.net无法识别txt文件编码

Question

将网页以UTF-8另存为文本文件时，再在程序里通过文件前导符判断，是否UTF－8时，无法判断出来，自己新建的文本文件则可以？求指教。

Answer 1

你尝试另存文本文件（保存类型选择UTF-8）：

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Answer 2

当你转换完成后请用notepad++ 或者 editplus打开看看  其编码方式是不是真的已经改成UTF-8了。

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Answer 3

这样是行的

Answer 4

Answer 5

那“我心飞扬”，麻烦你可以确认并标记答案吗？谢谢了。

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Answer 6

关键我是用程序去读取.txt 文件，不能另存为

Answer 7

关键我是用程序去读取.txt 文件，不能另存为

那你必须保证一开始的内容是符合你条件编码的;)

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Answer 8

这文件是客户提供的，客户说就是UTF8或者GB2312，用记事本打开，另存为，确实是，但是用StringReader读的时候无法正确编码。

相关的TXT文件

Answer 9

你StringReader指定编码读取了吗？

string s = File.ReadAllText("d:\\1.txt", Encoding.GetEncoding("gb2312"));
Console.WriteLine(s);

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Answer 10

指定是可以的，关键我事先并不知道它是什么编码，这两个文件我判断不出来，根据前导符也不行，我好纠结啊

Answer 11

或许可以参考这个：

http://www.codeproject.com/Articles/17201/Detect-Encoding-for-In-and-Outgoing-Text

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Answer 12

指定是可以的，关键我事先并不知道它是什么编码，这两个文件我判断不出来，根据前导符也不行，我好纠结啊

或者尝试：

string s = File.ReadAllText("d:\\1.txt", Encoding.Default);
Console.WriteLine(s);

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Answer 13

gb2312可以，UTF8是不行的

Answer 14

那你设法先用If做这样的判断：http://www.2cto.com/kf/201208/149623.html（判断是否UTF8）。

Else部分用我DefaultEncoding方法。

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Answer 15

 public bool IsUTF8(System.IO.FileStream sbInputStream)
        {
            int i;
            byte cOctets;  // octets to go in this UTF-8 encoded character
            byte chr;
            bool bAllAscii = true;
            long iLen = sbInputStream.Length;
            cOctets = 0;
            for (i = 0; i < iLen; i++)
            {
                chr = (byte)sbInputStream.ReadByte();
                if ((chr & 0x80) != 0) bAllAscii = false;
                if (cOctets == 0)
                {
                    if (chr >= 0x80)
                    {
                        do
                        {
                            chr <<= 1;
                            cOctets++;
                        }
                        while ((chr & 0x80) != 0);
                        cOctets--;
                        if (cOctets == 0) return false;
                    }
                }
                else
                {
                    if ((chr & 0xC0) != 0x80)
                    {
                        return false;
                    }
                    cOctets--;
                }
            }
            if (cOctets > 0)
            {
                return false;
            }
            if (bAllAscii)
            {
                return false;
            }
            return true;
        }
最终是用以上的方法解决的，非常感谢大家的回答