I found a forum that has discussed about a similar problem but using
File.SetAttrributes(filePath, FileAttributes.Normal) did not help neither did the RemoveReadOnlyAccess (included in the code above). When I check the properties of the folder, it has read only marked but even when I tick that off it comes back again. I checked the permissions on the folder and except for the special permission, which I was not able to change, everything is allowed.
Any suggestion on how I should proceed would be appreciated.
Why is access to the path denied? the link discusses about a similar problem, but I wasn't able to get my thing working with suggestions listed there.

Thanks for taking time to look at this.

Answer

Your path is strange : "My documents" directory must be "C:\Users\MyName\Documents\"

You can use Environment in order to correct it easily :

String myDocumentPath = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);

Note that it will acces to "My documents" folder of the user that running your exe.

Second error, CreateDirectory must have a path in argument, not a file. using like you do will create a sub-directory with the file name. So you can't create a file with this name !

Try this :

String fileName = DateTime.Now.ToString("d", DateTimeFormatInfo.InvariantInfo);

String filePath = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments)
    + @"\visual studio 2012\projects\training\discussionboard\ErrorLog\";
String fileFullName = filePath + fileName + ".txt";

    if (File.Exists(fileFullName ))
    {
        File.WriteAllText(fileFullName , error);
    }
    else
    {
        Directory.CreateDirectory(filePath);

[...]
    }
}
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