如何将十六进制转换为字节数组? [英] How to convert hex to a byte array?
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问题描述
我从sql server复制粘贴了这个二进制数据,目前无法查询.
I copied and pasted this binary data out of sql server, which I am unable to query at this time.
0xBAC893CAB8B7FE03C927417A2A3F6A60BD30FF35E250011CB25507EBFCD5223B
如何在 C# 中将其转换回字节数组?
How do I convert it back to a byte array in c#?
推荐答案
是这样的:
using System;
public static class Parser
{
static void Main()
{
string hex = "0xBAC893CAB8B7FE03C927417A2A3F6A6"
+ "0BD30FF35E250011CB25507EBFCD5223B";
byte[] parsed = ParseHex(hex);
// Just for confirmation...
Console.WriteLine(BitConverter.ToString(parsed));
}
public static byte[] ParseHex(string hex)
{
int offset = hex.StartsWith("0x") ? 2 : 0;
if ((hex.Length % 2) != 0)
{
throw new ArgumentException("Invalid length: " + hex.Length);
}
byte[] ret = new byte[(hex.Length-offset)/2];
for (int i=0; i < ret.Length; i++)
{
ret[i] = (byte) ((ParseNybble(hex[offset]) << 4)
| ParseNybble(hex[offset+1]));
offset += 2;
}
return ret;
}
static int ParseNybble(char c)
{
if (c >= '0' && c <= '9')
{
return c-'0';
}
if (c >= 'A' && c <= 'F')
{
return c-'A'+10;
}
if (c >= 'a' && c <= 'f')
{
return c-'a'+10;
}
throw new ArgumentException("Invalid hex digit: " + c);
}
}
(现在稍微更高效 - 不需要子字符串...)
( Now slightly more efficient - no substrings required...)
ParseNybble
可能更高效.例如,switch/case 可能更有效率:
It's possible that ParseNybble
could be more efficient. For example, a switch/case may be more efficient:
static int ParseNybble(char c)
{
switch (c)
{
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
return c-'0';
case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
return c-'A'+10;
case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
return c-'a'+10;
}
throw new ArgumentException("Invalid hex digit: " + c);
}
或者可能是一个查找数组:
or possibly a lookup array:
// Omitted for brevity... I'm sure you get the gist
private static readonly int[] NybbleLookup = BuildLookup();
private int ParseNybble(char c)
{
if (c > 'f')
{
throw new ArgumentException("Invalid hex digit: " + c);
}
int ret = NybbleLookup[c];
if (ret == -1)
{
throw new ArgumentException("Invalid hex digit: " + c);
}
return ret;
}
我还没有对其中任何一个进行基准测试,我也不知道哪个是最快的.不过,当前的解决方案可能是最简单的.
I haven't benchmarked any of these, and I've no idea which would be the fastest. The current solution is probably the simplest though.
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