/// <summary>
/// Convert a field value into a write able value
/// </summary>
/// <param name="fieldValue">object value to convert</param>
/// <returns>converted value</returns>
public object CreateValueForField(object fieldValue)
{
object val = null;
if (fieldValue == null)
{
if (NullValue == null)
{
//Did not respect nullable type, so hence second part of boolean expression
if (FieldTypeInternal.IsValueType && !IsNullableType)
{
throw new BadUsageException("Null Value found. You must specify a NullValueAttribute in the " + FieldInfo.Name +
" field of type " + FieldTypeInternal.Name + ", because this is a ValueType.");
}
else
{
val = null;
}
}
else
{
val = NullValue;
}
}
else if (FieldTypeInternal == fieldValue.GetType())
{
val = fieldValue;
}
else
{
if (ConvertProvider == null)
{
val = Convert.ChangeType(fieldValue, FieldTypeInternal, null);
}
else
{
try
{
val = Convert.ChangeType(fieldValue, FieldTypeInternal, null);
}
catch
{
val = ConvertProvider.StringToField(fieldValue.ToString());
}
}
}
return(val);
}
/// <summary>
/// Create field object after extracting the string from the underlying
/// input data
/// </summary>
/// <param name="fieldString">Information extracted?</param>
/// <param name="line">Underlying input data</param>
/// <returns>Object to assign to field</returns>
private AssignResult AssignFromString(ExtractedInfo fieldString, LineInfo line)
{
object val;
var extractedString = fieldString.ExtractedString();
try
{
if (ConvertProvider == null)
{
if (IsStringField)
{
val = TrimString(extractedString);
}
else
{
extractedString = extractedString.Trim();
if (extractedString.Length == 0)
{
return(new AssignResult {
Value = GetNullValue(line), NullValueUsed = true
});
}
else
{
val = Convert.ChangeType(extractedString, FieldTypeInternal, null);
}
}
}
else
{
var trimmedString = extractedString.Trim();
if (ConvertProvider.CustomNullHandling == false &&
trimmedString.Length == 0)
{
return(new AssignResult {
Value = GetNullValue(line), NullValueUsed = true
});
}
else
{
if (TrimMode == FileHelpers.TrimMode.Both)
{
val = ConvertProvider.StringToField(trimmedString);
}
else
{
val = ConvertProvider.StringToField(TrimString(extractedString));
}
if (val == null)
{
return new AssignResult {
Value = GetNullValue(line), NullValueUsed = true
}
}
;
}
}
return(new AssignResult {
Value = val
});
}
catch (ConvertException ex)
{
ex.FieldName = FieldInfo.Name;
ex.LineNumber = line.mReader.LineNumber;
ex.ColumnNumber = fieldString.ExtractedFrom + 1;
throw;
}
catch (BadUsageException)
{
throw;
}
catch (Exception ex)
{
if (ConvertProvider == null || ConvertProvider.GetType().Assembly == typeof(FieldBase).Assembly)
{
throw new ConvertException(extractedString, FieldTypeInternal, FieldInfo.Name, line.mReader.LineNumber, fieldString.ExtractedFrom + 1, ex.Message, ex);
}
else
{
throw new ConvertException(extractedString, FieldTypeInternal, FieldInfo.Name, line.mReader.LineNumber, fieldString.ExtractedFrom + 1, "Your custom converter: " + ConvertProvider.GetType().Name + " throws an " + ex.GetType().Name + " with the message: " + ex.Message, ex);
}
}
}