C# 从十六进制转换为字符串
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Converting from hex to string
提问by Ivan Prodanov
I need to check for a stringlocated inside a packet that I receive as bytearray. If I use BitConverter.ToString(), I get the bytes as stringwith dashes (f.e.: 00-50-25-40-A5-FF).
I tried most functions I found after a quick googling, but most of them have input parameter type stringand if I call them with the stringwith dashes, It throws an exception.
我需要检查一个string位于我作为byte数组接收的数据包内。如果我使用BitConverter.ToString()，我会像string破折号一样得到字节（fe：00-50-25-40-A5-FF）。
我尝试了快速谷歌搜索后找到的大多数函数，但其中大多数都有输入参数类型string，如果我string用破折号调用它们，它会引发异常。
I need a function that turns hex(as stringor as byte) into the stringthat represents the hexadecimal value(f.e.: 0x31 = 1). If the input parameter is string, the function should recognize dashes(example "47-61-74-65-77-61-79-53-65-72-76-65-72"), because BitConverterdoesn't convert correctly.
我需要一个将 hex(asstring或 as byte) 转换为string表示十六进制值的函数(fe: 0x31 = 1)。如果输入参数是string，函数应该识别破折号（例如“47-61-74-65-77-61-79-53-65-72-76-65-72”），因为BitConverter不能正确转换。
采纳答案by Marc Gravell
Like so?
像这样？
static void Main()
{
byte[] data = FromHex("47-61-74-65-77-61-79-53-65-72-76-65-72");
string s = Encoding.ASCII.GetString(data); // GatewayServer
}
public static byte[] FromHex(string hex)
{
hex = hex.Replace("-", "");
byte[] raw = new byte[hex.Length / 2];
for (int i = 0; i < raw.Length; i++)
{
raw[i] = Convert.ToByte(hex.Substring(i * 2, 2), 16);
}
return raw;
}
回答by Dead account
string str = "47-61-74-65-77-61-79-53-65-72-76-65-72";
string[] parts = str.Split('-');
foreach (string val in parts)
{
int x;
if (int.TryParse(val, out x))
{
Console.Write(string.Format("{0:x2} ", x);
}
}
Console.WriteLine();
You can split the string at the -
Convert the text to ints (int.TryParse)
Output the int as a hex string {0:x2}
您可以在 -
Convert the text to ints (int.TryParse)
Output the int as a hex string {0:x2}
回答by Will Dean
Your reference to "0x31 = 1" makes me think you're actually trying to convert ASCII values to strings - in which case you should be using something like Encoding.ASCII.GetString(Byte[])
您对“0x31 = 1”的引用让我觉得您实际上是在尝试将 ASCII 值转换为字符串 - 在这种情况下，您应该使用类似 Encoding.ASCII.GetString(Byte[])
回答by franckspike
For Unicode support:
对于 Unicode 支持：
public class HexadecimalEncoding
{
public static string ToHexString(string str)
{
var sb = new StringBuilder();
var bytes = Encoding.Unicode.GetBytes(str);
foreach (var t in bytes)
{
sb.Append(t.ToString("X2"));
}
return sb.ToString(); // returns: "48656C6C6F20776F726C64" for "Hello world"
}
public static string FromHexString(string hexString)
{
var bytes = new byte[hexString.Length / 2];
for (var i = 0; i < bytes.Length; i++)
{
bytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);
}
return Encoding.Unicode.GetString(bytes); // returns: "Hello world" for "48656C6C6F20776F726C64"
}
}
回答by FyCyka LK
If you need the result as byte array, you should pass it directly without changing it to a string, then change it back to bytes.
In your example the (f.e.: 0x31 = 1) is the ASCII codes. In that case to convert a string (of hex values) to ASCII values use:
Encoding.ASCII.GetString(byte[])
如果您需要将结果作为字节数组，则应直接将其传递而不将其更改为字符串，然后将其更改回字节。在您的示例中， (fe: 0x31 = 1) 是 ASCII 代码。在这种情况下，要将字符串（十六进制值）转换为 ASCII 值，请使用：
Encoding.ASCII.GetString(byte[])
byte[] data = new byte[] { 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x30 };
string ascii=Encoding.ASCII.GetString(data);
Console.WriteLine(ascii);
The console will display: 1234567890
控制台会显示：1234567890
回答by Pawel Cioch
string hexString = "8E2";
int num = Int32.Parse(hexString, System.Globalization.NumberStyles.HexNumber);
Console.WriteLine(num);
//Output: 2274
