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 Base64 decode (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; } } 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
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[] File 2Bytes(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(); } 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
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 ();
}
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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 );