public Task <Grid> ReadAsync()
{
var data = new List <DataPoint[]>();
var columnCount = -1;
using (var reader = new TextFieldParser(_path, Encoding.Default))
{
reader.TextFieldType = FieldType.Delimited;
reader.SetDelimiters(";");
reader.HasFieldsEnclosedInQuotes = true;
reader.TrimWhiteSpace = true;
try
{
while (!reader.EndOfData)
{
var lineNumber = (int)reader.LineNumber;
var fields = reader.ReadFields();
if (columnCount == -1)
{
columnCount = fields.Length;
}
if (fields.Length != columnCount)
{
throw new ReaderException($"Line {lineNumber} has an invalid number of fields");
}
data.Add(new DataPoint[columnCount]);
for (var index = 0; index < fields.Length; index++)
{
if (!NonNegativeDecimal.TryParse(fields[index], out var value))
{
throw new ReaderException($"Cannot parse value in column {index} of row {lineNumber}");
}
data[lineNumber - 1][index] = new DataPoint(lineNumber, index, value);
}
}
}
catch (MalformedLineException e)
{
throw new ReaderException("A line could not be parsed", e);
}
}
return(Task.FromResult(new Grid(data)));
}
