ASCIIEncoding.GetByteCount Method

Definition

Namespace:

System.Text

Assembly:

System.Text.Encoding.Extensions.dll

Calculates the number of bytes produced by encoding a set of characters.

Overloads

GetByteCount(ReadOnlySpan<Char>)	Calculates the number of bytes produced by encoding the specified character span.
GetByteCount(String)	Calculates the number of bytes produced by encoding the characters in the specified String.
GetByteCount(Char*, Int32)	Calculates the number of bytes produced by encoding a set of characters starting at the specified character pointer.
GetByteCount(Char[], Int32, Int32)	Calculates the number of bytes produced by encoding a set of characters from the specified character array.

GetByteCount(ReadOnlySpan<Char>)

Source:

ASCIIEncoding.cs

Calculates the number of bytes produced by encoding the specified character span.

public:
 override int GetByteCount(ReadOnlySpan<char> chars);

public override int GetByteCount (ReadOnlySpan<char> chars);

override this.GetByteCount : ReadOnlySpan<char> -> int

Public Overrides Function GetByteCount (chars As ReadOnlySpan(Of Char)) As Integer

Parameters

chars

ReadOnlySpan<Char>

The span that contains the set of characters to encode.

Returns

Int32

The number of bytes produced by encoding the specified character span.

Remarks

To calculate the exact size required by GetBytes to store the resulting bytes, use GetByteCount. To calculate the maximum size, use GetMaxByteCount. The GetByteCount method generally allows allocation of less memory, while the GetMaxByteCount method generally executes faster.

GetByteCount(String)

Source:

ASCIIEncoding.cs

Calculates the number of bytes produced by encoding the characters in the specified String.

public:
 override int GetByteCount(System::String ^ chars);

public override int GetByteCount (string chars);

override this.GetByteCount : string -> int

Public Overrides Function GetByteCount (chars As String) As Integer

Parameters

chars

String

The String containing the set of characters to encode.

Returns

Int32

The number of bytes produced by encoding the specified characters.

Exceptions

ArgumentNullException

chars is null.

ArgumentOutOfRangeException

The resulting number of bytes is greater than the maximum number that can be returned as an integer.

EncoderFallbackException

A fallback occurred (for more information, see Character Encoding in .NET)

-and-

EncoderFallback is set to EncoderExceptionFallback.

Examples

The following example demonstrates how to use the GetByteCount method to return the number of bytes required to encode a string using ASCIIEncoding.

using namespace System;
using namespace System::Text;
int main()
{
   String^ chars = "ASCII Encoding Example";
   ASCIIEncoding^ ascii = gcnew ASCIIEncoding;
   int byteCount = ascii->GetByteCount( chars );
   Console::WriteLine( " {0} bytes needed to encode string.", byteCount );
}

using System;
using System.Text;

class ASCIIEncodingExample {
    public static void Main() {
        String chars = "ASCII Encoding Example";

        ASCIIEncoding ascii = new ASCIIEncoding();
        int byteCount = ascii.GetByteCount(chars);
        Console.WriteLine(
            "{0} bytes needed to encode string.", byteCount
        );
    }
}

Imports System.Text

Class ASCIIEncodingExample
    Public Shared Sub Main()
        Dim chars As String = "ASCII Encoding Example"

        Dim ascii As New ASCIIEncoding()
        Dim byteCount As Integer = ascii.GetByteCount(chars)
        Console.WriteLine("{0} bytes needed to encode string.", byteCount)
    End Sub
End Class

Remarks

To calculate the exact array size required by GetBytes to store the resulting bytes, the application uses GetByteCount. To calculate the maximum array size, the application should use GetMaxByteCount. The GetByteCount method generally allows allocation of less memory, while the GetMaxByteCount method generally executes faster.

See also

• GetBytes(String, Int32, Int32, Byte[], Int32)
• GetMaxByteCount(Int32)
• GetEncoder()
• Understanding Encodings

GetByteCount(Char*, Int32)

Source:

ASCIIEncoding.cs

Important

This API is not CLS-compliant.

CLS-compliant alternative

System.Text.ASCIIEncoding.GetByteCount(Char[], Int32, Int32)

Calculates the number of bytes produced by encoding a set of characters starting at the specified character pointer.

public:
 override int GetByteCount(char* chars, int count);

[System.CLSCompliant(false)]
public override int GetByteCount (char* chars, int count);

[<System.CLSCompliant(false)>]
override this.GetByteCount : nativeptr<char> * int -> int

Parameters

chars

Char*

A pointer to the first character to encode.

count

Int32

The number of characters to encode.

Returns

Int32

The number of bytes produced by encoding the specified characters.

Attributes

CLSCompliantAttribute

Exceptions

ArgumentNullException

chars is null.

ArgumentOutOfRangeException

count is less than zero.

-or-

The resulting number of bytes is greater than the maximum number that can be returned as an integer.

EncoderFallbackException

A fallback occurred (for more information, see Character Encoding in .NET)

-and-

EncoderFallback is set to EncoderExceptionFallback.

Remarks

To calculate the exact array size required by GetBytes to store the resulting bytes, the application uses GetByteCount. To calculate the maximum array size, the application should use GetMaxByteCount. The GetByteCount method generally allows allocation of less memory, while the GetMaxByteCount method generally executes faster.

See also

• GetBytes(String, Int32, Int32, Byte[], Int32)
• GetMaxByteCount(Int32)
• GetEncoder()

GetByteCount(Char[], Int32, Int32)

Source:

ASCIIEncoding.cs

Calculates the number of bytes produced by encoding a set of characters from the specified character array.

public:
 override int GetByteCount(cli::array <char> ^ chars, int index, int count);

public override int GetByteCount (char[] chars, int index, int count);

override this.GetByteCount : char[] * int * int -> int

Public Overrides Function GetByteCount (chars As Char(), index As Integer, count As Integer) As Integer

Parameters

chars

Char[]

The character array containing the set of characters to encode.

index

Int32

The index of the first character to encode.

count

Int32

The number of characters to encode.

Returns

Int32

The number of bytes produced by encoding the specified characters.

Exceptions

ArgumentNullException

chars is null.

ArgumentOutOfRangeException

index or count is less than zero.

-or-

index and count do not denote a valid range in chars.

-or-

The resulting number of bytes is greater than the maximum number that can be returned as an integer.

EncoderFallbackException

A fallback occurred (for more information, see Character Encoding in .NET)

-and-

EncoderFallback is set to EncoderExceptionFallback.

Examples

The following example demonstrates how to use the GetByteCount method to return the number of bytes required to encode an array of Unicode characters using ASCIIEncoding.

using namespace System;
using namespace System::Text;
int main()
{
   
   // Unicode characters.
   
   // Pi
   // Sigma
   array<Char>^chars = {L'\u03a0',L'\u03a3',L'\u03a6',L'\u03a9'};
   ASCIIEncoding^ ascii = gcnew ASCIIEncoding;
   int byteCount = ascii->GetByteCount( chars, 1, 2 );
   Console::WriteLine( " {0} bytes needed to encode characters.", byteCount.ToString() );
}

using System;
using System.Text;

class ASCIIEncodingExample {
    public static void Main() {
        // Unicode characters.
        Char[] chars = new Char[] {
            '\u0023', // #
            '\u0025', // %
            '\u03a0', // Pi
            '\u03a3'  // Sigma
        };

        ASCIIEncoding ascii = new ASCIIEncoding();
        int byteCount = ascii.GetByteCount(chars, 1, 2);
        Console.WriteLine(
            "{0} bytes needed to encode characters.", byteCount
        );
    }
}

Imports System.Text
Imports Microsoft.VisualBasic.Strings

Class ASCIIEncodingExample
    Public Shared Sub Main()
        ' Unicode characters.
        ' ChrW(35)  = #
        ' ChrW(37)  = %
        ' ChrW(928) = Pi
        ' ChrW(931) = Sigma
        Dim chars() As Char = {ChrW(35), ChrW(37), ChrW(928), ChrW(931)}

        Dim ascii As New ASCIIEncoding()
        Dim byteCount As Integer = ascii.GetByteCount(chars, 1, 2)
        Console.WriteLine("{0} bytes needed to encode characters.", byteCount)
    End Sub
End Class

Remarks

To calculate the exact array size required by GetBytes to store the resulting bytes, the application uses GetByteCount. To calculate the maximum array size, the application should use GetMaxByteCount. The GetByteCount method generally allows allocation of less memory, while the GetMaxByteCount method generally executes faster.

See also

• GetBytes(String, Int32, Int32, Byte[], Int32)
• GetMaxByteCount(Int32)
• GetEncoder()