private static void ReadCsvAsStrings(TextReader reader, out NamedList <string>[] columns, out DataAdaptor[] headers) { Debug.Assert(reader != null); // Get the column names from the first line. string firstline = reader.ReadLine(); if (firstline == null) { columns = null; headers = null; return; } List <string> names = CsvHelper.ReadCells(firstline); int count = names.Count; // Put the columns into lists of strings, and as we do so, maintain the collection of // types it can be parsed into, and whether any entries are null. columns = new NamedList <string> [names.Count]; headers = new DataAdaptor[names.Count]; for (int columnIndex = 0; columnIndex < columns.Length; columnIndex++) { columns[columnIndex] = new NamedList <string>(names[columnIndex]); headers[columnIndex] = new DataAdaptor(); } while (true) { string line = reader.ReadLine(); if (line == null) { break; } List <string> cells = CsvHelper.ReadCells(line); if (cells.Count != count) { throw new FormatException(); } for (int columnIndex = 0; columnIndex < count; columnIndex++) { string cell = cells[columnIndex]; if (String.IsNullOrEmpty(cell)) { headers[columnIndex].IsNullable = true; columns[columnIndex].Add(null); } else { DataAdaptor header = headers[columnIndex]; header.TryParse(cell); columns[columnIndex].Add(cell); } } } }
// CSV output method /// <summary> /// Write the data in the view to a comma-seperated-value file. /// </summary> /// <param name="writer">A writer to accept the data.</param> public void WriteCsv(TextWriter writer) { if (writer == null) { throw new ArgumentNullException(nameof(writer)); } string[] columnNames = new string[this.columns.Count]; for (int c = 0; c < columns.Count; c++) { columnNames[c] = columns[c].Name; } writer.WriteLine(CsvHelper.WriteCells(columnNames)); foreach (DataRow row in this.Rows) { writer.WriteLine(CsvHelper.WriteCells(row)); } }
private static void ReadCsvAsStrings(TextReader reader, out DataList <string>[] columns, out DataAdaptor[] headers) { if (reader == null) { throw new ArgumentNullException(nameof(reader)); } string firstline = reader.ReadLine(); if (firstline == null) { columns = null; headers = null; return; } List <string> names = CsvHelper.ReadCells(firstline); int count = names.Count; columns = new DataList <string> [names.Count]; headers = new DataAdaptor[names.Count]; for (int columnIndex = 0; columnIndex < columns.Length; columnIndex++) { columns[columnIndex] = new DataList <string>(names[columnIndex]); headers[columnIndex] = new DataAdaptor(); } while (true) { string line = reader.ReadLine(); if (line == null) { break; } List <string> cells = CsvHelper.ReadCells(line); if (cells.Count != count) { throw new FormatException(); } for (int columnIndex = 0; columnIndex < count; columnIndex++) { string cell = cells[columnIndex]; if (String.IsNullOrEmpty(cell)) { headers[columnIndex].IsNullable = true; columns[columnIndex].Add(null); } else { DataAdaptor header = headers[columnIndex]; LinkedListNode <TypeAdaptor> adaptorNode = header.TypeCandidates.First; while (adaptorNode != null) { if (!adaptorNode.Value.IsParsable(cell)) { header.TypeCandidates.Remove(adaptorNode); } adaptorNode = adaptorNode.Next; } columns[columnIndex].Add(cell); } } } }