.NET下的string永远是Unicode的,所以只能判断txt文件的Encoding。对于byte[],只有自己知道它的Encoding才能转换为string 转换为其他编码的byte[]。
using System;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using Farproc.Text;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Text;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.IO;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
namespace ConsoleApplication1
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
{
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// <summary>
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/// Class1 的摘要说明。
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// </summary>
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
class Class1
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
{
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// <summary>
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// 应用程序的主入口点。
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// </summary>
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
[STAThread]
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static void Main(string[] args)
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{
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//
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// TODO: 在此处添加代码以启动应用程序
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//
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string fileName = @"e:\a.txt";
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//生成一个big endian Unicode编码格式的文本文件
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StreamWriter sw = new StreamWriter(fileName, false, Encoding.BigEndianUnicode);//你可以试试其他编码,比如Encoding.GetEncoding("GB2312")或UTF8
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sw.Write("这是一个String");
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sw.Close();
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//读取
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Encoding fileEncoding = TxtFileEncoding.GetEncoding(fileName, Encoding.GetEncoding("GB2312"));//取得这txt文件的编码
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Console.WriteLine("这个文本文件的编码为:" + fileEncoding.EncodingName);
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StreamReader sr = new StreamReader(fileName, fileEncoding);//用该编码创建StreamReader
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//用下面的方法虽然可以让系统自动判断文本文件的编码格式,但是我们无法取得该文本文件的编码
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//sr.CurrentEncoding永远为 Unicode(UTF-8)
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//StreamReader sr = new StreamReader(fileName, true);
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//Console.WriteLine("这个文本文件的编码为:" + sr.CurrentEncoding.EncodingName);
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Console.WriteLine("这个文本文件的内容为:" + sr.ReadToEnd());
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sr.Close();
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Console.ReadLine();
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}
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}
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}
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.NET下的string永远是Unicode的,所以只能判断txt文件的Encoding。对于byte[],只有自己知道它的Encoding才能转换为string 转换为其他编码的byte[],一个例外是把整个txt文件通过stream读入byte[]后也可以根据它的前几个字节判断Encoding,对于片断,我们就无能为力了:)
当我们用System.IO.StreamReader读取包含汉字的txt文件时,经常会读出乱码(StreamWriater写文本文件也有类似的问题),原因很简单,就是文件的编码(encoding)和StreamReader/Writer的encoding不对应。
using System;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.Text;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
using System.IO;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
namespace Farproc.Text
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
{
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// <summary>
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// 用于取得一个文本文件的编码方式(Encoding)。
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// </summary>
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
public class TxtFileEncoding
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{
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
public TxtFileEncoding()
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
{
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
//
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
// TODO: 在此处添加构造函数逻辑
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//
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
}
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// <summary>
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// 取得一个文本文件的编码方式。如果无法在文件头部找到有效的前导符,Encoding.Default将被返回。
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// </summary>
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// <param name="fileName">文件名。</param>
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/// <returns></returns>
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public static Encoding GetEncoding(string fileName)
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{
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return GetEncoding(fileName, Encoding.Default);
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}
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/// <summary>
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// 取得一个文本文件流的编码方式。
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// </summary>
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// <param name="stream">文本文件流。</param>
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/// <returns></returns>
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
public static Encoding GetEncoding(FileStream stream)
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{
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return GetEncoding(stream, Encoding.Default);
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}
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// <summary>
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// 取得一个文本文件的编码方式。
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// </summary>
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// <param name="fileName">文件名。</param>
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// <param name="defaultEncoding">默认编码方式。当该方法无法从文件的头部取得有效的前导符时,将返回该编码方式。</param>
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// <returns></returns>
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
public static Encoding GetEncoding(string fileName, Encoding defaultEncoding)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
{
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
FileStream fs = new FileStream(fileName, FileMode.Open);
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
Encoding targetEncoding = GetEncoding(fs, defaultEncoding);
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fs.Close();
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return targetEncoding;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
}
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// <summary>
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// 取得一个文本文件流的编码方式。
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// </summary>
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// <param name="stream">文本文件流。</param>
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// <param name="defaultEncoding">默认编码方式。当该方法无法从文件的头部取得有效的前导符时,将返回该编码方式。</param>
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
/// <returns></returns>
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
public static Encoding GetEncoding(FileStream stream, Encoding defaultEncoding)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
{
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
Encoding targetEncoding = defaultEncoding;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
if(stream != null && stream.Length >= 2)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
{
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
//保存文件流的前4个字节
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
byte byte1 = 0;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
byte byte2 = 0;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
byte byte3 = 0;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
byte byte4 = 0;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
//保存当前Seek位置
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
long origPos = stream.Seek(0, SeekOrigin.Begin);
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stream.Seek(0, SeekOrigin.Begin);
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int nByte = stream.ReadByte();
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byte1 = Convert.ToByte(nByte);
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
byte2 = Convert.ToByte(stream.ReadByte());
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
if(stream.Length >= 3)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
{
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
byte3 = Convert.ToByte(stream.ReadByte());
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
}
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
if(stream.Length >= 4)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
{
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
byte4 = Convert.ToByte(stream.ReadByte());
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
}
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
//根据文件流的前4个字节判断Encoding
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
//Unicode {0xFF, 0xFE};
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
//BE-Unicode {0xFE, 0xFF};
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
//UTF8 = {0xEF, 0xBB, 0xBF};
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
if(byte1 == 0xFE && byte2 == 0xFF)//UnicodeBe
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
{
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
targetEncoding = Encoding.BigEndianUnicode;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
}
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
if(byte1 == 0xFF && byte2 == 0xFE && byte3 != 0xFF)//Unicode
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
{
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
targetEncoding = Encoding.Unicode;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
}
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
if(byte1 == 0xEF && byte2 == 0xBB && byte3 == 0xBF)//UTF8
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
{
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
targetEncoding = Encoding.UTF8;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
}
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
//恢复Seek位置
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
stream.Seek(origPos, SeekOrigin.Begin);
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
}
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
return targetEncoding;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
}
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
}
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
}
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
由于在GB2312和UTF7编码都没有BOM,所以需要指定一个默认的Encoding,在找不到合法的BOM时,将返回这个Encoding。有谁知道如何区分GB2312和UTF7编码txt文件的方法,也请告诉我。
为了解决这个问题,我写了一个类,来取得一个文本文件的encoding,这样我们就可以创建对应的StreamReader和StreamWriter来读写,保证不会出现乱码现象。其实原理很简单,文本编辑器(比如XP自带的记事本)在生成文本文件时,如果编码格式和系统默认的编码(中文系统下默认为GB2312)不一致时,会在txt文件开头部分添加特定的“编码字节序标识(Encoding Bit Order Madk,简写为BOM)”,类似PE格式的"MZ"文件头。这样它在读取时就可以根据这个BOM来确定该文本文件生成时所使用的Encoding。这个BOM我们用记事本等程序打开默认是看不到的,但是用stream按字节读取时是可以读到的。我的这个TxtFileEncoding类就是根据这个BOM“文件头”来确定txt文件生成时用到的编码的。
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由于只是static方法,所以不用new,直接通过类名调用方法,使用起来也很简单。
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