C# string转换为几种不同编码的Byte[]的问题解读

目录C#string转换为几种不同编码的Byte[]1.stringByte[]转换2.Byte[]string转换C#分享几种常用的编码转换，base64、MD5、stringC#Base64编...

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#分享几种常用的编码转换，base64、MD5、string

C# Base64编码

class Base64Helper
{
  /// <suwww.cppcns.commmary>
  /// 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 bwww.cppcns.comyte[] 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我们。