• utf8拥有的字符Ş ,但是gb2312没有Ş ,而gb18030有Ş 。而且gb18030占用的字节数更多


    https://en.wikipedia.org/wiki/List_of_Unicode_characters

    选取一个特殊字符

    U+015E Ş 350 Ş Latin Capital Letter S with cedilla 0286 

    然后尝试处理

     [Test]
            public void Test20210521002()
            {
                var str = "Ş";
                //PrintHexString(Encoding.ASCII, str);  //ascii本身不支持中文的,所以打印出来的是错误的
                PrintHexString(Encoding.UTF8, str);
                PrintHexString(Encoding.BigEndianUnicode, str);
                PrintHexString(Encoding.GetEncoding(936), str);
                PrintHexString(Encoding.GetEncoding(54936), str);
            }
    
            private void PrintHexString(Encoding encoding, string str)
            {
                int count = 0;
                foreach (var c in str)
                {
                    var array = encoding.GetBytes(c.ToString());
                    var hexString = GetHexString(array);
                    Console.WriteLine($"{c}, {encoding.WebName}, U+{hexString}, {string.Join(string.Empty,array.Select(GetBinaryString))}");
                    count += array.Length;
                }
                Console.WriteLine($"【{str}】 occupy {count} bytes when encoded by {encoding.WebName}");
                Console.WriteLine();
            }
    
            private string GetBinaryString(byte b)
            {
                return Convert.ToString(b, 2).PadLeft(8, '0');
            }
    
            private string GetHexString(byte[] array)
            {
                var list = array.Select(x => x.ToString("X2"));
                var str = string.Join(string.Empty, list);
                return str;
            }
    
            [Test]
            public void Test20210521003()
            {
                var array = new byte[] {0xc5, 0x9e};
                Encoding utf8 = Encoding.UTF8;
                var str1 = utf8.GetString(array);
                Console.WriteLine(str1);
    
                var array4 = new byte[] { 0x01, 0x5e };
                Encoding utf16 = Encoding.BigEndianUnicode;
                var str4 = utf16.GetString(array4);
                Console.WriteLine(str4);
    
                var array2 = new byte[] {0x35};
                Encoding gb2312 = Encoding.GetEncoding(936);
                var str2 = gb2312.GetString(array2);
                Console.WriteLine(str2);
    
                var array3 = new byte[] {0x81, 0x30, 0x94, 0x35};
                Encoding gb18030 = Encoding.GetEncoding(54936);
                var str3 = gb18030.GetString(array3);
                Console.WriteLine(str3);
    
            }

    Ş, utf-8, U+C59E, 1100010110011110
    【Ş】 occupy 2 bytes when encoded by utf-8

    Ş, utf-16BE, U+015E, 0000000101011110
    【Ş】 occupy 2 bytes when encoded by utf-16BE

    Ş, gb2312, U+3F, 00111111  这个是错误的
    【Ş】 occupy 1 bytes when encoded by gb2312

    Ş, GB18030, U+81309435, 10000001001100001001010000110101
    【Ş】 occupy 4 bytes when encoded by GB18030

    把上面的字节,反过来输出成字符的话

    Ş  utf8
    Ş   utf16
    5   gb2312  因为上面的输出就是错误的,所以这里没法得到正确的。而且gb2312本身不支持Ş 
    Ş  gb18030

    https://www.qqxiuzi.cn/bianma/guobiaoma.php  千千秀字

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  • 原文地址:https://www.cnblogs.com/chucklu/p/14793394.html
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