/// <summary>
/// Parses CSV file. and returns <seealso cref="CsvReader"/> initialized with the content.
/// </summary>
/// <param name="csvFilePath">
/// The CSV file path.
/// </param>
/// <param name="hasHeader">
/// Indicates if the file has a header.
/// </param>
/// <param name="options">
/// The options.
/// </param>
/// <returns>
/// The <seealso cref="CsvReader"/> initialized with the content of the CSV <paramref name="csvFilePath"/>.
/// </returns>
public static CsvReader Parse(string csvFilePath, bool hasHeader = true, CsvReaderOptions options = null)
{
var stream = File.OpenRead(csvFilePath);
return(new CsvReader()
{
stream = stream,
Rows = Parse(stream, hasHeader, options)
});
}
/// <summary>
/// Initializes a new instance of the <see cref="CsvRow"/> class.
/// </summary>
/// <param name="headers">
/// The headers.
/// </param>
/// <param name="values">
/// The values.
/// </param>
/// <param name="options">
/// The options.
/// </param>
// ReSharper disable once ParameterOnlyUsedForPreconditionCheck.Local
public CsvRow(List <string> headers, List <string> values, CsvReaderOptions options)
{
if (options.StrictCellCount && headers.Count != values.Count)
{
throw new CsvInvalidCellCountException(headers.Count, values.Count);
}
for (int i = 0; i < headers.Count; i++)
{
string header = headers[i];
this.values.Add(header, values.Count > i ? values[i] : string.Empty);
}
}
/// <summary>
/// Parse CSV file to list of dynamic objects.
/// </summary>
/// <param name="input">
/// The input CSV stream.
/// </param>
/// <param name="hasHeader">
/// Indicates if the file has a header.
/// </param>
/// <param name="options">
/// The options.
/// </param>
/// <returns>
/// The list of dynamic objects produced from CSV lines.
/// </returns>
public static IEnumerable <dynamic> Parse(Stream input, bool hasHeader = true, CsvReaderOptions options = null)
{
if (options == null)
{
options = new CsvReaderOptions();
}
using (TextReader reader = new StreamReader(input))
{
char separator = options.Separator;
List <string> headers = new List <string>();
if (hasHeader)
{
HashSet <string> duplicateHeaderTracker = new HashSet <string>();
var headerRowComponents = CsvParser.ParseLine(reader, options.Separator).ToList();
if (!headerRowComponents.Any())
{
yield break;
}
for (int i = 0; i < headerRowComponents.Count; i++)
{
string currentHeader = TransformHeaderNameToPropertyName(headerRowComponents[i], options.HeaderMatchRegex ?? MatchSurroundingQuotes);
currentHeader = AllowedHeaderNames.IsMatch(currentHeader) ? currentHeader : null;
if (options.ResolveHeaderName != null)
{
var currentHeaderReplacement = options.ResolveHeaderName(
headerRowComponents[i],
currentHeader);
currentHeader = string.IsNullOrEmpty(currentHeaderReplacement)
? currentHeader
: currentHeaderReplacement;
}
if (string.IsNullOrEmpty(currentHeader) || duplicateHeaderTracker.Contains(currentHeader))
{
currentHeader = $"Column{i}";
}
duplicateHeaderTracker.Add(currentHeader);
headers.Add(currentHeader);
}
}
List <string> values = CsvParser.ParseLine(reader, separator).ToList();
while (values.Any())
{
if (!headers.Any())
{
headers = new List <string>();
var headerCount = values.Count;
for (int i = 0; i < headerCount; i++)
{
headers.Add($"Column{i}");
}
}
dynamic lineObject = new CsvRow(headers, values, options);
yield return(lineObject);
values = CsvParser.ParseLine(reader, separator).ToList();
}
}
}
