/// <summary>
/// Formats a single field for writing.
/// </summary>
/// <param name="value">The value to format.</param>
/// <param name="field">The descriptor for the current field.</param>
/// <returns>The formatted string.</returns>
private string FormatField(string value, FixedWidthField field)
{
if (value == null)
{
value = string.Empty;
}
if (value.Length < field.Length)
{
FieldAlignment alignment = field.Alignment ?? Options.DefaultAlignment;
char padCharacter = field.PadCharacter ?? Options.DefaultPadCharacter;
if (alignment == FieldAlignment.Left)
{
value = value.PadRight(field.Length, padCharacter);
}
else // FieldAlignment.Right
{
value = value.PadLeft(field.Length, padCharacter);
}
}
else if (value.Length > field.Length)
{
if (Options.ThrowOverflowException)
{
throw new FixedWidthOverflowException(value, field.Length);
}
value = value.Substring(0, field.Length);
}
return(value);
}
/// <summary>
/// Reads the specified field from the given line.
/// </summary>
/// <param name="line">The line that contains all the fields.</param>
/// <param name="field">Field descriptor.</param>
/// <param name="position">The current position within the liine.</param>
/// <returns>The extracted field.</returns>
private string ReadField(string line, FixedWidthField field, ref int position)
{
Debug.Assert(line != null);
Debug.Assert(field != null);
Debug.Assert(position >= 0);
// Extract field
string result;
if (line.Length < position + field.Length)
{
if (Options.ThrowOutOfRangeException)
{
throw new FixedWidthOutOfRangeException();
}
#if NETSTANDARD2_0
result = (position <= line.Length) ? line.Substring(position) : string.Empty;
#else
result = (position <= line.Length) ? line[position..] : string.Empty;