转换UTF-8为base64字符串

问题描述：

我尝试 UTF-8 转换为的base64 字符串。

的例如：的我有ABCDEF ==在 UTF-8 。这实际上是一个重新presentationA 的base64 字符串。

Example : I have "abcdef==" in UTF-8. It's in fact a "representation" of a base64 string.

我怎样才能检索ABCDEF ==的base64 字符串（请注意，我不希望有一个ABCDEF ==翻译从 UTF-8 ，我要得到一个字符串连接$ C $光盘的base64 其中的是ABCDEF ==）

How can I retrieve a "abcdef==" base64 string (note that I don't want a "abcdef==" "translation" from UTF-8, I want to get a string encoded in base64 which is "abcdef==")

修改作为我的问题似乎是不清楚，这里是一个改写：

EDIT As my question seems to be unclear, here is a reformulation :

我的字节数组（比方说，我将其命名为A）重新由的base64 字符串psented $ P $。在的base64 转换给了我ABCDEF ==

My byte array (let's say I name it A) is represented by a base64 string. Convert A in base64 gives me "abcdef=="

这串重新presentation是UTF-8通过套接字发送（注意字符串重新presentation正是在UTF-8和BASE64相同）。所以，我收到包含一个UTF-8的消息无论/ ABCDEF == /不管的UTF-8。

This string representation is sent through a socket in UTF-8 (note that the string representation is exactly the same in UTF-8 and base64). So I receive an UTF-8 message which contains "whatever/abcdef==/whatever" in UTF-8.

所以，我需要为了从此套接字消息检索的base64abcedf ==字符串获得一个。

So I need to retrieve the base64 "abcedf==" string from this socket message in order to get A.

我希望这是更清晰！

答

这是一个有点很难说你想什么来实现，但假设你正在试图获得一个Base64字符串时的德codeD 的是 ABCDEF == ，下面应该工作：

It's a little difficult to tell what you're trying to achieve, but assuming you're trying to get a Base64 string that when decoded is abcdef==, the following should work:

var bytes = Encoding.UTF8.GetBytes("abcdef==");
var base64 = Convert.ToBase64String(bytes);
Console.WriteLine(base64);

这将输出： YWJjZGVmPT0 = 是 ABCDEF == 连接为Base64 codeD

This will output: YWJjZGVmPT0= which is abcdef== encoded in Base64.

编辑：

要取消code Base64的字符串，只需使用 Convert.FromBase64String（）。 E.g.L

To decode a Base64 string, simply use Convert.FromBase64String(). E.g.L

var base64 = "YWJjZGVmPT0=";
var data = Convert.FromBase64String(base64);

在这一点上，数据将是字节[] （不是字符串）。如果我们知道字节数组重新presents在UTF8字符串，那么它可以使用转换回字符串形式：

At this point, data will be a byte[] (not a string). If we know that the byte array represents a string in UTF8, then it can be converted back to the string form using:

var str = Encoding.UTF8.GetString(data);
Console.WriteLine(str);

这将输出原始的输入字符串 - ABCDEF == 在这种情况下

This will output the original input string - abcdef== in this case.

转换UTF-8为base64字符串

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