UTF7Encoding Constructor (Boolean)


Initializes a new instance of the UTF7Encoding class. A parameter specifies whether to allow optional characters.

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

public UTF7Encoding(
	bool allowOptionals


Type: System.Boolean

true to specify that optional characters are allowed; otherwise, false.

If an instance allows optional characters, Unicode code points are encoded with a corresponding optional character instead of a modified base 64 character. The optional characters are exclamation point ("!"), backward slash ("\"), vertical line ("|"), double quote ("""), number sign ("#"), dollar sign ("$"), percent sign ("%"), ampersand ("&"), asterisk ("*"), semicolon (";"), left angle bracket ("<"), right angle bracket (">"), left curly bracket ("{"), right curly bracket ("}"), left square bracket ("["), right square bracket ("]"), equal sign ("="), at sign ("@"), circumflex accent ("^"), underscore ("_"), and grave accent ("`").


UTF7Encoding does not provide error detection. For security reasons, your applications are recommended to use UTF8Encoding, UnicodeEncoding, or UTF32Encoding and enable error detection.

The following code example demonstrates how to create a new UTF7Encoding instance that allows optional characters.

using System;
using System.Text;

class UTF7EncodingExample {
    public static void Main() {

        // A few optional characters.
        string chars = "!@#$";

        // The default Encoding does not allow optional characters.
        // Alternate byte values are used.
        UTF7Encoding utf7 = new UTF7Encoding();
        Byte[] bytes1 = utf7.GetBytes(chars);

        Console.WriteLine("Default UTF7 Encoding:");

        // Convert back to characters.

        // Now, allow optional characters.
        // Optional characters are encoded with their normal code points.
        UTF7Encoding utf7AllowOptionals = new UTF7Encoding(true);
        Byte[] bytes2 = utf7AllowOptionals.GetBytes(chars);

        Console.WriteLine("UTF7 Encoding with optional characters allowed:");

        // Convert back to characters.

    public static void ShowArray(Array theArray) {
        foreach (Object o in theArray) {
            Console.Write("[{0}]", o);

Universal Windows Platform
Available since 10
.NET Framework
Available since 1.1
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