How to delete a file marked with the "Read only" attribute?

Question

I am trying to delete a file that is marked with the attribute "Read only":

Whenever the file is marked with the said attribute, I get the following exception:

System.Unauthorizedaccessexception was unhandled

If it is a file whose "Read only" attribute is unchecked, the deletion process is performed smoothly.

How do I remove files marked with this attribute?

Answer 1

System.IO.File

File.SetAttributes(caminhoDoArquivo, ~FileAttributes.ReadOnly);
File.Delete(caminhoDoArquivo);

System.IO.Fileinfo (via property)

fileInfo.IsReadOnly = false;
fileInfo.Delete();

System.IO.Fileinfo (via attribute)

fileInfo.Attributes &= ~FileAttributes.ReadOnly;
fileInfo.Delete();

Answer 2

To remove read-only you need to remove this attribute. For this you can use the class FileInfo.

var info = new FileInfo("teste.txt");

And access the property Attributes that is Enum with flags (read more). With this you can remove the attribute ReadOnly and your file can be deleted.

new FileInfo("test.txt").Attributes &= ~FileAttributes.ReadOnly;

Answer 3

Add this Assembly:

using System.IO;

Add this line AFTER declaring the directory:

File.SetAttributes(path, File.GetAttributes(path) | FileAttributes.Hidden);
//path = Diretório

.Hidden = Estate.

Example:

• .Normal, for normal.
• .Readonly, for read-only.
• .Archive for backup, etc...

More info: http://msdn.microsoft.com/en-us/library/system.io.file.setattributes(v=vs.110). aspx