Use this method to obtain a standard encoding dictionary for use
with PDF text operators.
Note that the encoding dictionary is defined purely by the
language and direction provided as arguments to this function. It
is your responsibility to ensure that the returned encoding
dictionary is only used with fonts that already have this encoding.
If instead you need to encode text using the font encoding specific
to this particular font see the EncodeText method.
Since the Unicode LanguageType is already Unicode the encoding
for this type is identity. For this reason an exception will be
thrown if an encoding for this type is requested.
See the Fonts and
Languages section for details on language types.