C#完成獲得文本文件的編碼的一個類(辨別GB2312和UTF8)。本站提示廣大學習愛好者:(C#完成獲得文本文件的編碼的一個類(辨別GB2312和UTF8))文章只能為提供參考,不一定能成為您想要的結果。以下是C#完成獲得文本文件的編碼的一個類(辨別GB2312和UTF8)正文
以下是獲得文件編碼的一個類:
using System; using System.IO; using System.Text; /// <summary> /// FileEncoding 的摘要解釋 /// </summary> namespace FileEncoding { /// <summary> /// 獲得文件的編碼格局 /// </summary> public class EncodingType { /// <summary> /// 給定文件的途徑,讀取文件的二進制數據,斷定文件的編碼類型 /// </summary> /// <param name="FILE_NAME">文件途徑</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> /// 經由過程給定的文件流,斷定文件的編碼類型 /// </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> /// 斷定能否是不帶 BOM 的 UTF8 格局 /// </summary> /// <param name="data"></param> /// <returns></returns> private static bool IsUTF8Bytes(byte[] data) { int charByteCounter = 1; //盤算以後正剖析的字符應還有的字節數 byte curByte; //以後剖析的字節. for (int i = 0; i < data.Length; i++) { curByte = data[i]; if (charByteCounter == 1) { if (curByte >= 0x80) { //斷定以後 while (((curByte <<= 1) & 0x80) != 0) { charByteCounter++; } //標志位首位若為非0 則至多以2個1開端 如:110XXXXX...........1111110X if (charByteCounter == 1 || charByteCounter > 6) { return false; } } } else { //若是UTF-8 此時第一名必需為1 if ((curByte & 0xC0) != 0x80) { return false; } charByteCounter--; } } if (charByteCounter > 1) { throw new Exception("非預期的byte格局"); } return true; } } }
以下是應用示例:
#region 翻開按鈕 /// <summary> /// 翻開按鈕 /// </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 = "";//留意這裡寫途徑時要用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