c# UTF-16转UTF-8 互转
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2022-10-01 17:47:18
/// /// UTF-16转UTF-8 /// /// /// public static string UTF16To8(string str) { string res; int i, len, c; res =... ......
/// <summary> /// utf-16转utf-8 /// </summary> /// <param name="str"></param> /// <returns></returns> public static string utf16to8(string str) { string res; int i, len, c; res = ""; len = str.length; for (i = 0; i < len; i++) { c = convert.tobyte(str[i]); if ((c >= 0x0001) && (c <= 0x007f)) { res += str.charat(i); } else if (c > 0x07ff) { res += convert.tochar(0xe0 | ((c >> 12) & 0x0f)); res += convert.tochar(0x80 | ((c >> 6) & 0x3f)); res += convert.tochar(0x80 | ((c >> 0) & 0x3f)); } else { res += convert.tochar(0xc0 | ((c >> 6) & 0x1f)); res += convert.tochar(0x80 | ((c >> 0) & 0x3f)); } } return res; }
/// <summary> /// utf-8转utf-16 /// </summary> /// <param name="str"></param> /// <returns></returns> public static string utf8to16(string str) { string res; int i, len, c; int char2, char3; res = ""; len = str.length; i = 0; while (i < len) { c = convert.tobyte(str[i++]); switch (c >> 4) { case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: // 0xxxxxxx res += str.charat(i - 1); break; case 12: case 13: // 110x xxxx 10xx xxxx char2 = convert.tobyte(str[i++]); res += convert.tochar(((c & 0x1f) << 6) | (char2 & 0x3f)); break; case 14: // 1110 xxxx 10xx xxxx 10xx xxxx char2 = convert.tobyte(str[i++]); char3 = convert.tobyte(str[i++]); res += convert.tochar(((c & 0x0f) << 12) | ((char2 & 0x3f) << 6) | ((char3 & 0x3f) << 0)); break; } } return res; }
public static class te { /// <summary> /// 返回指定位置字符 /// </summary> /// <param name="str">原字符串</param> /// <param name="index">字符索引,长度超出时返回:' '</param> /// <returns></returns> public static char charat(this string str, int index) { if (index > str.length) return ' '; string res = str.substring(index, 1); return convert.tochar(res); } }
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