如何将十六进制转换为0X ...字节格式（C＃）

Question

我想一个int到hex字符串转换（这部分是确定），然后hex字符串转换为byte格式0x(theHexString)为了使用它到一个数组中。目前我已经得到了代码：（！大）

// 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，所以十六进制字符串是一维。但问题是，我不知道是否为了得到0x1D字节而必须做其他事情......

感谢您的帮助！

Answer 1

尝试使用Convert.ToInt32方法是需要从数字基超载：

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

byte byteValue = Convert.ToByte(int32Value); 

---

我不知道，如果了解的问题。

如果你的意思是你想要的十六进制值转换为它的C＃表示（“0xVALUE”），然后再补充，在所产生的十六进制字符串的开头字符：

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

不管怎么说，我做了此功能将帮助您：

/// <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); 

}