/// <summary>
/// Loads items from the specified <see cref="StreamReader"/>.
/// </summary>
/// <typeparam name="T">
/// The type of the output items.
/// </typeparam>
/// <param name="r">
/// The input <see cref="StreamReader"/>.
/// </param>
/// <param name="cultureInfo">
/// The input culture.
/// </param>
/// <returns>
/// A list of items.
/// </returns>
/// <exception cref="System.FormatException">
/// Unit not recognized
/// </exception>
public static IList <T> Load <T>(StreamReader r, CultureInfo cultureInfo = null)
{
if (cultureInfo == null)
{
cultureInfo = CultureInfo.InvariantCulture;
}
var separator = cultureInfo.TextInfo.ListSeparator;
var type = typeof(T);
// Get the properties from the type
var properties = type.GetTypeInfo().DeclaredProperties.ToArray();
var header = r.ReadLine();
if (header == null)
{
return(null);
}
// Parse the header
var headers = CsvFile.SplitLine(header, separator[0]);
int n = headers.Length;
var propertyDescriptors = new PropertyInfo[n];
var units = new IQuantity[n];
for (int i = 0; i < n; i++)
{
string name, unit;
CsvFile.SplitHeader(headers[i], out name, out unit);
propertyDescriptors[i] = properties.First(pi => pi.Name == name);
var quantityType = CsvFile.GetQuantityType(propertyDescriptors[i].PropertyType);
// Set the unit if it is a IQuantity based property
if (quantityType != null)
{
IQuantity displayUnit;
if (UnitProvider.Default.TryGetUnit(quantityType, unit, out displayUnit))
{
units[i] = displayUnit;
}
else
{
throw new FormatException("Unit " + unit + " not recognized");
}
}
}
// Read the rows
var items = new List <T>();
int lineNumber = 1;
while (!r.EndOfStream)
{
lineNumber++;
var line = r.ReadLine();
if (line == null)
{
continue;
}
var values = CsvFile.SplitLine(line, separator[0]);
if (values.Length != n)
{
throw new FormatException("Wrong number of columns on line " + lineNumber);
}
var item = Activator.CreateInstance <T>();
for (int i = 0; i < headers.Length; i++)
{
var value = ChangeType(values[i], propertyDescriptors[i].PropertyType, units[i], cultureInfo);
propertyDescriptors[i].SetValue(item, value, null);
}
items.Add(item);
}
return(items);
}
/// <summary>
/// Saves the items to the specified <see cref="StreamWriter"/>.
/// </summary>
/// <typeparam name="T">
/// The type of the items
/// </typeparam>
/// <param name="items">
/// The items.
/// </param>
/// <param name="streamWriter">
/// The <see cref="StreamWriter"/>.
/// </param>
/// <param name="cultureInfo">
/// The output culture.
/// </param>
public static void Save <T>(IEnumerable <T> items, StreamWriter streamWriter, CultureInfo cultureInfo = null)
{
if (cultureInfo == null)
{
cultureInfo = CultureInfo.InvariantCulture;
}
var separator = cultureInfo.TextInfo.ListSeparator;
var type = typeof(T);
var properties =
type.GetTypeInfo().DeclaredProperties
.Where(CsvIgnoreAttribute.IsNotIgnored)
.OrderBy(CsvColumnAttribute.GetColumn)
.ToList();
int n = properties.Count;
var displayUnits = new IQuantity[n];
for (int i = 0; i < n; i++)
{
if (i > 0)
{
streamWriter.Write(separator);
}
streamWriter.Write(properties[i].Name);
var quantityType = CsvFile.GetQuantityType(properties[i].PropertyType);
if (quantityType != null)
{
string unitSymbol;
displayUnits[i] = UnitProvider.Default.GetDisplayUnit(quantityType, out unitSymbol);
streamWriter.Write(" [{0}]", unitSymbol);
}
}
streamWriter.WriteLine();
int j = 0;
foreach (var item in items)
{
if (j++ > 0)
{
streamWriter.WriteLine();
}
for (int i = 0; i < n; i++)
{
if (i > 0)
{
streamWriter.Write(separator);
}
var value = properties[i].GetValue(item, null);
var q = value as IQuantity;
if (q != null && displayUnits[i] != null)
{
streamWriter.Write(string.Format(cultureInfo, "{0}", q.ConvertTo(displayUnits[i])));
}
else
{
streamWriter.Write(string.Format(cultureInfo, "{0}", value));
}
}
}
}
