以下是获取文件编码的一个类：
using System;
using System.IO;
using System.Text;
///
/// FileEncoding 的摘要说明
///
namespace FileEncoding
{
///
/// 获取文件的编码格式
///
public class EncodingType
{
///
/// 给定文件的路径，读取文件的二进制数据，判断文件的编码类型
///
/// 文件路径
/// 文件的编码类型
public static System.Text.Encoding GetType(string FILE_NAME)
{
FileStream fs = new FileStream(FILE_NAME, FileMode.Open, FileAccess.Read);
Encoding r = GetType(fs);
fs.Close();
return r;
}
///
/// 通过给定的文件流，判断文件的编码类型
///
/// 文件流
/// 文件的编码类型
public static System.Text.Encoding GetType(FileStream fs)
{
byte[] Unicode = new byte[] { 0xFF, 0xFE, 0x41 };
byte[] UnicodeBIG = new byte[] { 0xFE, 0xFF, 0x00 };
byte[] UTF8 = new byte[] { 0xEF, 0xBB, 0xBF }; //带BOM
Encoding reVal = Encoding.Default;
BinaryReader r = new BinaryReader(fs, System.Text.Encoding.Default);
int i;
int.TryParse(fs.Length.ToString(), out i);
byte[] ss = r.ReadBytes(i);
if (IsUTF8Bytes(ss) || (ss[0] == 0xEF && ss[1] == 0xBB && ss[2] == 0xBF))
{
reVal = Encoding.UTF8;
}
else if (ss[0] == 0xFE && ss[1] == 0xFF && ss[2] == 0x00)
{
reVal = Encoding.BigEndianUnicode;
}
else if (ss[0] == 0xFF && ss[1] == 0xFE && ss[2] == 0x41)
{
reVal = Encoding.Unicode;
}
r.Close();
return reVal;
}
///
/// 判断是否是不带 BOM 的 UTF8 格式
///
///
///
private static bool IsUTF8Bytes(byte[] data)
{
int charByteCounter = 1; //计算当前正分析的字符应还有的字节数
byte curByte; //当前分析的字节.
for (int i = 0; i < data.Length; i++)
{
curByte = data[i];
if (charByteCounter == 1)
{
if (curByte >= 0x80)
{
//判断当前
while (((curByte 1)
{
throw new Exception("非预期的byte格式");
}
return true;
}
}
}
以下是使用示例：
#region 打开按钮
///
/// 打开按钮
///
///
///
private void txtMenuOpen_Click(object sender, EventArgs e)
{
string fName;
OpenFileDialog openFileDialog = new OpenFileDialog();
openFileDialog.InitialDirectory = "";//注意这里写路径时要用c:而不是c:
openFileDialog.Filter = "文本文档|*.txt";
openFileDialog.RestoreDirectory = true;
openFileDialog.FilterIndex = 1;
if (openFileDialog.ShowDialog() == DialogResult.OK)
{
fName = openFileDialog.FileName;
txtBox.Text = System.IO.File.ReadAllText(fName,
FileEncoding.EncodingType.GetType(fName));
}
}
#endregion