ASCIIEncoding.GetBytes Method (Char[], Int32, Int32, Byte[], Int32)
Encodes a set of characters from the specified character array into the specified byte array.
Assembly: mscorlib (in mscorlib.dll)
public override int GetBytes( char[] chars, int charIndex, int charCount, byte[] bytes, int byteIndex )
Parameters
- chars
- Type: System.Char[]
The character array containing the set of characters to encode.
- charIndex
- Type: System.Int32
The index of the first character to encode.
- charCount
- Type: System.Int32
The number of characters to encode.
- bytes
- Type: System.Byte[]
The byte array to contain the resulting sequence of bytes.
- byteIndex
- Type: System.Int32
The index at which to start writing the resulting sequence of bytes.
| Exception | Condition |
|---|---|
| ArgumentNullException |
chars is null. -or- bytes is null. |
| ArgumentOutOfRangeException |
charIndex or charCount or byteIndex is less than zero. -or- charIndex and charCount do not denote a valid range in chars. -or- byteIndex is not a valid index in bytes. |
| ArgumentException |
bytes does not have enough capacity from byteIndex to the end of the array to accommodate the resulting bytes. |
| EncoderFallbackException |
A fallback occurred (see Character Encoding in the .NET Framework for complete explanation) -and- EncoderFallback is set to EncoderExceptionFallback. |
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.
Data to be converted, such as data read from a stream, can be available only in sequential blocks. In this case, or if the amount of data is so large that it needs to be divided into smaller blocks, the application should use the Decoder or the Encoder provided by the GetDecoder method or the GetEncoder method, respectively.
ASCIIEncoding does not provide error detection. Any Unicode character greater than U+007F is encoded as the ASCII question mark ("?").
Caution
|
|---|
|
For security reasons, your application is recommended to use UTF8Encoding, UnicodeEncoding, or UTF32Encoding and enable error detection. |
The following example demonstrates how to use the GetBytes method to encode a range of characters from a string and store the encoded characters in a range of elements in a byte array.
using System; using System.Text; class ASCIIEncodingExample { public static void Main() { Byte[] bytes; String chars = "ASCII Encoding Example"; ASCIIEncoding ascii = new ASCIIEncoding(); int byteCount = ascii.GetByteCount(chars.ToCharArray(), 6, 8); bytes = new Byte[byteCount]; int bytesEncodedCount = ascii.GetBytes(chars, 6, 8, bytes, 0); Console.WriteLine( "{0} bytes used to encode string.", bytesEncodedCount ); Console.Write("Encoded bytes: "); foreach (Byte b in bytes) { Console.Write("[{0}]", b); } Console.WriteLine(); } }
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.
