/// <summary>
/// Provide a hook to preprocess a record
/// </summary>
/// <param name="e">Record details before read</param>
/// <returns>True if record to be skipped</returns>
protected bool OnBeforeReadRecord(Events.BeforeReadEventArgs <T> e)
{
if (RecordInfo.NotifyRead)
{
((INotifyRead)e.Record).BeforeRead(e);
}
BeforeReadRecord?.Invoke(this, e);
return(e.SkipThisRecord);
}
private IList ReadStreamAsList(TextReader reader, int maxRecords, DataTable dt)
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader), "The reader of the Stream can´t be null");
}
HeaderText = string.Empty;
FooterText = string.Empty;
IList result;
using (var recordReader = new TextReaderWrapper(reader))
{
ResetFields();
if (_objectEngine)
{
result = new ArrayList();
}
else
{
result = new List <T>();
}
var currentRecord = 0;
var streamInfo = new StreamInfoProvider(reader);
using (var freader = new ForwardReader(recordReader, RecordInfo.IgnoreLast))
{
freader.DiscardForward = true;
string currentLine, completeLine;
LineNumber = 1;
completeLine = freader.ReadNextLine();
currentLine = completeLine;
if (MustNotifyProgress) // Avoid object creation
{
OnProgress(new ProgressEventArgs(0, -1, streamInfo.Position, streamInfo.TotalBytes));
}
if (RecordInfo.IgnoreFirst > 0)
{
for (var i = 0; i < RecordInfo.IgnoreFirst && currentLine != null; i++)
{
HeaderText += currentLine + Environment.NewLine;
currentLine = freader.ReadNextLine();
LineNumber++;
}
}
var byPass = false;
if (maxRecords < 0)
{
maxRecords = int.MaxValue;
}
var line = new LineInfo(currentLine)
{
mReader = freader
};
var values = new object[RecordInfo.FieldCount];
while (currentLine != null &&
currentRecord < maxRecords)
{
completeLine = currentLine;
try
{
TotalRecords++;
currentRecord++;
line.ReLoad(currentLine);
var skip = false;
var record = (T)RecordInfo.Operations.CreateRecordHandler();
if (MustNotifyProgress) // Avoid object creation
{
OnProgress(new ProgressEventArgs(currentRecord,
-1,
streamInfo.Position,
streamInfo.TotalBytes));
}
Events.BeforeReadEventArgs <T> e = null;
if (MustNotifyRead)
{
e = new BeforeReadEventArgs <T>(this, record, currentLine, LineNumber);
skip = OnBeforeReadRecord(e);
if (e.RecordLineChanged)
{
line.ReLoad(e.RecordLine);
}
}
if (skip == false)
{
if (RecordInfo.Operations.StringToRecord(record, line, values))
{
if (MustNotifyRead) // Avoid object creation
{
skip = OnAfterReadRecord(currentLine, record, e.RecordLineChanged, LineNumber);
}
if (skip == false)
{
if (dt == null)
{
result.Add(record);
}
else
{
dt.Rows.Add(RecordInfo.Operations.RecordToValues(record));
}
}
}
}
}
catch (Exception ex)
{
switch (ErrorManager.ErrorMode)
{
case ErrorMode.ThrowException:
byPass = true;
throw;
case ErrorMode.IgnoreAndContinue:
break;
case ErrorMode.SaveAndContinue:
var err = new ErrorInfo
{
LineNumber = freader.LineNumber,
ExceptionInfo = ex,
Text = completeLine
};
ErrorManager.AddError(err);
break;
}
}
finally
{
if (byPass == false)
{
currentLine = freader.ReadNextLine();
LineNumber++;
}
}
}
if (RecordInfo.IgnoreLast > 0)
{
FooterText = freader.RemainingText;
}
}
}
return(result);
}
