如何将十六进制转换为 0x... 字节格式 (C#)

Question

我想将int转换成hex字符串（这部分没问题）然后将hex字符串转换成byte格式@987654326 @ 以便在数组中使用它。目前我有那个代码：

// Calculate the int that will be convert to Hex string
int totalLenght=11+request.Length;  
// Try to convert it into byte
byte totalLenghtByte=Convert.ToByte( totalLenght.ToString("X"));  
// put it into an array of bytes
xbeeFrame[2] =(totalLenghtByte); 

例如，int 值是 18，因此十六进制字符串是 1D（太棒了！）。但问题是我不知道我是否必须做其他事情才能获得 0x1D 字节......

感谢您的帮助！

Answer 1

尝试使用Convert.ToInt32 方法的重载，该方法从以下位置获取数字基数：

int int32Value = Convert.ToInt32("1D", fromBase: 16);

byte byteValue = Convert.ToByte(int32Value);

---

我不确定是否理解了这个问题。

如果您的意思是将十六进制值转换为其 C# 表示形式（“0xVALUE”），那么只需在生成的十六进制字符串的开头添加该字符即可：

"1D".Insert(0, "0x");

不管怎样，我做了这个功能可以帮助你：

/// <summary>
/// Specifies language style to represent an Hexadecimal value
/// </summary>
public enum HexadecimalStyle : int
{

    /// <summary>
    /// C# Hexadecimal syntax.
    /// </summary>
    CSharp = 0,

    /// <summary>
    /// Visual Basic.Net Hexadecimal syntax.
    /// </summary>
    VbNet = 1

}


/// ----------------------------------------------------------------------------------------------------
/// <summary>
/// Converts an Hexadecimal value to its corresponding representation in the specified language syntax.
/// </summary>
/// ----------------------------------------------------------------------------------------------------
/// <example> This is a code example.
/// <code>
/// Dim value As String = HexadecimalConvert(HexadecimalStyle.CSharp, "48 65 6C 6C 6F 20 57")
/// Dim value As String = HexadecimalConvert(HexadecimalStyle.VbNet, "48 65 6C 6C 6F 20 57")
/// </code>
/// </example>
/// ----------------------------------------------------------------------------------------------------
/// <param name="style">
/// The <see cref="CryptoUtil.HexadecimalStyle"/> to represent the Hexadecimal value.
/// </param>
/// 
/// <param name="value">
/// The Hexadecimal value.
/// </param>
/// 
/// <param name="separator">
/// The string used to separate Hexadecimal sequences.
/// </param>
/// ----------------------------------------------------------------------------------------------------
/// <returns>
/// The resulting value.
/// </returns>
/// ----------------------------------------------------------------------------------------------------
/// <exception cref="InvalidEnumArgumentException">
/// style
/// </exception>
/// ----------------------------------------------------------------------------------------------------
[DebuggerStepThrough()]
public string HexadecimalConvert(HexadecimalStyle style, string value, string separator = "")
{

    string styleFormat = "";

    switch (style) {

        case CryptoUtil.HexadecimalStyle.CSharp:
            styleFormat = "0x{0}";

            break;
        case CryptoUtil.HexadecimalStyle.VbNet:
            styleFormat = "&H{0}";

            break;
        default:

            throw new InvalidEnumArgumentException(argumentName: "style", invalidValue: style, enumClass: typeof(HexadecimalStyle));
    }

    if (!string.IsNullOrEmpty(separator)) {
        value = value.Replace(separator, "");
    }


    if ((value.StartsWith("0x", StringComparison.OrdinalIgnoreCase)) || (value.StartsWith("&H", StringComparison.OrdinalIgnoreCase))) {
        value = value.Substring(2);

    }

    return string.Format(styleFormat, Convert.ToString(value).ToUpper);

}