The difference between "Network path not found" and "Access denied" in C #

Question

In my C # .NET 2.0 application, I get access to network paths, and I would like to know the difference between paths that do not exist and paths that exist, but for which I do not have permission. I tried to do the following:

try
{
    string[] contents = Directory.GetFileSystemEntries( path );
}
catch( Exception e )
{
    if( e is DirectoryNotFoundException )
        MessageBox.Show( "Path not found" );
    else
        MessageBox.Show( "Access denied" );
}

This works fine for local paths, but for network paths, the exception is always a System.IO.IOException, regardless of the cause of the error. In the "Exception message" field, another message is displayed depending on whether the path exists or not, so that the information is available at some point, but I cannot get to it. Is there a way to distinguish between "path not found" and "access denied" for network paths?

: , , - , henrik peSHIr, :

try
{
    // Issue this call just to find out whether the path exists
    // We don't care about the result

    string[] contents = Directory.GetFileSystemEntries( path );

    // If we get this far then the path exists.
}
catch( IOException e )
{
    uint error = (uint)Marshal.GetHRForException( e );

    if( error == (uint)0x80070041 )     // ERROR_NETWORK_ACCESS_DENIED
    {
        // The poor deluded user doesn't have access rights

        this.SuperProprietaryTechniqueForGettingAccessRights();
    }
    else
    {
        // Hah! The idiot user specified a path that doesn't exist!
        // Chastise them severely, like all good GUI should.

        MessageBox.Show( "NO! BAD USER!" );
    }
}
catch 
{
    // Swallow all other types of exception - we only made the call
    // to find out whether the path exists.
}

Answer 1

Marshal.GetHRForException, , :

if (Marshal.GetHRForException(e) == unchecked((int)0x800704cf)) // ERROR_NETWORK_UNREACHABLE

. WinError.h .

Answer 2

-, catch (Exception), - :

try {
  string[] contents = Directory.GetFileSystemEntries(path);
}
catch(DirectoryNotFoundException)
{
  MessageBox.Show("Path not found");
}
catch(IOException)
{
  MessageBox.Show("Could not access path");
}

: , , , - ?

Answer 3

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, \srv\test1\test2\test3\

"test2" , . , "test1" . , "test3", .

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, .