Char.IsControl Método
Definição
Indica se um caractere Unicode especificado é categorizado como um caractere de controle.Indicates whether a specified Unicode character is categorized as a control character.
Sobrecargas
| IsControl(Char) |
Indica se o caractere Unicode especificado é categorizado como um caractere de controle.Indicates whether the specified Unicode character is categorized as a control character. |
| IsControl(String, Int32) |
Indica se o caractere na posição especificada em uma cadeia de caracteres especificada é categorizado como um caractere de controle.Indicates whether the character at the specified position in a specified string is categorized as a control character. |
Comentários
Os caracteres de controle são formatação e outros caracteres não imprimíveis, como ACK, rótulo, CR, FF, LF e VT.Control characters are formatting and other non-printing characters, such as ACK, BEL, CR, FF, LF, and VT. O padrão Unicode atribui pontos de código de \U0000 a \U001F, \U007F e de \U0080 a \U009F para caracteres de controle.The Unicode standard assigns code points from \U0000 to \U001F, \U007F, and from \U0080 to \U009F to control characters. De acordo com o padrão Unicode, esses valores devem ser interpretados como caracteres de controle, a menos que seu uso seja definido de outra forma por um aplicativo.According to the Unicode standard, these values are to be interpreted as control characters unless their use is otherwise defined by an application. Os caracteres de controle válidos são membros da UnicodeCategory.Control categoria.Valid control characters are members of the UnicodeCategory.Control category.
IsControl(Char)
Indica se o caractere Unicode especificado é categorizado como um caractere de controle.Indicates whether the specified Unicode character is categorized as a control character.
public:
static bool IsControl(char c);
public static bool IsControl (char c);
static member IsControl : char -> bool
Public Shared Function IsControl (c As Char) As Boolean
Parâmetros
- c
- Char
O caractere Unicode a ser avaliado.The Unicode character to evaluate.
Retornos
true se c for um caractere de controle; caso contrário, false.true if c is a control character; otherwise, false.
Exemplos
O exemplo a seguir lista o ponto de código Unicode de cada um dos caracteres de controle.The following example lists the Unicode code point of each of the control characters.
using namespace System;
void main()
{
int charsWritten = 0;
for (int ctr = 0x00; ctr <= 0xFFFF; ctr++)
{
wchar_t ch = ctr;
if (Char::IsControl(ch))
{
Console::Write(L"\U{0:X4} ", ctr);
charsWritten++;
if (charsWritten % 6 == 0)
Console::WriteLine();
}
}
}
// The example displays the following output:
// U0000 U0001 U0002 U0003 U0004 U0005
// U0006 U0007 U0008 U0009 U000A U000B
// U000C U000D U000E U000F U0010 U0011
// U0012 U0013 U0014 U0015 U0016 U0017
// U0018 U0019 U001A U001B U001C U001D
// U001E U001F U007F U0080 U0081 U0082
// U0083 U0084 U0085 U0086 U0087 U0088
// U0089 U008A U008B U008C U008D U008E
// U008F U0090 U0091 U0092 U0093 U0094
// U0095 U0096 U0097 U0098 U0099 U009A
// U009B U009C U009D U009E U009F
using System;
public class ControlChars
{
public static void Main()
{
int charsWritten = 0;
for (int ctr = 0x00; ctr <= 0xFFFF; ctr++)
{
char ch = Convert.ToChar(ctr);
if (char.IsControl(ch))
{
Console.Write(@"\U{0:X4} ", ctr);
charsWritten++;
if (charsWritten % 6 == 0)
Console.WriteLine();
}
}
}
}
// The example displays the following output to the console:
// \U0000 \U0001 \U0002 \U0003 \U0004 \U0005
// \U0006 \U0007 \U0008 \U0009 \U000A \U000B
// \U000C \U000D \U000E \U000F \U0010 \U0011
// \U0012 \U0013 \U0014 \U0015 \U0016 \U0017
// \U0018 \U0019 \U001A \U001B \U001C \U001D
// \U001E \U001F \U007F \U0080 \U0081 \U0082
// \U0083 \U0084 \U0085 \U0086 \U0087 \U0088
// \U0089 \U008A \U008B \U008C \U008D \U008E
// \U008F \U0090 \U0091 \U0092 \U0093 \U0094
// \U0095 \U0096 \U0097 \U0098 \U0099 \U009A
// \U009B \U009C \U009D \U009E \U009F
Module ControlChars
Public Sub Main()
Dim charsWritten As Integer = 0
For ctr As Integer = &H0 To &HFFFF
Dim ch As Char = Convert.ToChar(ctr)
If Char.IsControl(ch) Then
Console.Write("\U{0:X4} ", ctr)
charsWritten += 1
If (charsWritten Mod 6) = 0 Then
Console.WriteLine()
End If
End If
Next
End Sub
End Module
' The example displays the following output to the console:
' \U0000 \U0001 \U0002 \U0003 \U0004 \U0005
' \U0006 \U0007 \U0008 \U0009 \U000A \U000B
' \U000C \U000D \U000E \U000F \U0010 \U0011
' \U0012 \U0013 \U0014 \U0015 \U0016 \U0017
' \U0018 \U0019 \U001A \U001B \U001C \U001D
' \U001E \U001F \U007F \U0080 \U0081 \U0082
' \U0083 \U0084 \U0085 \U0086 \U0087 \U0088
' \U0089 \U008A \U008B \U008C \U008D \U008E
' \U008F \U0090 \U0091 \U0092 \U0093 \U0094
' \U0095 \U0096 \U0097 \U0098 \U0099 \U009A
' \U009B \U009C \U009D \U009E \U009F
Aplica-se a
IsControl(String, Int32)
Indica se o caractere na posição especificada em uma cadeia de caracteres especificada é categorizado como um caractere de controle.Indicates whether the character at the specified position in a specified string is categorized as a control character.
public:
static bool IsControl(System::String ^ s, int index);
public static bool IsControl (string s, int index);
static member IsControl : string * int -> bool
Public Shared Function IsControl (s As String, index As Integer) As Boolean
Parâmetros
- s
- String
Uma cadeia de caracteres.A string.
- index
- Int32
A posição do caractere a ser avaliada em s.The position of the character to evaluate in s.
Retornos
true se o caractere na posição index em s for um caractere de controle, caso contrário, false.true if the character at position index in s is a control character; otherwise, false.
Exceções
s é null.s is null.
index é menor que zero ou maior que a última posição em s.index is less than zero or greater than the last position in s.
Exemplos
O exemplo a seguir enumera os caracteres em uma cadeia de caracteres e determina se há caracteres de controle.The following example enumerates the characters in a string and determines whether any are control characters.
using namespace System;
void main()
{
String ^ sentence = "This is a " + Environment::NewLine + "two-line sentence.";
for (int ctr = 0; ctr < sentence->Length; ctr++)
{
if (Char::IsControl(sentence, ctr))
Console::WriteLine("Control character \\U{0} found in position {1}.",
Convert::ToInt32(sentence[ctr]).ToString("X4"), ctr);
}
}
// The example displays the following output:
// Control character \U000D found in position 10.
// Control character \U000A found in position 11.
using System;
public class ControlChar
{
public static void Main()
{
string sentence = "This is a " + Environment.NewLine + "two-line sentence.";
for (int ctr = 0; ctr < sentence.Length; ctr++)
{
if (Char.IsControl(sentence, ctr))
Console.WriteLine("Control character \\U{0} found in position {1}.",
Convert.ToInt32(sentence[ctr]).ToString("X4"), ctr);
}
}
}
// The example displays the following output to the console:
// Control character \U000D found in position 10.
// Control character \U000A found in position 11.
Module ControlChar
Public Sub Main()
Dim sentence As String = "This is a " & vbCrLf & "two-line sentence."
For ctr As Integer = 0 to sentence.Length - 1
If Char.IsControl(sentence, ctr) Then
Console.WriteLine("Control character \U{0} found in position {1}.", _
Convert.ToInt32(sentence.Chars(ctr)).ToString("X4"), ctr)
End If
Next
End Sub
End Module
' The example displays the following output to the console:
' Control character \U000D found in position 10.
' Control character \U000A found in position 11.