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// <Snippet4>
using System;
using System.Text;
public class Example
{
public static void Main()
{
Encoding enc = Encoding.GetEncoding("us-ascii",
new EncoderExceptionFallback(),
new DecoderExceptionFallback());
string str1 = "\u24C8 \u2075 \u221E";
Console.WriteLine(str1);
foreach (var ch in str1)
Console.Write("{0} ", Convert.ToUInt16(ch).ToString("X4"));
Console.WriteLine("\n");
// Encode the original string using the ASCII encoder.
byte[] bytes = {};
try {
bytes = enc.GetBytes(str1);
Console.Write("Encoded bytes: ");
foreach (var byt in bytes)
Console.Write("{0:X2} ", byt);
Console.WriteLine();
}
catch (EncoderFallbackException e) {
Console.Write("Exception: ");
if (e.IsUnknownSurrogate())
Console.WriteLine("Unable to encode surrogate pair 0x{0:X4} 0x{1:X3} at index {2}.",
Convert.ToUInt16(e.CharUnknownHigh),
Convert.ToUInt16(e.CharUnknownLow),
e.Index);
else
Console.WriteLine("Unable to encode 0x{0:X4} at index {1}.",
Convert.ToUInt16(e.CharUnknown),
e.Index);
return;
}
Console.WriteLine();
// Decode the ASCII bytes.
try {
string str2 = enc.GetString(bytes);
Console.WriteLine("Round-trip: {0}", str1.Equals(str2));
if (! str1.Equals(str2)) {
Console.WriteLine(str2);
foreach (var ch in str2)
Console.Write("{0} ", Convert.ToUInt16(ch).ToString("X4"));
Console.WriteLine();
}
}
catch (DecoderFallbackException e) {
Console.Write("Unable to decode byte(s) ");
foreach (byte unknown in e.BytesUnknown)
Console.Write("0x{0:X2} ");
Console.WriteLine("at index {0}", e.Index);
}
}
}
// The example displays the following output:
// Ⓢ ⁵ ∞
// 24C8 0020 2075 0020 221E
//
// Exception: Unable to encode 0x24C8 at index 0.
// </Snippet4>