目录
C# string转换为几种不同编码的Byte[]
1.string–>Byte[]转换
①String类型转换为UTF8编码的Byte[]：
string strvalue ="00123aabbAA$%"; byte[] byteArray = System.Text.Encoding.UTF8.GetBytes(strvalue);
②string类型转换为ASCII编码的Byte[]：
string strvalue ="00123aabbAA$%"; byte[] byteArray = System.Text.Encoding.ASCII.GetBytes (strvalue);
③string类型转换为GB18030编码的Byte[]；
string strvalue ="00123aabbAA$%"：
byte[] byteArray = System.Text.Encoding.GetEncoding("GB18030").GetBytes (strvalue);
2.Byte[]–>string转换
①UTF8编码的Byte[]转换为String类型：
byte[] byteArray = new byte[100]; String str = System.Text.Encoding.UTF8.GetString ( byteArray );
②ASCII编码的Byte[]转换为String类型：
byte[] byteArray = new byte[100]; String str = System.Text.Encoding.ASCII.GetString ( byteArray );
③GB18030编码的Byte[]转换为String类型：
byte[] byteArray = new byte[100];
String str = System.Text.Encoding.GetEncoding("GB18030").GetString ( byteArray );
下面对上面的类型转换
举例说明：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace TRansfer
{
class Program
{
static void Main(string[] args)
{
string strvalue = "0aA$%#@!%^&*_+-=中国";
byte[] byteArray1 = System.Text.Encoding.UTF8.GetBytes(strvalue);
byte[] byteArray2 = System.Text.Encoding.ASCII.GetBytes(strvalue);
byte[] byteArray3 = System.Text.Encoding.GetEncoding("GB18030").GetBytes(strvalue);
byte[] byteArray11 = new byte[100];
String str1 = System.Text.Encoding.UTF8.GetString(byteArray1);
String str2 = System.Text.Encoding.ASCII.GetString(byteArray2);
String str3 = System.Text.Encoding.GetEncoding("GB18030").GetString(byteArray3);
string st1 = "";
foreach (byte b in byteArray1)
{
st1 += b.ToString();
}
string st2 = "";
foreach (byte b in byteArray2)
{
st2 += b.ToString();
}
string st3 = "";
foreach (byte b in byteArray3)
{
st3 += b.ToString();
}
Console.WriteLine("{0} {1}", st1, str1);
Console.WriteLine("{0} {1}", st2, str2);
Console.WriteLine("{0} {1}", st3, str3);
}
}
}
测试结果如下，对英文字符的翻译都是一致，各种不同的编码的差别主要体现在中文上面：
![C# string转换为几种不同编码的Byte[]的问题解读](https://www.freexyz.cn/d/file/20230625/7ddaa7f98fc391d79bcf5afa26daa3e8.jpg)
C#分享几种常用的编码转换，base64、MD5、string
C# Base64编码
class Base64Helper
{
/// <summary>
/// Base64加密，采用utf8编码方式加密
/// </summary>
/// <param name="source">待加密的明文</param>
/// <returns>加密后的字符串</returns>
public static string Base64Encode(string source)
{
return Base64Encode(Encoding.UTF8, source);
}
/// <summary>
/// Base64加密
/// </summary>
/// <param name="encodeType">加密采用的编码方式</param>
/// <param name="source">待加密的明文</param>
/// <returns></returns>
public static string Base64Encode(Encoding encodeType, string source)
{
string encode = string.Empty;
byte[] bytes = encodeType.GetBytes(source);
try
{
encode = Convert.ToBase64String(bytes);
}
catch
{
encode = source;
}
return encode;
}
/// <summary>
/// Base64解密，采用utf8编码方式解密
/// </summary>
/// <param name="result">待解密的密文</param>
/// <returns>解密后的字符串</returns>
public static string Base64Decode(string result)
{
return Base64Decode(Encoding.UTF8, result);
}
/// <summary>
/// Base64解密
/// </summary>
/// <param name="encodeType">解密采用的编码方式，注意和加密时采用的方式一致</param>
/// <param name="result">待解密的密文</param>
/// <returns>解密后的字符串</returns>
public static string Base64Decode(Encoding encodeType, string result)
{
string decode = string.Empty;
byte[] bytes = Convert.FromBase64String(result);
try
{
decode = encodeType.GetString(bytes);
}
catch
{
decode = result;
}
return decode;
}
}
C# 文件与二进制流
/// <summary>
/// 将文件转换为byte数组
/// </summary>
/// <param name="path">文件地址</param>
/// <returns>转换后的byte数组</returns>
public static byte[] File2Bytes(string path)
{
if (!System.IO.File.Exists(path))
{
return new byte[0];
}
FileInfo fi = new FileInfo(path);
byte[] buff = new byte[fi.Length];
FileStream fs = fi.OpenRead();
fs.Read(buff, 0, Convert.ToInt32(fs.Length));
fs.Close();
return buff;
}
/// <summary>
/// 将byte数组转换为文件并保存到指定地址
/// </summary>
/// <param name="buff">byte数组</param>
/// <param name="savepath">保存地址</param>
public static void Bytes2File(byte[] buff, string savepath)
{
if (System.IO.File.Exists(savepath))
{
System.IO.File.Delete(savepath);
}
FileStream fs = new FileStream(savepath, FileMode.CreateNew);
BinaryWriter bw = new BinaryWriter(fs);
bw.Write(buff, 0, buff.Length);
bw.Close();
fs.Close();
}
C# MD5加密
public static string MD5Encrypt(string strText)
{
MD5 md5 = new MD5CryptoServiceProvider();
byte[] result = md5.ComputeHash(System.Text.Encoding.Default.GetBytes(strText));
return System.Text.Encoding.Default.GetString(result);
}
private static string GetMD5String(string sign)
{
MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
byte[] encryptedBytes = md5.ComputeHash(Encoding.ASCII.GetBytes(sign));
StringBuilder sb = new StringBuilder();
for (int i = 0; i < encryptedBytes.Length; i++)
{
sb.AppendFormat("{0:x2}", encryptedBytes[i]);
}
return sb.ToString();
}
C# string和byte[]
string类型转成byte[]：
byte[] byteArray = System.Text.Encoding.Default.GetBytes ( str );
byte[]转成string：
string str = System.Text.Encoding.Default.GetString ( byteArray );
总结
以上为个人经验，希望能给大家一个参考，也希望大家多多支持。
