Char::IsHighSurrogate Method (Char)
Indicates whether the specified Char object is a high surrogate.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- c
- Type: System::Char
The Unicode character to evaluate.
Return Value
Type: System::Booleantrue if the numeric value of the c parameter ranges from U+D800 through U+DBFF; otherwise, false.
In addition to representing single characters using a 16-bit code unit, UTF-16 encoding allows abstract characters to be represented using two 16-bit code units, which is known as a surrogate pair. The first element in this pair is the high surrogate. Its code unit can range from U+D800 to U+DBFF. An individual surrogate has no interpretation of its own; it is meaningful only when used as part of a surrogate pair.
The following code example demonstrates the IsHighSurrogate, IsLowSurrogate, and IsSurrogatePair methods.
// This example demonstrates the Char.IsLowSurrogate() method // IsHighSurrogate() method // IsSurrogatePair() method using namespace System; int main() { Char cHigh = L'\xD800'; Char cLow = L'\xDC00'; array<Char>^temp0 = {L'a',L'\xD800',L'\xDC00',L'z'}; String^ s1 = gcnew String( temp0 ); String^ divider = String::Concat( Environment::NewLine, gcnew String( '-',70 ), Environment::NewLine ); Console::WriteLine(); Console::WriteLine( "Hexadecimal code point of the character, cHigh: {0:X4}", (int)cHigh ); Console::WriteLine( "Hexadecimal code point of the character, cLow: {0:X4}", (int)cLow ); Console::WriteLine(); Console::WriteLine( "Characters in string, s1: 'a', high surrogate, low surrogate, 'z'" ); Console::WriteLine( "Hexadecimal code points of the characters in string, s1: " ); for ( int i = 0; i < s1->Length; i++ ) { Console::WriteLine( "s1[{0}] = {1:X4} ", i, (int)s1[ i ] ); } Console::WriteLine( divider ); Console::WriteLine( "Is each of the following characters a high surrogate?" ); Console::WriteLine( "A1) cLow? - {0}", Char::IsHighSurrogate( cLow ) ); Console::WriteLine( "A2) cHigh? - {0}", Char::IsHighSurrogate( cHigh ) ); Console::WriteLine( "A3) s1[0]? - {0}", Char::IsHighSurrogate( s1, 0 ) ); Console::WriteLine( "A4) s1[1]? - {0}", Char::IsHighSurrogate( s1, 1 ) ); Console::WriteLine( divider ); Console::WriteLine( "Is each of the following characters a low surrogate?" ); Console::WriteLine( "B1) cLow? - {0}", Char::IsLowSurrogate( cLow ) ); Console::WriteLine( "B2) cHigh? - {0}", Char::IsLowSurrogate( cHigh ) ); Console::WriteLine( "B3) s1[0]? - {0}", Char::IsLowSurrogate( s1, 0 ) ); Console::WriteLine( "B4) s1[2]? - {0}", Char::IsLowSurrogate( s1, 2 ) ); Console::WriteLine( divider ); Console::WriteLine( "Is each of the following pairs of characters a surrogate pair?" ); Console::WriteLine( "C1) cHigh and cLow? - {0}", Char::IsSurrogatePair( cHigh, cLow ) ); Console::WriteLine( "C2) s1[0] and s1[1]? - {0}", Char::IsSurrogatePair( s1, 0 ) ); Console::WriteLine( "C3) s1[1] and s1[2]? - {0}", Char::IsSurrogatePair( s1, 1 ) ); Console::WriteLine( "C4) s1[2] and s1[3]? - {0}", Char::IsSurrogatePair( s1, 2 ) ); Console::WriteLine( divider ); } /* This example produces the following results: Hexadecimal code point of the character, cHigh: D800 Hexadecimal code point of the character, cLow: DC00 Characters in string, s1: 'a', high surrogate, low surrogate, 'z' Hexadecimal code points of the characters in string, s1: s1[0] = 0061 s1[1] = D800 s1[2] = DC00 s1[3] = 007A ---------------------------------------------------------------------- Is each of the following characters a high surrogate? A1) cLow? - False A2) cHigh? - True A3) s1[0]? - False A4) s1[1]? - True ---------------------------------------------------------------------- Is each of the following characters a low surrogate? B1) cLow? - True B2) cHigh? - False B3) s1[0]? - False B4) s1[2]? - True ---------------------------------------------------------------------- Is each of the following pairs of characters a surrogate pair? C1) cHigh and cLow? - True C2) s1[0] and s1[1]? - False C3) s1[1] and s1[2]? - True C4) s1[2] and s1[3]? - False ---------------------------------------------------------------------- */
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.