转换文本编码

 

 1 /// <summary>
 2 /// 将文本转化为Unicode编码(自适应4种编码)
 3 /// </summary>
 4 /// <param name="fileName"></param>
 5 /// <returns></returns>
 6 public void ConvertTextToUnicode(string fileName)
 7 {
 8     Encoding encoding = null;
 9     FileStream fs = File.Open(fileName, FileMode.Open, FileAccess.Read);
10     BinaryReader br = new BinaryReader(fs);
11     byte[] bs = br.ReadBytes(3); // 读文件的前个字节
12     br.Close();
13     fs.Close();
14 
15     // 确定编码
16     if (bs.Length > 0)
17     {
18         if (bs[0] == 0xEF && bs[1] == 0xBB && bs[2] == 0xBF)
19         {
20             encoding = Encoding.UTF8;
21         }
22         else if (bs[0] == 0xFF && bs[1] == 0xFE)
23         {
24             //encoding = Encoding.Unicode;
25             return;
26         }
27         else if (bs[0] == 0xFE && bs[1] == 0xFF)
28         {
29             encoding = Encoding.BigEndianUnicode;
30         }
31     }
32 
33     string text = File.ReadAllText(fileName, encoding ?? Encoding.Default); // 读取文本
34     File.WriteAllText(fileName, text, Encoding.Unicode);
35 }