/// <summary>
/// Convert list of objects of the same type to list of strings.
/// </summary>
/// <param name="items">
/// The items.
/// </param>
/// <param name="options">
/// Options for data serialization.
/// </param>
/// <typeparam name="T">
/// Type of the item in the list.
/// </typeparam>
/// <returns>
/// List of serialized objects.
/// </returns>
private static IEnumerator <string> GetStrings <T>(IEnumerable <T> items, CsvWriterOptions options)
{
Type sourceType = null;
PropertyInfo[] properties = null;
var stringBuilder = new StringBuilder();
foreach (var item in items)
{
if (sourceType == null)
{
sourceType = item.GetType();
properties = sourceType.GetProperties(BindingFlags.Instance | BindingFlags.Public)
.Where(property => property.GetIndexParameters().Length == 0) // exclude indexers
.ToArray();
var headers = properties.Select(property => property.Name);
stringBuilder.Append(string.Join(",", headers));
}
yield return(stringBuilder.ToString());
stringBuilder.Clear();
stringBuilder.Append('\n');
for (int i = 0; i < properties.Length; i++)
{
if (properties[i].PropertyType == typeof(DateTime))
{
var value = (DateTime)properties[i].GetMethod.Invoke(item, null);
var serializedValue = !string.IsNullOrEmpty(options.DateTimeFormat)
? value.ToString(options.DateTimeFormat)
: value.ToString(options.CultureInfo);
stringBuilder.Append(serializedValue);
}
else
{
var toStringMethod = properties[i].PropertyType.GetMethod("ToString", CultureSensitiveToStringParameters);
var value = properties[i].GetMethod.Invoke(item, null);
if (toStringMethod != null)
{
value = toStringMethod.Invoke(value, new object[] { options.CultureInfo });
}
string stringValue = value.ToString();
if (stringValue.IndexOfAny(new[] { ',', '\r', '\n' }) >= 0)
{
stringValue = string.Format("\"{0}\"", stringValue.Replace("\"", "\"\""));
}
stringBuilder.Append(stringValue);
}
if (i < properties.Length - 1)
{
stringBuilder.Append(',');
}
}
}
yield return(stringBuilder.ToString());
}
/// <summary>
/// Converts list of object of the same type to CSV and saves to file.
/// </summary>
/// <param name="items">
/// The items.
/// </param>
/// <param name="csvFilePath">
/// The CSV file path.
/// </param>
/// <param name="options">
/// Options for data serialization.
/// </param>
/// <typeparam name="T">
/// Type of the item in the list.
/// </typeparam>
public static void ToCsvFile <T>(IEnumerable <T> items, string csvFilePath, CsvWriterOptions options = null)
{
using (var stream = ToCsv(items, options))
using (var fileStream = File.Create(csvFilePath))
{
stream.CopyTo(fileStream);
}
}
/// <summary>
/// Convert list of object of the same type to CSV.
/// </summary>
/// <param name="items">
/// The items.
/// </param>
/// <param name="options">
/// Options for data serialization.
/// </param>
/// <typeparam name="T">
/// Type of the item in the list.
/// </typeparam>
/// <returns>
/// Stream that contains the CSV.
/// </returns>
public static Stream ToCsv <T>(IEnumerable <T> items, CsvWriterOptions options = null)
{
if (options == null)
{
options = new CsvWriterOptions();
}
return(new StringListStream(GetStrings(items, options)));
}
