using System;
using System.IO;
using System.Text;
 
/// <summary>
/// FileEncoding 的摘要說明
/// </summary>
namespace FileEncoding
{
/// <summary>
/// 獲取文件的編碼格式
/// </summary>
public class EncodingType
{
/// <summary>
/// 給定文件的路徑，讀取文件的二進制數(shù)據(jù)，判斷文件的編碼類型
/// </summary>
/// <param name="FILE_NAME">文件路徑</param>
/// <returns>文件的編碼類型</returns>
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;
}
 
/// <summary>
/// 通過給定的文件流，判斷文件的編碼類型
/// </summary>
/// <param name="fs">文件流</param>
/// <returns>文件的編碼類型</returns>
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 }; //帶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;
 
}
 
/// <summary>
/// 判斷是否是不帶 BOM 的 UTF8 格式
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
private static bool IsUTF8Bytes(byte[] data)
{
int charByteCounter = 1; //計算當前正分析的字符應還有的字節(jié)數(shù)
byte curByte; //當前分析的字節(jié).
for (int i = 0; i < data.Length; i++)
{
curByte = data[i];
if (charByteCounter == 1)
{
if (curByte >= 0x80)
{
//判斷當前
while (((curByte <<= 1) & 0x80) != 0)
{
charByteCounter++;
}
//標記位首位若為非0 則至少以2個1開始 如:110XXXXX...........1111110X 
if (charByteCounter == 1 || charByteCounter > 6)
{
return false;
}
}
}
else
{
//若是UTF-8 此時第一位必須為1
if ((curByte & 0xC0) != 0x80)
{
return false;
}
charByteCounter--;
}
}
if (charByteCounter > 1)
{
throw new Exception("非預期的byte格式");
}
return true;
}
 
}
 
 
}

#region 打開按鈕
/// <summary>
/// 打開按鈕
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void txtMenuOpen_Click(object sender, EventArgs e)
{
string fName;
OpenFileDialog openFileDialog = new OpenFileDialog();
openFileDialog.InitialDirectory = "";//注意這里寫路徑時要用c:而不是c: 
openFileDialog.Filter = "文本文檔|*.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