本文整理汇总了C#中System.Text.EncoderExceptionFallback类的典型用法代码示例。如果您正苦于以下问题：C# EncoderExceptionFallback类的具体用法？C# EncoderExceptionFallback怎么用？C# EncoderExceptionFallback使用的例子？那么, 这里精选的类代码示例或许可以为您提供帮助。
EncoderExceptionFallback类属于System.Text命名空间，在下文中一共展示了EncoderExceptionFallback类的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: Main
// This example demonstrates the EncoderExceptionFallback class.
using System;
using System.Text;
class Sample
{
public static void Main()
{
// Create an encoding, which is equivalent to calling the
// ASCIIEncoding class constructor.
// The EncoderExceptionFallback parameter causes an exception to
// be thrown when a character cannot be encoded.
// A decoder exception fallback is also specified, but it is not
// used because this example terminates during the encoding operation.
Encoding ae = Encoding.GetEncoding(
"us-ascii",
new EncoderExceptionFallback(),
new DecoderExceptionFallback());
// The input string consists of the Unicode characters LEFT POINTING
// DOUBLE ANGLE QUOTATION MARK (U+00AB), 'X' (U+0058), and RIGHT POINTING
// DOUBLE ANGLE QUOTATION MARK (U+00BB).
// The encoding can only encode characters in the US-ASCII range of U+0000
// through U+007F. Consequently, the characters bracketing the 'X' character
// cause an exception.
string inputString = "\u00abX\u00bb";
string twoNewLines = "\n\n";
byte[] encodedBytes = new byte[ae.GetMaxByteCount(inputString.Length)];
int numberOfEncodedBytes = 0;
// --------------------------------------------------------------------------
Console.Clear();
// Display the name of the encoding.
Console.WriteLine("The name of the encoding is \"{0}\".\n", ae.WebName);
// Display the input string in text.
Console.WriteLine("Input string ({0} characters): \"{1}\"",
inputString.Length, inputString);
// Display the input string in hexadecimal.
Console.Write("Input string in hexadecimal: ");
foreach (char c in inputString.ToCharArray()) {
Console.Write("0x{0:X2} ", (int)c);}
Console.Write(twoNewLines);
// --------------------------------------------------------------------------
// Attempt to encode the input string. However, an exception is thrown before
// the input string can be encoded.
Console.WriteLine("Encode the input string...");
// The code example terminates during the call to the GetBytes() method.
try {
numberOfEncodedBytes = ae.GetBytes(inputString, 0, inputString.Length,
encodedBytes, 0);
}
catch (EncoderFallbackException e)
{
Console.WriteLine(e);
Console.WriteLine("\n*** THE CODE EXAMPLE TERMINATES HERE AS INTENDED. ***");
return;
}
// This statement is never executed.
Console.WriteLine("This statement is never executed.");
}
}输出：
The name of the encoding is "us-ascii". Input string (3 characters): "«X»" Input string in hexadecimal: 0xAB 0x58 0xBB Encode the input string... System.Text.EncoderFallbackException: Unable to translate Unicode character \u00AB at inde x 0 to specified code page. at System.Text.EncoderExceptionFallbackBuffer.Fallback(Char charUnknown, Int32 index) at System.Text.EncoderFallbackBuffer.InternalFallback(Char ch, Char*& chars) at System.Text.ASCIIEncoding.GetBytes(Char* chars, Int32 charCount, Byte* bytes, Int32 byteCount, EncoderNLS encoder) at System.Text.ASCIIEncoding.GetBytes(String chars, Int32 charIndex, Int32 charCount, B yte[] bytes, Int32 byteIndex) at Sample.Main() *** THE CODE EXAMPLE TERMINATES HERE AS INTENDED. ***