/// <summary>
/// Constructs a serialization helper object separate from I/O
/// </summary>
/// <param name="settings"></param>
/// <param name="riskyChars"></param>
/// <param name="forceQualifierTypes"></param>
public SerializationHelper(CSVSettings settings, char[] riskyChars, Dictionary <Type, int> forceQualifierTypes)
{
_settings = settings;
if (_settings == null)
{
_settings = CSVSettings.CSV;
}
// Extract properties and fields that are not excluded
var excluded = new ExcludedColumnHelper(_settings);
var props = new List <PropertyInfo>();
foreach (var prop in typeof(T).GetProperties())
{
if (!excluded.IsExcluded(prop.Name))
{
props.Add(prop);
}
}
var fields = new List <FieldInfo>();
foreach (var field in typeof(T).GetFields())
{
if (!excluded.IsExcluded(field.Name))
{
fields.Add(field);
}
}
_properties = props.ToArray();
_fields = fields.ToArray();
_riskyChars = riskyChars;
_forceQualifierTypes = forceQualifierTypes;
}
/// <summary>
/// Construct a new deserialization helper for a specific class containing all the information necessary
/// for optimized deserialization
/// </summary>
/// <param name="settings"></param>
/// <param name="headers"></param>
public DeserializationHelper(CSVSettings settings, string[] headers)
{
var settings1 = settings;
if (settings1 == null)
{
settings1 = CSVSettings.TSV;
}
if (headers == null)
{
throw new Exception("CSV must have headers to be deserialized");
}
var return_type = typeof(T);
_numColumns = headers.Length;
// Set binding flags correctly
var bindings = BindingFlags.Public | BindingFlags.Instance;
if (!settings1.HeadersCaseSensitive)
{
bindings |= BindingFlags.IgnoreCase;
}
// Set up the list of excluded columns
var excluded = new ExcludedColumnHelper(settings1);
// Determine how to handle each column in the file - check properties, fields, and methods
_columnTypes = new Type[_numColumns];
_converters = new TypeConverter[_numColumns];
_properties = new PropertyInfo[_numColumns];
_fields = new FieldInfo[_numColumns];
_methods = new MethodInfo[_numColumns];
for (var i = 0; i < _numColumns; i++)
{
// Is this column excluded?
if (excluded.IsExcluded(headers[i]))
{
continue;
}
// Check if this is a property
_properties[i] = return_type.GetProperty(headers[i], bindings);
if (_properties[i] != null && !_properties[i].CanWrite)
{
if (settings1.IgnoreReadOnlyProperties && settings1.IgnoreHeaderErrors)
{
_properties[i] = null;
continue;
}
throw new Exception($"The column header '{headers[i]}' matches a read-only property. To ignore this exception, enable IgnoreReadOnlyProperties and IgnoreHeaderErrors.");
}
// If we failed to get a property handler, let's try a field handler
if (_properties[i] == null)
{
_fields[i] = return_type.GetField(headers[i], bindings);
// If we failed to get a field handler, let's try a method
if (_fields[i] == null)
{
// Methods must be treated differently - we have to ensure that the method has a single parameter
var mi = return_type.GetMethod(headers[i], bindings);
if (mi != null)
{
if (mi.GetParameters().Length == 1)
{
_methods[i] = mi;
_columnTypes[i] = mi.GetParameters()[0].ParameterType;
}
else if (!settings1.IgnoreHeaderErrors)
{
throw new Exception(
$"The column header '{headers[i]}' matched a method with more than one parameter.");
}
}
else if (!settings1.IgnoreHeaderErrors)
{
throw new Exception(
$"The column header '{headers[i]}' was not found in the class '{return_type.FullName}'.");
}
}
else
{
_columnTypes[i] = _fields[i].FieldType;
}
}
else
{
_columnTypes[i] = _properties[i].PropertyType;
}
if (_columnTypes[i] != null)
{
_converters[i] = TypeDescriptor.GetConverter(_columnTypes[i]);
if (_converters[i] == null && !settings1.IgnoreHeaderErrors)
{
throw new Exception(
$"The column {headers[i]} (type {_columnTypes[i]}) does not have a type converter.");
}
}
}
}