问题描述
我使用C＃中的序列化和反序列化我的项目（这是一个类）。
他们是序列化并保存到一个XML文件。当加载项目，一切顺利。
I'm using serialization and deserialization in C# for my Project (which is a Class).They are serialized and saved to an XML file. When loading the Project, all goes well.
现在我想带code中的序列化项目为Base64，然后保存文件，该文件顺利了。该文件的第一行（！EN codeD之前）看起来是这样的：
Now I'm trying to encode the serialized Project to Base64 and then save the file, which goes well too. The first line of the file (before encoded!) looks like this:
<?xml version="1.0" encoding="utf-8"?>
<Project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
当我去code中的文件，有一个的 的在该行前面加：
When I decode the file, there's a ? added in front of the line:
?<?xml version="1.0" encoding="utf-8"?>
<Project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
在code我使用EN code：
The code I use to encode:
byte[] toEncodeAsBytes = System.Text.ASCIIEncoding.ASCII.GetBytes(toEncode);
string returnValue = System.Convert.ToBase64String(toEncodeAsBytes);
return returnValue;
而code解码：
And the code for decoding:
byte[] encodedDataAsBytes = System.Convert.FromBase64String(encodedData);
string returnValue = System.Text.ASCIIEncoding.ASCII.GetString(encodedDataAsBytes);
return returnValue;
什么能这样，我该如何解决这一问题？
What can this be and how can I fix this?
推荐答案
文件声明自己为UTF-8 - 那么，为什么您使用的ASCII为en code将其转换成二进制？有以UTF-8字符数不能被重新在ASCII psented $ P $。你甚至要在内存中的文本形式的文件开始？为什么不直接加载它作为二进制数据入手（如 File.ReadAllBytes ）？
The file declares itself as UTF-8 - so why are you using ASCII to encode it into binary? There are many characters in UTF-8 which can't be represented in ASCII. Do you even have to have the file in text form in-memory to start with? Why not just load it as binary data to start with (e.g. File.ReadAllBytes)?
如果您的不的需要开始一个字符串，用 Encoding.UTF-8 （或 Encoding.Uni code ，尽管这可能会导致更大的字节数组），一切都应该罚款。这额外的字符是字节顺序标记 - 它不能重新在ASCII psented $ P $，因而有？替换字符。
If you do need to start with a string, use Encoding.UTF-8 (or Encoding.Unicode, although that will probably result in a bigger byte array) and everything should be fine. That extra character is a byte order mark - which can't be represented in ASCII, hence the "?" replacement character.
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