用C#实现Base64算法

usingSystem;
usingSystem.Text;

namespaceCommon
{
///<summary>
///实现Base64加密解密
///作者：周公
///时间：2007
///</summary>
publicsealedclassBase64
{
///<summary>
///Base64加密
///</summary>
///<paramname="codeName">加密采用的编码方式</param>
///<paramname="source">待加密的明文</param>
///<returns></returns>
publicstaticstringEncodeBase64(Encodingencode,stringsource)
{
byte[]bytes=encode.GetBytes(source);
try
{
encode=Convert.ToBase64String(bytes);
}
catch
{
encode=source;
}
returnencode;
}

///<summary>
///Base64加密，采用utf8编码方式加密
///</summary>
///<paramname="source">待加密的明文</param>
///<returns>加密后的字符串</returns>
publicstaticstringEncodeBase64(stringsource)
{
returnEncodeBase64(Encoding.UTF8,source);
}

///<summary>
///Base64解密
///</summary>
///<paramname="codeName">解密采用的编码方式，注意和加密时采用的方式一致</param>
///<paramname="result">待解密的密文</param>
///<returns>解密后的字符串</returns>
publicstaticstringDecodeBase64(Encodingencode,stringresult)
{
stringdecode="";
byte[]bytes=Convert.FromBase64String(result);
try
{
decode=encode.GetString(bytes);
}
catch
{
decode=result;
}
returndecode;
}

///<summary>
///Base64解密，采用utf8编码方式解密
///</summary>
///<paramname="result">待解密的密文</param>
///<returns>解密后的字符串</returns>
publicstaticstringDecodeBase64(stringresult)
{
returnDecodeBase64(Encoding.UTF8,result);
}
}
}