Instead, consider using UTF8 instead of ASCII.

If an 8-bit encoding is expected, then ASCII probably isn't the correct choice. In these cases ASCII encoding is appropriate. Some protocols require ASCII or a subset of ASCII. The following considerations can help you to decide whether to use ASCIIEncoding: Because the ASCIIEncoding class supports only a limited character set, the UTF8Encoding, UnicodeEncoding, and UTF32Encoding classes are better suited for globalized applications. If you use the default encoder returned by the Encoding.ASCII property or the ASCIIEncoding constructor, characters outside that range are replaced with a question mark (?) before the encoding operation is performed. Because ASCII is a 7-bit encoding, ASCII characters are limited to the lowest 128 Unicode characters, from U+0000 to U+007F. Decoding is the process of transforming a sequence of encoded bytes into a set of Unicode characters.ĪSCIIEncoding corresponds to the Windows code page 20127. ' Value at position of Sigma character: 63Įncoding is the process of transforming a set of Unicode characters into a sequence of bytes. ' This Unicode string contains two characters with codes outside the ASCII code ra ' The example displays the following output: ' Notice missing Pi and Sigma characters.ĭim decodedString As String = ascii.GetString(encodedBytes) the value 63, which is the ASCII character code for '?'.Ĭonsole::WriteLine( 'Value at position of Pi character: ', _ Notice that the special characters have been replaced with IEnumerator^ myEnum = encodedBytes->GetEnumerator() Int indexOfSigma = unicodeString->IndexOf( L'Σ' ) Īrray^encodedBytes = ascii->GetBytes( unicodeString )

Int indexOfPi = unicodeString->IndexOf( L'Π' ) Save positions of the special characters for later reference. String^ unicodeString = L'This Unicode String* contains two characters with codes outside the ASCII code range, Pi (Π) and Sigma (Σ).' Ĭonsole::WriteLine( 'Original String*:' ) A Unicode string with two characters outside the ASCII code range. using namespace System ĪSCIIEncoding^ ascii = gcnew ASCIIEncoding Notice the loss of data that occurs when your application uses ASCIIEncoding to encode Unicode characters outside of the ASCII range. The following example demonstrates how to encode Unicode characters into ASCII.

SerializableAttribute ComVisibleAttribute Examples

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