学步园

Console.Write写大量字符串异常
 Console.Write 大约写2G字符后就会抛出
Must complete Convert() operation or call Encoder.Reset() before calling GetBytes() or GetByteCount(). Encoder ‘Chinese Simplified (GB2312)’ fallback ‘System.Text.InternalEncoderBestFitFallback’.
 
必须首先完成 Convert() 操作或调用 Encoder.Reset()，然后才能调用 GetBytes() 或 GetByteCount()。 编码器; 简体中文(GB2312)”回退; System.Text.InternalEncoderBestFitFallback”。
 
从堆栈上来是System.Text.DBCSCodePageEncoding.GetBytes函数执行出错！所以这个bug并不仅仅影响Console.Write，对于写文本文件(StreamWriter)同样会出现！ 在网上搜索了一下，似乎亚洲字符都有这个问题，Big5 日文JIS都存在相关的提问，用vs2005和vs2008测试了一下，都存在这个问题.
 

解决方案
 1.
当使用StreamWriter.Write等类似的文件流写入函数时,获取文件大小,当接近2G时,关闭流,以追加方式打开继续写
 
2.使用WriteConsole取代Console.Write,示例如下:

public static class ConsoleEx
{
        public static IntPtr OutHandle
        {
                get
                {
                        if (outHandle == IntPtr.Zero)
                                outHandle = GetStdHandle(StdHandle.STD_OUTPUT_HANDLE);

                        return outHandle;
                }
        }

        public static void Write(string value)
        {
                if (OutHandle == IntPtr.Zero)
                        return;

                int numberOfCharsWritten;
                char[] valueArray = value.ToCharArray();
                WriteConsole(outHandle, valueArray, valueArray.Length, out numberOfCharsWritten, 0);
        }

        public static void Write(string format, params Object[] arg)
        {
                Write(string.Format(format, arg));
        }

        public static void WriteLine(string value)
        {
                Write(value);
                Write(Environment.NewLine);
        }

        public static void WriteLine(string format, params Object[] arg)
        {
                Write(format, arg);
                Write(Environment.NewLine);
        }

        enum StdHandle
        {
                STD_INPUT_HANDLE = -10,
                STD_OUTPUT_HANDLE = -11,
                STD_ERROR_HANDLE = -12
        }

        [System.Runtime.InteropServices.DllImport(Kernel32.dll)]
        static extern IntPtr GetStdHandle(StdHandle nStdHandle);

        [System.Runtime.InteropServices.DllImport(Kernel32.dll)]
        static extern int WriteConsole(
                IntPtr hConsoleOutput,
                char[] lpBuffer,
                int nNumberOfCharsToWrite,
                out int lpNumberOfCharsWritten,
                int lpReserved
        );

        static IntPtr outHandle = IntPtr.Zero;
}