/// <summary>
/// Prepares to convert a delimited file to CSV and notifies the user of progress through the status display.
/// </summary>
/// <param name="file">The full path of the delimited file to be converted.</param>
/// <param name="delimiter">The delimiting character used in the delimited file.</param>
/// <returns>True if no errors were encountered, false otherwise.</returns>
private bool BeginDelimitedToCsvConversion(List <string> files, char delimiter, string qualifier = "")
{
bool noErrors = true;
string currentTime = DateTime.Now.ToString();
foreach (string file in files)
{
// Print current activity in the status display
string msg = $"{Environment.NewLine}Converting {Path.GetFileName(file)} ...";
string tooltip = $"Started {DateTime.Now.ToString()}";
Dispatcher.Invoke(() => WriteToStatusDisplay(msg, tooltip, Brushes.DarkOrange), DispatcherPriority.Background);
// Construct output file path and output a CSV file to the path
string fullOutputPath = $"{_outputDirectory}\\{Path.GetFileNameWithoutExtension(file)}.csv";
var error = CsvConverter.WriteCsvRowsToFile(delimiter, file, fullOutputPath, qualifier);
if (error != null) // errors encountered during operation
{
noErrors = false;
File.Delete(fullOutputPath); // delete the incomplete CSV file
msg = " Error!";
tooltip = $"Error on line {error.LineNumber}: {error.Message}";
Dispatcher.Invoke(() => WriteErrorToStatusDisplay(msg, tooltip), DispatcherPriority.Background);
}
else // no errors detected
{
msg = " Done!";
tooltip = $"This file was successfully processed at {DateTime.Now.ToString("T")}";
Dispatcher.Invoke(() => WriteToStatusDisplay(msg, tooltip, Brushes.Green), DispatcherPriority.Background);
}
}
return(noErrors);
}
/// <summary>
/// Prepares to convert a fixed length file to CSV and notifies the user of progress through the status display.
/// </summary>
/// <param name="file">The full path of the file to be converted.</param>
/// <returns>True if no errors were encountered. False otherwise.</returns>
private async Task <bool> BeginFixedLengthToCsvConversionAsync(List <string> files, string qualifier = "")
{
bool noErrors = false;
// Get the field count and field lengths from user input
int numFields = tbFieldLengths.Text.Split(',').Length; // Number of field lengths entered in tbFieldLengths
string[] fieldWidthsAsStrings = tbFieldLengths.Text.Split(',');
int[] fieldWidths = Array.ConvertAll(fieldWidthsAsStrings, int.Parse);
string currentTime = DateTime.Now.ToString();
foreach (string file in files)
{
// Print current activity in the status display
string msg = $"{Environment.NewLine}Converting {Path.GetFileName(file)} ...";
string tooltip = $"Started {DateTime.Now.ToString()}";
WriteToStatusDisplay(msg, tooltip, Brushes.DarkOrange);
// Construct output file path
string fullOutputPath = $"{OutputDirectory}\\{Path.GetFileNameWithoutExtension(file)}.csv";
// Start writing CSV rows to the file
long resultCode = await Task.Run(() => CsvConverter.WriteCsvRowsToFile(fieldWidths, file, fullOutputPath, qualifier));
if (resultCode != 0) // Error converting file to CSV. At present, only a MalformedLineException will cause this.
{
noErrors = true;
string errorMsg = $"{Environment.NewLine} Error converting {file}: {Environment.NewLine} Line {resultCode} cannot be parsed with the given field lengths.";
string tooltipText = "Check that the field lengths you specified are correct for this file. Note that all selected files must have the same field lengths.";
WriteErrorToStatusDisplay(errorMsg, tooltipText);
}
else
{
WriteToStatusDisplay(" Done!", "This file was successfully processed.", Brushes.Green);
}
}
return(noErrors);
}
/// <summary>
/// TO DO: IMPROVE STATUS OUTPUT!!!
/// Prepares to convert an Excel file to CSV and notifies the user of progress through the status display.
/// </summary>
/// <param name="files">The full path of the file to be converted.</param>
/// <param name="excelFileType">The type of excel file type. Value should be either ".xls" or ".xlsx".</param>
/// <returns>True if no errors were encountered, false otherwise.</returns>
private async Task <bool> BeginExcelToCsvConversionAsync(List <string> files, string excelFileType, string qualifier = "")
{
bool noErrors = true; // false if any exceptions were caught
foreach (string file in files)
{
// Print current activity in status display
string msg = $"{Environment.NewLine}Converting {Path.GetFileName(file)} ...";
string tooltip = "Started " + DateTime.Now.ToString();
WriteToStatusDisplay(msg, tooltip, Brushes.DarkOrange);
// Form connection string for the Excel file
string connectionString = null;
switch (excelFileType.ToLower())
{
case ".xls":
connectionString = String.Format(@"Provider=Microsoft.ACE.OLEDB.16.0;
Data Source={0}; OLE DB Services=-1;
Extended Properties='Excel 8.0; HDR=Yes;'"
, file);
// HDR=Yes indicates that the first row contains column names, not data
break;
case ".xlsx":
connectionString = String.Format(@"Provider=Microsoft.ACE.OLEDB.16.0;
Data Source={0}; OLE DB Services=-1;
Extended Properties='Excel 12.0 Xml; HDR=YES; IMEX=1;'"
// IMEX=1 treats all data as text
, file);
break;
default:
string errorMsg = "Fatal error: An Excel radio button was expected from parameter \"excelFileType\" in ConvertExcelFilesToCsv() but " +
"not received. Please contact the developer.";
string caption = "Fatal error in ConvertExcelFilesToCsv()";
MessageBox.Show(errorMsg, caption);
break;
}
// Create new OleDB connection
using (OleDbConnection connection = new OleDbConnection(connectionString))
{
try
{
// Open the OleDB connection to the Excel sheet and execute query
await Task.Run(() => connection.Open());
string queryString = "SELECT * FROM [Sheet1$]";
OleDbCommand command = new OleDbCommand(queryString, connection);
string currentTime = DateTime.Now.ToString();
// Construct the output file path and begin writing CSV rows to that file
string fullOutputPath = OutputDirectory + @"\" + Path.GetFileNameWithoutExtension(file) + ".csv";
CsvConverter.WriteCsvRowsToFile(command, fullOutputPath, qualifier);
}
catch (OleDbException e)
{
noErrors = false;
string errorMsg = $"{Environment.NewLine} Error: " + e.Message;
string tip = "There is a problem with this Excel file. Please refer to the status display.";
WriteErrorToStatusDisplay(errorMsg, tip);
}
WriteToStatusDisplay(" Done!", "This file was successfully processed.", Brushes.Green);
}
}
return(noErrors);
}