ASCIIEncoding.GetCharCount Method (Byte[], Int32, Int32)
Assembly: mscorlib (in mscorlib.dll)
public int GetCharCount ( byte[] bytes, int index, int count )
public override function GetCharCount ( bytes : byte[], index : int, count : int ) : int
Not applicable.
Parameters
- bytes
The byte array containing the sequence of bytes to decode.
- index
The index of the first byte to decode.
- count
The number of bytes to decode.
Return Value
The number of characters produced by decoding the specified sequence of bytes.| Exception type | Condition |
|---|---|
| bytes is a null reference (Nothing in Visual Basic). | |
| index or count is less than zero. -or- index and count do not denote a valid range in bytes. -or- The resulting number of bytes is greater than the maximum number that can be returned as an integer. | |
| A fallback occurred (see Understanding Encodings for complete explanation) -and- DecoderFallback is set to DecoderExceptionFallback. |
To calculate the exact array size required by GetChars to store the resulting characters, the application uses GetCharCount. To calculate the maximum array size, the application should use GetMaxCharCount. The GetCharCount method generally allows allocation of less memory, while the GetMaxCharCount method generally executes faster.
The following example demonstrates how to use the GetCharCount method to return the number of characters produced by decoding a range of elements in a byte array.
using System; using System.Text; class ASCIIEncodingExample { public static void Main() { Byte[] bytes = new Byte[] { 65, 83, 67, 73, 73, 32, 69, 110, 99, 111, 100, 105, 110, 103, 32, 69, 120, 97, 109, 112, 108, 101 }; ASCIIEncoding ascii = new ASCIIEncoding(); int charCount = ascii.GetCharCount(bytes, 6, 8); Console.WriteLine( "{0} characters needed to decode bytes.", charCount ); } }
import System.*;
import System.Text.*;
class ASCIIEncodingExample
{
public static void main(String[] args)
{
ubyte bytes[] = new ubyte[] { 65, 83, 67, 73, 73, 32, 69, 110, 99,
111, 100, 105, 110, 103, 32, 69, 120, 97, 109, 112, 108, 101 };
ASCIIEncoding ascii = new ASCIIEncoding();
int charCount = ascii.GetCharCount(bytes, 6, 8);
Console.WriteLine("{0} characters needed to decode bytes.",
String.valueOf(charCount));
} //main
} //ASCIIEncodingExample
Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.