Encoding.Convert Method (Encoding, Encoding, Byte[])


The .NET API Reference documentation has a new home. Visit the .NET API Browser on docs.microsoft.com to see the new experience.

Converts an entire byte array from one encoding to another.

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

public static byte[] Convert(
	Encoding srcEncoding,
	Encoding dstEncoding,
	byte[] bytes


Type: System.Text.Encoding

The encoding format of bytes.

Type: System.Text.Encoding

The target encoding format.

Type: System.Byte[]

The bytes to convert.

Return Value

Type: System.Byte[]

An array of type Byte containing the results of converting bytes from srcEncoding to dstEncoding.

Exception Condition

srcEncoding is null.


dstEncoding is null.


bytes is null.


A fallback occurred (see Character Encoding in the .NET Framework for complete explanation)


srcEncoding.DecoderFallback is set to DecoderExceptionFallback.


A fallback occurred (see Character Encoding in the .NET Framework for complete explanation)


dstEncoding.EncoderFallback is set to EncoderExceptionFallback.

The following example converts a Unicode-encoded string to an ASCII-encoded string. Because the ASCII encoding object returned by the ASCII property uses replacement fallback and the Pi character is not part of the ASCII character set, the Pi character is replaced with a question mark, as the output from the example shows.

using System;
using System.Text;

class Example
   static void Main()
      string unicodeString = "This string contains the unicode character Pi (\u03a0)";

      // Create two different encodings.
      Encoding ascii = Encoding.ASCII;
      Encoding unicode = Encoding.Unicode;

      // Convert the string into a byte array.
      byte[] unicodeBytes = unicode.GetBytes(unicodeString);

      // Perform the conversion from one encoding to the other.
      byte[] asciiBytes = Encoding.Convert(unicode, ascii, unicodeBytes);

      // Convert the new byte[] into a char[] and then into a string.
      char[] asciiChars = new char[ascii.GetCharCount(asciiBytes, 0, asciiBytes.Length)];
      ascii.GetChars(asciiBytes, 0, asciiBytes.Length, asciiChars, 0);
      string asciiString = new string(asciiChars);

      // Display the strings created before and after the conversion.
      Console.WriteLine("Original string: {0}", unicodeString);
      Console.WriteLine("Ascii converted string: {0}", asciiString);
// The example displays the following output:
//    Original string: This string contains the unicode character Pi (Π)
//    Ascii converted string: This string contains the unicode character Pi (?)

Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
Return to top