How can I get past the following error: System.IO.IOException: 'The directory name is invalid. in my foreach loop?

Question

I am trying to check if a CSV file exists and then save it to a MySQL table

Here is the code I have

    public void SaveCsvToDatabase(string strDirectory)
    {
        if (strDirectory.Length > 0)
        {
            if (ConnectToDatabase())
            {
                //And specify the name of the file in the path we want. 
                DirectoryInfo diFileCheck = new DirectoryInfo(strDirectory);
                foreach (var fi in diFileCheck.GetFiles())
                {
                    string strSourceFile = fi.FullName;
                    if (File.Exists(strSourceFile))
                    {
                        //save our file to the database
                        string strFileInsert = "INSERT INTO InvoiceHdr" +
                                               " (fileName) VALUES ('" + MySqlHelper.EscapeString(strSourceFile) + "')";

                        MySqlCommand command = new MySqlCommand(strFileInsert, con);
                        if (command.ExecuteNonQuery() == 1)
                        {
                            //we've inserted our row, now get the new id
                            m_iFileId = command.LastInsertedId;
                            if (m_iFileId != 0)
                            {
                                SaveCsvLines(strSourceFile);
                            }
                            ArchiveFile();
                        }
                    }
                    else
                    {
                        string strMessage = "No file found in directory: \n\n" + strDirectory;
                        MessageBox.Show(strMessage, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                }
            }
        }
    }

It's this line that give me the error

foreach (var fi in diFileCheck.GetFiles())

The message says

"The directory name is invalid.\\r\\n"

I've just noticed my diFileCheck gives an error when I step into it:

Answer 1

Ok here's what I've done and seems to act as I want it to

    public void SaveCsvToDatabase(string strDirectory)
    {
        if (ConnectToDatabase())
        {
            //We need to specify file we are looking to process exists.
            int fileCount = Directory.GetFiles(@"\\company\Archive\IN\InvoiceTest\Inbox\").Length;
            //And specify the name of the file in the path we want. 
            DirectoryInfo diFileCheck = new DirectoryInfo(@"\\company\EDIArchive\IN\InvoiceTest\Inbox\");
            foreach (var file in diFileCheck.GetFiles())
            {
                string strSourceFile = file.FullName;
                if (File.Exists(strSourceFile))
                {
                    //save our file to the database
                    string strFileInsert = "INSERT INTO InvoiceHdr" +
                                           " (fileName) VALUES ('" + MySqlHelper.EscapeString(strSourceFile) + "')";

                    MySqlCommand command = new MySqlCommand(strFileInsert, con);
                    if (command.ExecuteNonQuery() == 1)
                    {
                        //we've inserted our row, now get the new id
                        m_iFileId = command.LastInsertedId;
                        if (m_iFileId != 0)
                        {
                            SaveCsvLines(strSourceFile);
                        }

                    ArchiveFile();

                    }
                }
            }
            if (fileCount == 0)
            {
                //If we cant count any files in the specified path, we can display a message box warning us. 
                string strMessage = "No file found in directory: \n\n" + strDirectory;
                MessageBox.Show(strMessage, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
    }

Thanks for all the tips!

Answer 2

Check to see if the directory exists first using DirectoryInfo.Exists .

DirectoryInfo diFileCheck = new DirectoryInfo(strDirectory);
if(!diFileCheck.Exists)
     // do something here, possibly return
foreach (var fi in diFileCheck.GetFiles())
{
    // and so on