在C#中将字符串转换为十六进制字符串

时间:2013-06-08 12:37:17

标签: c# .net string hex

我有一个像“sample”这样的字符串。我想以十六进制格式获取一串字符串;像这样:

  "796173767265"

请提供C#语法。

6 个答案:

答案 0 :(得分:105)

首先你需要把它变成byte[],所以这样做:

byte[] ba = Encoding.Default.GetBytes("sample");

然后你就可以得到字符串:

var hexString = BitConverter.ToString(ba);

现在,这将返回一个带有破折号(-)的字符串,这样您就可以使用它:

hexString = hexString.Replace("-", "");

如果你想要摆脱那些。

注意:如果需要,您可以使用其他Encoding

答案 1 :(得分:19)

var result = string.Join("", input.Select(c => ((int)c).ToString("X2")));

OR

var result  =string.Join("", 
                input.Select(c=> String.Format("{0:X2}", Convert.ToInt32(c))));

答案 2 :(得分:19)

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"
    }
}

答案 3 :(得分:9)

在 .NET 5.0 及更高版本中,您可以使用 Convert.ToHexString() 方法。

using System;
using System.Text;

string value = "Hello world";

byte[] bytes = Encoding.UTF8.GetBytes(value);

string hexString = Convert.ToHexString(bytes);

Console.WriteLine($"String value: \"{value}\"");
Console.WriteLine($"   Hex value: \"{hexString}\"");

运行上面的示例代码,您将获得以下输出:

String value: "Hello world"
   Hex value: "48656C6C6F20776F726C64"

答案 4 :(得分:8)

根据此代码段here,此方法应该适用于长字符串:

private string StringToHex(string hexstring)
{
    StringBuilder sb = new StringBuilder();
    foreach (char t in hexstring)
    { 
        //Note: X for upper, x for lower case letters
        sb.Append(Convert.ToInt32(t).ToString("x")); 
    }
    return sb.ToString();
}

用法:

string result = StringToHex("Hello world"); //returns "48656c6c6f20776f726c64"

一行中的另一种方法

string input = "Hello world";
string result = String.Concat(input.Select(x => ((int)x).ToString("x")));

答案 5 :(得分:2)

少数Unicode替代品

var s = "0";

var s1 = s.Aggregate("", (h, c) => h + ((int)c).ToString("x4"));          // left padded with 0       "0030d835dfcfd835dfdad835dfe5d835dff0d835dffb"
var s2 = s.Aggregate("", (h, c) => h + string.Format("{0,4:x}", (int)c)); // left padded with space   "  30d835dfcfd835dfdad835dfe5d835dff0d835dffb"

var sL = BitConverter.ToString(Encoding.Unicode.GetBytes(s)).Replace("-", "");       // Little Endian "300035D8CFDF35D8DADF35D8E5DF35D8F0DF35D8FBDF"
var sB = BitConverter.ToString(Encoding.BigEndianUnicode.GetBytes(s)).Replace("-", ""); // Big Endian "0030D835DFCFD835DFDAD835DFE5D835DFF0D835DFFB"

// no encodding "300035D8CFDF35D8DADF35D8E5DF35D8F0DF35D8FBDF"
byte[] b = new byte[s.Length * sizeof(char)];
Buffer.BlockCopy(s.ToCharArray(), 0, b, 0, b.Length);
var sb = BitConverter.ToString(b).Replace("-", "");