Encoding.UTF7 Property
.NET Framework (current version)
Gets an encoding for the UTF-7 format.
Assembly: mscorlib (in mscorlib.dll)
UTF-7 encoding is used primarily in environments that historically have been restricted to 7 bits, such as NNTP and some email applications. Because of issues with robustness and security, you should not use UTF7 encoding in 8-bit environments where UTF-8 encoding can be used instead.
The following example determines the number of bytes required to encode a character array, encodes the characters, and displays the resulting bytes.
using System; using System.Text; public class SamplesEncoding { public static void Main() { // The characters to encode: // 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) // a high-surrogate value (U+D8FF) // a low-surrogate value (U+DCFF) char[] myChars = new char[] { 'z', 'a', '\u0306', '\u01FD', '\u03B2', '\uD8FF', '\uDCFF' }; // Get different encodings. Encoding u7 = Encoding.UTF7; Encoding u8 = Encoding.UTF8; Encoding u16LE = Encoding.Unicode; Encoding u16BE = Encoding.BigEndianUnicode; Encoding u32 = Encoding.UTF32; // Encode the entire array, and print out the counts and the resulting bytes. PrintCountsAndBytes( myChars, u7 ); PrintCountsAndBytes( myChars, u8 ); PrintCountsAndBytes( myChars, u16LE ); PrintCountsAndBytes( myChars, u16BE ); PrintCountsAndBytes( myChars, u32 ); } public static void PrintCountsAndBytes( char[] chars, Encoding enc ) { // Display the name of the encoding used. Console.Write( "{0,-30} :", enc.ToString() ); // Display the exact byte count. int iBC = enc.GetByteCount( chars ); Console.Write( " {0,-3}", iBC ); // Display the maximum byte count. int iMBC = enc.GetMaxByteCount( chars.Length ); Console.Write( " {0,-3} :", iMBC ); // Encode the array of chars. byte[] bytes = enc.GetBytes( chars ); // Display all the encoded bytes. PrintHexBytes( bytes ); } public static void PrintHexBytes( byte[] bytes ) { if (( bytes == null ) || ( bytes.Length == 0 )) Console.WriteLine( "<none>" ); else { for ( int i = 0; i < bytes.Length; i++ ) Console.Write( "{0:X2} ", bytes[i] ); Console.WriteLine(); } } } /* This code produces the following output. System.Text.UTF7Encoding : 18 23 :7A 61 2B 41 77 59 42 2F 51 4F 79 32 50 2F 63 2F 77 2D System.Text.UTF8Encoding : 12 24 :7A 61 CC 86 C7 BD CE B2 F1 8F B3 BF System.Text.UnicodeEncoding : 14 16 :7A 00 61 00 06 03 FD 01 B2 03 FF D8 FF DC System.Text.UnicodeEncoding : 14 16 :00 7A 00 61 03 06 01 FD 03 B2 D8 FF DC FF System.Text.UTF32Encoding : 24 32 :7A 00 00 00 61 00 00 00 06 03 00 00 FD 01 00 00 B2 03 00 00 FF FC 04 00 */
Universal Windows Platform
Available since 10
.NET Framework
Available since 1.1
Available since 10
.NET Framework
Available since 1.1
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