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Encoding.GetChars Method (Byte[], Int32, Int32)

When overridden in a derived class, decodes a sequence of bytes from the specified byte array into a set of characters.

Namespace:  System.Text
Assembly:  mscorlib (in mscorlib.dll)

public virtual char[] GetChars(
	byte[] bytes,
	int index,
	int count
)

Parameters

bytes
Type: System.Byte[]
The byte array containing the sequence of bytes to decode.
index
Type: System.Int32
The zero-based index of the first byte to decode.
count
Type: System.Int32
The number of bytes to decode.

Return Value

Type: System.Char[]
A character array containing the results of decoding the specified sequence of bytes.

ExceptionCondition
ArgumentNullException

bytes is null.

ArgumentOutOfRangeException

index or count is less than zero.

-or-

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

DecoderFallbackException

A fallback occurred (see Understanding Encodings for complete explanation).

If the data to be converted is available only in sequential blocks (such as data read from a stream) 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, of a derived class.

For a discussion of programming considerations for use of this method, see the Encoding class description.

The following code example encodes a string into an array of bytes, and then decodes a range of the bytes into an array of characters.


using System;
using System.Text;

public class Example
{

   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {

      // Create two instances of UTF32Encoding: one with little-endian byte order and one with big-endian byte order.
      Encoding u32LE = Encoding.GetEncoding("utf-32");
      Encoding u32BE = Encoding.GetEncoding("utf-32BE");

      // Use a string containing the following characters:
      //    Latin Small Letter Z (U+007A)
      //    Latin Small Letter A (U+0061)
      //    Combining Breve (U+0306)
      //    Latin Small Letter AE With Acute (U+01FD)
      //    Greek Small Letter Beta (U+03B2)
      String myStr = "za\u0306\u01FD\u03B2";

      // Encode the string using the big-endian byte order.
      byte[] barrBE = new byte[u32BE.GetByteCount(myStr)];
      u32BE.GetBytes(myStr, 0, myStr.Length, barrBE, 0);

      // Encode the string using the little-endian byte order.
      byte[] barrLE = new byte[u32LE.GetByteCount(myStr)];
      u32LE.GetBytes(myStr, 0, myStr.Length, barrLE, 0);

      // Get the char counts, decode eight bytes starting at index 0,
      // and print out the counts and the resulting bytes.
      outputBlock.Text += "BE array with BE encoding : ";
      PrintCountsAndChars(outputBlock, barrBE, 0, 8, u32BE);
      outputBlock.Text += "LE array with LE encoding : ";
      PrintCountsAndChars(outputBlock, barrLE, 0, 8, u32LE);

   }


   public static void PrintCountsAndChars(System.Windows.Controls.TextBlock outputBlock, byte[] bytes, int index, int count, Encoding enc)
   {

      // Display the name of the encoding used.
      outputBlock.Text += String.Format("{0,-25} :", enc.ToString());

      // Display the exact character count.
      int iCC = enc.GetCharCount(bytes, index, count);
      outputBlock.Text += String.Format(" {0,-3}", iCC);

      // Display the maximum character count.
      int iMCC = enc.GetMaxCharCount(count);
      outputBlock.Text += String.Format(" {0,-3} :", iMCC);

      // Decode the bytes and display the characters.
      char[] chars = enc.GetChars(bytes, index, count);

      // The following is an alternative way to decode the bytes:
      // char[] chars = new char[iCC];
      // enc.GetChars( bytes, index, count, chars, 0 );

      outputBlock.Text += chars + "\n";

   }

}


/* 
This code produces the following output.  The question marks take the place of characters that cannot be displayed at the console.

BE array with BE encoding : System.Text.UTF32Encoding : 2   6   :za
LE array with LE encoding : System.Text.UTF32Encoding : 2   6   :za

*/



Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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