/// <summary>
/// Maps specified property to excel column by index.
/// This can be combined with <see cref="MapByName{TProperty}"/>.
/// When <see cref="FirstRowContainsColumnNames"/> is false, then all properties have to be mapped by index.
/// </summary>
/// <param name="propertyExpression">Expression for specifying the property which is intended for mapping</param>
/// <param name="columnIndex">The column index from excel</param>
/// <typeparam name="TProperty">The type of specified property from expression</typeparam>
/// <exception cref="ArgumentException">When column index is less than 0</exception>
public void MapByIndex <TProperty>(Expression <Func <T, TProperty> > propertyExpression, int columnIndex)
{
if (columnIndex < 0)
{
throw new ArgumentException(MessageDefaults.InvalidColumnIndex(columnIndex));
}
var propertyMap = GetPropertyMapOrThrowException(propertyExpression);
propertyMap.MapStrategy = ExcelIteratorPropertyMapStrategy.ByIndex;
propertyMap.ColumnIndex = columnIndex;
}
/// <summary>
/// Maps specified property to excel column by index.
/// Extremely useful when property name in a class cannot be mapped to an excel column by default.
/// Works only when <see cref="FirstRowContainsColumnNames"/> is set to true.
/// </summary>
/// <param name="propertyExpression">Expression for specifying the property which is intended for mapping</param>
/// <param name="columnName">Column name</param>
/// <typeparam name="TProperty">The type of specified property from expression</typeparam>
/// <exception cref="ArgumentException">When column name is empty</exception>
public void MapByName <TProperty>(Expression <Func <T, TProperty> > propertyExpression, string columnName)
{
if (string.IsNullOrWhiteSpace(columnName))
{
throw new ArgumentException(MessageDefaults.InvalidColumnName(columnName));
}
var propertyMap = GetPropertyMapOrThrowException(propertyExpression);
propertyMap.MapStrategy = ExcelIteratorPropertyMapStrategy.ByName;
propertyMap.ColumnName = columnName;
}
private ExcelIteratorPropertyMap GetPropertyMapOrThrowException <TProperty>(Expression <Func <T, TProperty> > propertyExpression)
{
var propertyName = (propertyExpression.Body as MemberExpression)?.Member.Name;
if (string.IsNullOrWhiteSpace(propertyName))
{
throw new ArgumentException(MessageDefaults.InvalidPropertyExpression, nameof(propertyExpression));
}
var propertyMap = _propertyMaps.FirstOrDefault(p => p.Property.Name.Equals(propertyName))
?? throw new ArgumentException(MessageDefaults.PropertyNotFound <T>(propertyName),
nameof(propertyExpression));
return(propertyMap);
}
private void EnsureCorrectSheetSelected()
{
if (string.IsNullOrWhiteSpace(_configuration.SheetName))
{
return;
}
while (!_dataReader.Name.Equals(_configuration.SheetName, StringComparison.OrdinalIgnoreCase))
{
if (!_dataReader.NextResult())
{
throw new InvalidOperationException(MessageDefaults.SheetNotFound(_configuration.SheetName));
}
}
}
internal static bool TryValidPath(this Type targetType, ParsedPath parsedPath, out string segment, out string message)
{
var location = targetType;
foreach (var parsedSegment in parsedPath.Segments)
{
if (!location.TryGetJsonProperty(parsedSegment, out var jsonProperty))
{
segment = parsedSegment;
message = MessageDefaults.PathSegmentNotFound(parsedSegment);
return(false);
}
location = jsonProperty.PropertyType;
}
segment = null;
message = null;
return(true);
}
private int ResolveIndexByName(ExcelIteratorPropertyMap excelIteratorPropertyMap) =>
_columnIndexAndNamePairs.TryGetValue(excelIteratorPropertyMap.ColumnName, out var columnIndex)
? columnIndex
: throw new InvalidOperationException(
MessageDefaults.CannotMapColumnByName(excelIteratorPropertyMap.ColumnName));
