/// <summary>
/// Read the row data read using repeated ReadRow() calls and build a DataColumnCollection with types and column names
/// </summary>
/// <param name="headerRow">True if the first row contains headers</param>
/// <returns>System.Data.DataTable object populated with the row data</returns>
public DataTable CreateDataTable(bool headerRow)
{
// Read the CSV data into rows
List <List <object> > rows = new List <List <object> >();
List <object> readRow = null;
while ((readRow = ReadRow()) != null)
{
rows.Add(readRow);
}
// The types and names (if headerRow is true) will be stored in these lists
List <Type> columnTypes = new List <Type>();
List <string> columnNames = new List <string>();
// Read the column names from the header row (if there is one)
if (headerRow)
{
foreach (object name in rows[0])
{
columnNames.Add(name.ToString());
}
}
// Read the column types from each row in the list of rows
bool headerRead = false;
foreach (List <object> row in rows)
{
if (headerRead || !headerRow)
{
for (int i = 0; i < row.Count; i++)
{
// If we're adding a new column to the columnTypes list, use its type.
// Otherwise, find the common type between the one that's there and the new row.
if (columnTypes.Count < i + 1)
{
columnTypes.Add(row[i].GetType());
}
else
{
columnTypes[i] = StringConverter.FindCommonType(columnTypes[i], row[i].GetType());
}
}
}
else
{
headerRead = true;
}
}
// Create the table and add the columns
DataTable table = new DataTable();
for (int i = 0; i < columnTypes.Count; i++)
{
table.Columns.Add();
table.Columns[i].DataType = columnTypes[i];
if (i < columnNames.Count)
{
table.Columns[i].ColumnName = columnNames[i];
}
}
// Add the data from the rows
headerRead = false;
foreach (List <object> row in rows)
{
if (headerRead || !headerRow)
{
DataRow dataRow = table.NewRow();
for (int i = 0; i < row.Count; i++)
{
dataRow[i] = row[i];
}
table.Rows.Add(dataRow);
}
else
{
headerRead = true;
}
}
return(table);
}
/// <summary>
/// Read the next object from the currentLine string
/// </summary>
/// <returns>The next object in the currentLine string</returns>
private object ReadNextObject()
{
if (currentLine == null)
{
return(null);
}
// Check to see if the next value is quoted
bool quoted = false;
if (currentLine.StartsWith("\""))
{
quoted = true;
}
// Find the end of the next value
string nextObjectString = "";
int i = 0;
int len = currentLine.Length;
bool foundEnd = false;
while (!foundEnd && i <= len)
{
// Check if we've hit the end of the string
if ((!quoted && i == len) || // non-quoted strings end with a comma or end of line
(!quoted && currentLine.Substring(i, 1) == FieldSep)
// quoted strings end with a quote followed by a comma or end of line
|| (quoted && i == len - 1 && currentLine.EndsWith("\"")) ||
(quoted && currentLine.Substring(i, 2) == "\"" + FieldSep))
{
foundEnd = true;
}
else
{
i++;
}
}
if (quoted)
{
if (i > len || !currentLine.Substring(i, 1).StartsWith("\""))
{
throw new FormatException("Invalid CSV format: " + currentLine.Substring(0, i));
}
i++;
}
nextObjectString = currentLine.Substring(0, i).Replace("\"\"", "\"");
if (i < len)
{
currentLine = currentLine.Substring(i + 1);
}
else
{
currentLine = "";
}
if (quoted)
{
if (nextObjectString.StartsWith("\""))
{
nextObjectString = nextObjectString.Substring(1);
}
if (nextObjectString.EndsWith("\""))
{
nextObjectString = nextObjectString.Substring(0, nextObjectString.Length - 1);
}
return(nextObjectString);
}
else
{
object convertedValue;
StringConverter.ConvertString(nextObjectString, out convertedValue);
return(convertedValue);
}
}
