| isalnum, iswalnum, _isalnum_l, _iswalnum_l, _ismbcalnum, _ismbcalnum_l, _ismbcalpha, _ismbcalpha_l, _ismbcdigit, _ismbcdigit_l | Alphanumeric | System::Char::IsLetterOrDigit. |
| _ismbcalnum, _ismbcalnum_l, _ismbcalpha, _ismbcalpha_l, _ismbcdigit, _ismbcdigit_l | Alphanumeric | Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples. |
| isalpha, iswalpha, _isalpha_l, _iswalpha_l, _ismbcalnum, _ismbcalnum_l, _ismbcalpha, _ismbcalpha_l, _ismbcdigit, _ismbcdigit_l | Alphabetic | System::Char::IsLetter |
| isascii, __isascii, iswascii | ASCII | System::Char::IsLetter |
| isblank, iswblank, _isblank_l, _iswblank_l, _ismbcsblank, _ismbcsblank_l | Blank (space or horizontal tab) | Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples. |
| iscntrl, iswcntrl, _iscntrl_l, _iswcntrl_l | Control | System::Char::IsControl |
| iscsym, iscsymf, __iscsym, __iswcsym, __iscsymf, __iswcsymf, _iscsym_l, _iswcsym_l, _iscsymf_l, _iswcsymf_l | Letter, underscore, or digit | System::Char::IsControl |
| iscsym, iscsymf, __iscsym, __iswcsym, __iscsymf, __iswcsymf, _iscsym_l, _iswcsym_l, _iscsymf_l, _iswcsymf_l | Letter or underscore | System::Char::IsControl |
| isdigit, iswdigit, _isdigit_l, _iswdigit_l, _ismbcalnum, _ismbcalnum_l, _ismbcalpha, _ismbcalpha_l, _ismbcdigit, _ismbcdigit_l | Decimal digit | System::Char::IsDigit |
| isgraph, iswgraph, _isgraph_l, _iswgraph_l, _ismbcgraph, _ismbcgraph_l, _ismbcprint, _ismbcprint_l, _ismbcpunct, _ismbcpunct_l, _ismbcblank, _ismbcblank_l, _ismbcspace, _ismbcspace_l | Printable other than space | Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples. |
| islower, iswlower, _islower_l, _iswlower_l, _ismbclower, _ismbclower_l, _ismbcupper, _ismbcupper_l | Lowercase | System::Char::IsLower |
| _ismbchira, _ismbchira_l, _ismbckata, _ismbckata_l | Hiragana | Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples. |
| _ismbchira, _ismbchira_l, _ismbckata, _ismbckata_l | Katakana | Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples. |
| _ismbclegal, _ismbclegal_l, _ismbcsymbol, _ismbcsymbol_l | Legal multibyte character | Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples. |
| _ismbcl0, _ismbcl0_l, _ismbcl1, _ismbcl1_l, _ismbcl2, _ismbcl2_l | Japan-level 0 multibyte character | Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples. |
| _ismbcl0, _ismbcl0_l, _ismbcl1, _ismbcl1_l, _ismbcl2, _ismbcl2_l | Japan-level 1 multibyte character | Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples. |
| _ismbcl0, _ismbcl0_l, _ismbcl1, _ismbcl1_l, _ismbcl2, _ismbcl2_l | Japan-level 2 multibyte character | Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples. |
| _ismbclegal, _ismbclegal_l, _ismbcsymbol, _ismbcsymbol_l | Non-alphanumeric multibyte character | Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples. |
| isprint, iswprint, _isprint_l, _iswprint_l, _ismbcgraph, _ismbcgraph_l, _ismbcprint, _ismbcprint_l, _ismbcpunct, _ismbcpunct_l, _ismbcblank, _ismbcblank_l, _ismbcspace, _ismbcspace_l | Printable | Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples. |
| ispunct, iswpunct, _ispunct_l, _iswpunct_l, _ismbcgraph, _ismbcgraph_l, _ismbcprint, _ismbcprint_l, _ismbcpunct, _ismbcpunct_l, _ismbcblank, _ismbcblank_l, _ismbcspace, _ismbcspace_l | Punctuation | System::Char::IsPunctuation |
| isspace, iswspace, _isspace_l, _iswspace_l, _ismbcgraph, _ismbcgraph_l, _ismbcprint, _ismbcprint_l, _ismbcpunct, _ismbcpunct_l, _ismbcblank, _ismbcblank_l, _ismbcspace, _ismbcspace_l | White-space | System::Char::IsWhiteSpace |
| Isupper, iswupper, _ismbclower, _ismbclower_l, _ismbcupper, _ismbcupper_l | Uppercase | System::Char::IsUpper |
| _isctype, iswctype, _isctype_l, _iswctype_l | Property specified by desc argument | Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples. |
| isxdigit, iswxdigit, _isxdigit_l, _iswxdigit_l | Hexadecimal digit | System::Char::IsNumber |
| _mbclen, mblen, _mblen_l | Return length of valid multibyte character; result depends on LC_CTYPE category setting of current locale | Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples. |