将带有特殊字符的字符串转换为十六进制 - C#

Question

您好，我正在尝试转换包含 û 和 … 等特殊字符的字符串。

在我的研究和测试中，我几乎成功地使用了以下功能：

public static string ToHex(this string input)
{
    char[] values = input.ToCharArray();
    string hex = "0x";
    string add = "";
    foreach (char c in values)
    {
        int value = Convert.ToInt32(c);
        add = String.Format("{0:X}", value).Length == 1 ? 
            "0" + String.Format("{0:X}", value) + "00" 
            : String.Format("{0:X}", value) + "00";
        hex += add;
    }

    return hex;
}

如果我尝试解码´o¸sçPQ^ûË\u000f±d，它会正确解码并将其转换为0xB4006F00B8007300E700500051005E00FB00CB000F00B1006400，

相反，当我尝试解码 ´o¸sçPQ](ÂF\u0012…a 时，它会失败并将其转换为 0xB4006F00B8007300E700500051005D002800C200460012002026006100 而不是这个 0xB4006F00B8007300E700500051005D002800C2004600120026206100.

进行最少的调试，我看到字符串是从 ´o¸sçPQ](ÂF\u0012…a 到 ´o¸sçPQ](ÂF.a，我不希望这是问题，但我不确定。

编辑

0xB4006F00B8007300E700500051005D002800C2004600120026206100                  ´o¸sçPQ](ÂF…a           CORRECT
0xB4006F00B8007300E700500051005D002800C200460012002026006100                ´o¸sçPQ](ÂF.a       MY OUTPUT

0xB4006F00B8007300E700500051005D003D00CB0042000C00A50061006000AD004500BB00  ´o¸sçPQ]=ËB¥a`­E»         CORRECT
0xB4006F00B8007300E700500051005D003D00CB0042000C00A50061006000AD004500BB00  ´o¸sçPQ]=ËB¥a`­E»         MY OUTPUT

0xB4006F00B8007300E700500051005D002F00D30042001900B7006E006100              ´o¸sçPQ]/ÓB·na          CORRECT
0xB4006F00B8007300E700500051005D002F00D30042001900B7006E006100              ´o¸sçPQ]/ÓB·na      MY OUTPUT

0xB4006F00B8007300E700500051005F001A20BC006B0021003500DD00                  ´o¸sçPQ_‚¼k!5Ý          CORRECT
0xB4006F00B8007300E700500051005F00201A00BC006B0021003500DD00                ´o¸sçPQ_'¼k!5Ý          MY OUTPUT

0xB4006F00B8007300E700500051005D002F00EE006B00290014204E004100              ´o¸sçPQ]/îk)—NA         CORRECT
0xB4006F00B8007300E700500051005D002F00EE006B0029002014004E004100            ´o¸sçPQ]/îk)-NA         MY OUTPUT

0xB4006F00B8007300E700500051005D003800E600690036001C204C004F00              ´o¸sçPQ]8æi6“LO         CORRECT
0xB4006F00B8007300E700500051005D003800E60069003600201C004C004F00            ´o¸sçPQ]8æi6"LO         MY OUTPUT

0xB4006F00B8007300E700500051005D002F00F3006200390014204E004700C602          ´o¸sçPQ]/ób9—NGˆ        CORRECT
0xB4006F00B8007300E700500051005D002F00F300620039002014004E0047002C600       ´o¸sçPQ]/ób9-NG^        MY OUTPUT

0xB4006F00B8007300E700500051005D003B00EE007200330078014100                  ´o¸sçPQ];îr3ŸA          CORRECT
0xB4006F00B8007300E700500051005D003B00EE0072003300178004100                 ´o¸sçPQ];îr3YA          MY OUTPUT

0xB4006F00B8007300E700500051005D003000F20064003E009D004B00                  ´o¸sçPQ]0òd>K           CORRECT
0xB4006F00B8007300E700500051005D003000F20064003E009D004B00                  ´o¸sçPQ]0òd>?K          MY OUTPUT

0xB4006F00B8007300E700500051005D002F00E60075003E00                          ´o¸sçPQ]/æu>            CORRECT
0xB4006F00B8007300E700500051005D002F00E60075003E00                          ´o¸sçPQ]/æu>            MY OUTPUT

0xB4006F00B8007300E700500051005D002F00EE006A003000DC024500                  ´o¸sçPQ]/îj0˜E          CORRECT
0xB4006F00B8007300E700500051005D002F00EE006A0030002DC004500                 ´o¸sçPQ]/îj0~E          MY OUTPUT

提前感谢您的每一个回复或评论，

问候。

Answer 1

这是由于endianness，以及不同的整数和字符串编码。

char cc = '…';
Console.WriteLine(cc);
// 2026  <-- note, hex value differs from byte representation shown below
Console.WriteLine(((int)cc).ToString("x"));
// 26200000
Console.WriteLine(BytesToHex(BitConverter.GetBytes((int)cc)));
// 2620
Console.WriteLine(BytesToHex(Encoding.GetEncoding("utf-16").GetBytes(new[] { cc })));

您不应将字符视为整数。编码字符串有很多不同的方法，.net 内部使用 UTF-16。并且所有编码都适用于字节，而不是整数。将字符显式转换为整数可能会导致意外结果，例如您的结果。为什么不通过Encoding.GetBytes 获得所需的编码并使用字节？

void Main()
{
    // output you expect 0xB4006F00B8007300E700500051005D002800C2004600120026206100
    Console.WriteLine(BytesToHex(Encoding.GetEncoding("utf-16").GetBytes("´o¸sçPQ](ÂF\u0012…a")));
}

public static string BytesToHex(byte[] bytes)
{
    // whatever way to convert bytes to hex
    return "0x" + BitConverter.ToString(bytes).Replace("-", "");
}