“参数不正确”将Unicode设置为控制台编码时 [英] "The parameter is incorrect" when setting Unicode as console encoding

问题描述

我收到以下错误：

Unhandled Exception: System.IO.IOException: The parameter is incorrect.
 at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
 at System.IO.__Error.WinIOError()
 at System.Console.set_OutputEncoding(Encoding value)
 at (my program)

当我运行以下代码行：

 Console.OutputEncoding = Encoding.Unicode;

任何想法为什么？如果将编码设置为UTF8，我不会收到此错误。

Any idea why? I do not get this error if I set the encoding to UTF8 instead.

推荐答案

Encoding.Unicode是UTF-16，它使用2字节来编码所有字符。 ASCII字符（英文字符）在UTF-8中是相同的（单字节，相同的值），所以这可能是它的工作原理。

Encoding.Unicode is UTF-16 which uses 2 bytes to encode all characters. The ASCII characters (English characters) are the same in UTF-8 (single bytes, same values), so that might be why it works.

我的猜测是Windows命令行管理程序不完全支持Unicode。有趣的是Powershell 2 GUI确实支持UTF-16（据我所知），但程序在那里抛出相同的异常。

My guess is that the Windows Command Shell doesn't fully support Unicode. Funny that the Powershell 2 GUI does support UTF-16 (as far as I know), but the program throws the same exception there.

以下代码可以显示Console对象可以重定向其输出，并支持Encoding.Unicode：

The following code works which shows that the Console object can have its output redirected and support Encoding.Unicode:

FileStream testStream = File.Create("test.txt");
TextWriter writer = new StreamWriter(testStream, Encoding.Unicode);
Console.SetOut(writer);            
Console.WriteLine("Hello World: \u263B");  // unicode smiley face
writer.Close(); // flush the output

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