/// <summary>
/// Writes a single row to a CSV file.
/// </summary>
/// <param name="row">The row to be written</param>
public void WriteRow(ReadWriteCSVFile row)
{
StringBuilder builder = new StringBuilder();
bool firstColumn = true;
foreach (string value in row)
{
// Add separator if this isn't the first value
if (!firstColumn)
{
builder.Append(',');
}
// Implement special handling for values that contain comma or quote
// Enclose in quotes and double up any double quotes
if (value.IndexOfAny(new char[] { '"', ',' }) != -1)
{
builder.AppendFormat("\"{0}\"", value.Replace("\"", "\"\""));
}
else
{
builder.Append(value);
}
firstColumn = false;
}
row.LineText = builder.ToString();
WriteLine(row.LineText);
}
/// <summary>
/// Reads a row of data from a CSV file
/// </summary>
/// <param name="row"></param>
/// <returns></returns>
public bool ReadRow(ReadWriteCSVFile row)
{
row.LineText = ReadLine();
if (String.IsNullOrEmpty(row.LineText))
{
return(false);
}
int pos = 0;
int rows = 0;
while (pos < row.LineText.Length)
{
string value;
// Special handling for quoted field
if (row.LineText[pos] == '"')
{
// Skip initial quote
pos++;
// Parse quoted value
int start = pos;
while (pos < row.LineText.Length)
{
// Test for quote character
if (row.LineText[pos] == '"')
{
// Found one
pos++;
// If two quotes together, keep one
// Otherwise, indicates end of value
if (pos >= row.LineText.Length || row.LineText[pos] != '"')
{
pos--;
break;
}
}
pos++;
}
value = row.LineText.Substring(start, pos - start);
value = value.Replace("\"\"", "\"");
}
else
{
// Parse unquoted value
int start = pos;
while (pos < row.LineText.Length && row.LineText[pos] != ',')
{
pos++;
}
value = row.LineText.Substring(start, pos - start);
}
// Add field to list
if (rows < row.Count)
{
row[rows] = value;
}
else
{
row.Add(value);
}
rows++;
// Eat up to and including next comma
while (pos < row.LineText.Length && row.LineText[pos] != ',')
{
pos++;
}
if (pos < row.LineText.Length)
{
pos++;
}
}
// Delete any unused items
while (row.Count > rows)
{
row.RemoveAt(rows);
}
// Return true if any columns read
return(row.Count > 0);
}