Send email attachment c# - empty path

Questions & Answers
1

I’m trying to send a text file via an email in Unity. I’m using a GUI selection grid so the person can pick the file to send.
I can send the email and attach the file but only if I write out the full path as a string (eg. “/C/Users/…”) within the SendEmailF function (see below) rather than calling a variable. If I try to call a variable (which is a string variable with the path) for some reason it doesn’t seem to pass on the information - I get ArgumentException: Path is Empty error when it attempts to attach the file. Any suggestions? Thanks!

void OnGUI(){
            // Make selection grid with a list of files
		selStrings = Directory.GetFiles(pathName, "*.txt");
		selGridInt = GUI.SelectionGrid (new Rect(200,50,400,100), selGridInt, selStrings,1)

		uploadFile = selStrings[selGridInt];     // this is the selected file and path to send
		}
	}

		public void SendEmailF(){

		MailMessage mail = new MailMessage ();    // create email info

		mail.From = new MailAddress ("myemailaddress");
		mail.To.Add ("recipientemailaddress");
		mail.Subject = "Test Email";
		mail.Body = "This is for testing";

             // This only works if I write out the full path instead of calling 'uploadFile'
		System.Net.Mail.Attachment attachment = new System.Net.Mail.Attachment (uploadFile);   
		mail.Attachments.Add (attachment);
 
		SmtpClient smtpServer = new SmtpClient ("smtp.gmail.com");
		smtpServer.Port = 587;
		smtpServer.Credentials = new System.Net.NetworkCredential ("myemailaddress", "password") as ICredentialsByHost;
		smtpServer.EnableSsl = true;
		ServicePointManager.ServerCertificateValidationCallback = delegate(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) {
			return true;
		};
		smtpServer.Send (mail);
	}
2

You just passed the filename to the Attachment constructor, but you have to use the full filename. Otherwise how should the Attachment class know what file you actually ment?

You can use Path.Combine to construct the full path name like this:

void OnGUI()
{
    // [ ... ]
    uploadFile = System.IO.Path.Combine(pathName, selStrings[selGridInt])
}

edit
Just realised that Directory.GetFiles should already return the full path of the files. What does “pathName” contains? Is it the full path to a directory? Or is it a relative path? You need to use an absolute path.