/// <summary>
/// Create and set up a csv reader based on the data item definition given
/// </summary>
/// <param name="textReader">The text reader to inject in to the CSV reader</param>
/// <param name="definition">The definition of the file</param>
/// <returns>The newly configured CSV Reader</returns>
private static CsvReader SetupReader(TextReader textReader, DataConnection connection, DataItemDefinition definition)
{
// Produce a new CSV Reader
CsvReader result = new CsvReader(textReader);
// Create a helper to read the property bag items
PropertyBagHelper propertyBagHelper = new PropertyBagHelper(connection);
// Configure the CSV Reader
result.Configuration.HasHeaderRecord = (definition == null) ? true :
propertyBagHelper.Get <Boolean>(PropertyBagItemTypeEnum.HasHeaderRecord, true);
result.Configuration.BadDataFound = null; // Don't pipe bad data
result.Configuration.CultureInfo = (definition == null) ?
CultureInfo.CurrentCulture : definition.Culture;
result.Configuration.TrimOptions = TrimOptions.Trim;
result.Configuration.Delimiter = (definition == null) ? "," :
propertyBagHelper.Get <String>(PropertyBagItemTypeEnum.DelimiterCharacter, ",");
result.Configuration.Quote = (definition == null) ? '"' :
propertyBagHelper.Get <Char>(PropertyBagItemTypeEnum.QuoteCharacter, '"');
result.Configuration.IgnoreQuotes = (definition == null) ? true :
propertyBagHelper.Get <Boolean>(PropertyBagItemTypeEnum.IgnoreQuotes, true);
result.Configuration.MissingFieldFound = null;
result.Configuration.ReadingExceptionOccurred = null;
// Send the reader back
return(result);
}
/// <summary>
///
/// </summary>
/// <param name="dataTable"></param>
/// <returns></returns>
public static String DataTableToString(DataItemDefinition definition, DataConnection connection, DataTable dataTable)
{
String result = ""; // New empty string to populate
// Create a helper to read the property bag items
PropertyBagHelper propertyBagHelper = new PropertyBagHelper(connection);
// Get the stream from the file
using (MemoryStream textStream = new MemoryStream())
{
// Set up the writer
StreamWriter streamWriter = new StreamWriter(textStream);
using (CsvWriter writer = SetupWriter(definition, streamWriter))
{
// Do we need to write a header?
if (propertyBagHelper.Get <Boolean>(PropertyBagItemTypeEnum.HasHeaderRecord, false))
{
// Loop the header records and output the header record line manually
definition.ItemProperties
.Where(prop => prop.PropertyType == DataItemPropertyType.Property)
.ToList()
.ForEach(
header =>
{
writer.WriteField(header.Name);
});
// Move to the next line and flush the data
writer.NextRecord();
streamWriter.Flush();
}
// Loop through the actual records and add them to the csv
foreach (DataRow row in dataTable.Rows)
{
// Loop the header records and output the header record line manually
definition.ItemProperties
.Where(prop => prop.PropertyType == DataItemPropertyType.Property)
.ToList()
.ForEach(
property =>
{
writer.WriteField(DataFormatHelper.WriteData(row[property.Name], property, definition), property.Quoted);
});
// Move to the next line and flush the data
writer.NextRecord();
streamWriter.Flush();
}
// Put the data back in the buffer
textStream.Position = 0;
result = ((new StreamReader(textStream)).ReadToEnd() ?? "");
}
}
return(result); // Send the formatted flat file data back
}
/// <summary>
/// Read the raw data file and populate the in-memory data table with it
/// </summary>
/// <param name="rawData">The raw flat file data from wherever it came from</param>
/// <returns>If the translation was successful</returns>
public static DataTable TextToDataTable(DataItemDefinition definition, DataConnection connection, String rawData)
{
// Create a list of data items to return
DataTable dataItems = definition.ToDataTable();
// Create a helper to read the property bag items
PropertyBagHelper propertyBagHelper = new PropertyBagHelper(connection);
// Raw data has something to convert?
if ((rawData ?? "") != "")
{
// Open up a text reader to stream the data to the CSV Reader
using (TextReader textReader = new StringReader(rawData))
{
// Get properties needed to process the file (total lines to skip etc.)
Int32 lineNo = 0;
Int32 linesToSkip =
propertyBagHelper.Get <Int32>(PropertyBagItemTypeEnum.RowsToSkip, 0) +
(propertyBagHelper.Get <Boolean>(PropertyBagItemTypeEnum.HasHeaderRecord, false) ? 1 : 0);
// Loop each line of the file (ignoring lines that do not need to be processed)
String line = "";
while ((line = textReader.ReadLine()) != null)
{
// Is this a line we should be processing
if (lineNo >= linesToSkip)
{
DataRow row = dataItems.NewRow(); // The new row to populate based on the defintion
// Process the row
if (ProcessRow(line, row, definition))
{
dataItems.Rows.Add(row); // Add the row if processing was successful
}
}
lineNo++; // Increment the line number counter
}
}
}
return(dataItems); // Send the datatable back
}
/// <summary>
/// Set up a new csv writer based on the definition given
/// </summary>
/// <param name="definition">The data item definition</param>
/// <returns></returns>
private static CsvWriter SetupWriter(DataItemDefinition definition, TextWriter textWriter)
{
// Create the new writer
CsvWriter writer = new CsvWriter(textWriter);
// Create a helper to read the property bag items
PropertyBagHelper propertyBagHelper = new PropertyBagHelper(definition);
// Force all fields to be quoted or not
writer.Configuration.QuoteAllFields =
propertyBagHelper.Get <Boolean>(PropertyBagItemTypeEnum.QuoteAllFields, false);
return(writer);
}
