C# 字节数组与Base64编码互转，字符串与Base64编码互转

如需将图片转为base64编码，请先将图片转为byte[] 字节数组，转换方法可参考 C# 图片和字节数组byte[]互转

    /// <summary>
    /// 将字节数组为Base64编码
    /// </summary>
    /// <param name="bytebase">要编码的byte[]</param>
    /// <returns></returns>
    public static string ByteToBase64(byte[] bytebase)
    {
        return Convert.ToBase64String(bytebase);
    }
    /// <summary>
    /// 将Base64字符串转为byte[]
    /// </summary>
    /// <param name="str">Base64字符串</param>
    /// <returns></returns>
    public static byte[] Base64ToByte(string str)
    {
        return Convert.FromBase64String(str);
    }
    /// <summary>
    /// 将字符串转为Base64编码
    /// </summary>
    /// <param name="str">要编码的string字符</param>
    /// <param name="encoding">字符编码方案</param>
    /// <returns></returns>
    public static string StringToBase64(string str, Encoding encoding)
    {
        byte[] buff = encoding.GetBytes(str);
        return Convert.ToBase64String(buff);
    }
    /// <summary>
    /// 将Base64编码解析成字符串
    /// </summary>
    /// <param name="strbase">要解码的string字符</param>
    /// <param name="encoding">字符编码方案</param>
    /// <returns></returns>
    public static string Base64ToString(string strbase, Encoding encoding)
    {
        byte[] buff = Convert.FromBase64String(strbase);
        return encoding.GetString(buff);
    }