从字节数组转换为 base64 并返回

问题描述：

我正在尝试:

生成一个字节数组.
将该字节数组转换为 base64
将该 base64 字符串转换回字节数组.

我尝试了一些解决方案，例如在这个问题.

I've tried out a few solutions, for example those in this question.

由于某种原因，初始字节数组和最终字节数组不匹配.这是使用的代码:

For some reason the initial and final byte arrays do not match. Here is the code used:

using (RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider())
    {
         byte[] originalArray = new byte[32];
         rng.GetBytes(key);
         string temp_inBase64 = Convert.ToBase64String(originalArray);
         byte[] temp_backToBytes = Encoding.UTF8.GetBytes(temp_inBase64);
    }

我的问题是:

为什么originalArray"和temp_backToBytes"不匹配?(originalArray 的长度为 32，temp_backToBytes 的长度为 44，但它们的值也不同)

Why do "originalArray" and "temp_backToBytes" not match? (originalArray has length of 32, temp_backToBytes has a length of 44, but their values are also different)

是否可以来回转换，如果可以，我该如何实现?

Is it possible to convert back and forth, and if so, how do I accomplish this?

答

编码数组长约四分之一的原因是 base-64 编码仅使用每个字节中的 6 位；这就是它存在的原因 - 以适合通过纯 ASCII 通道(例如电子邮件)交换的方式对任意数据(可能带有零和其他不可打印字符)进行编码.

The reason the encoded array is longer by about a quarter is that base-64 encoding uses only six bits out of every byte; that is its reason of existence - to encode arbitrary data, possibly with zeros and other non-printable characters, in a way suitable for exchange through ASCII-only channels, such as e-mail.

获取原始数组的方法是使用 Convert.FromBase64String:

The way you get your original array back is by using Convert.FromBase64String:

 byte[] temp_backToBytes = Convert.FromBase64String(temp_inBase64);

从字节数组转换为 base64 并返回

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