为什么是 ASCII.获取字节返回错误的字节
本文关键字:字节 返回 错误 获取 ASCII 为什么 | 更新日期: 2023-09-27 18:37:20
我创建一个类并将其转换为xml。
问题是当我将类 xml 字符串转换为字节
时ASCII.GetBytes
返回一个字节数组ascArray
开头的额外角色
它总是一个 ? 字符,所以 xml 像这样开始
?<?xml version="1.0" encoding="utf-8"?>
为什么会这样?
这是代码:
WorkItem p = new WorkItem();
// Fill the class with whatever need to be sent to client
OneItem posts1 = new OneItem();
posts1.id = "id 1";
posts1.username = "hasse";
posts1.message = "hej again";
posts1.time = "time1";
p.setPost(posts1);
OneItem posts2 = new OneItem();
posts2.id = "id 2";
posts2.username = "bella";
posts2.message = "hej again again";
posts2.time = "time2";
p.setPost(posts2);
// convert the class WorkItem to xml
MemoryStream memoryStream = new MemoryStream();
XmlSerializer xs = new XmlSerializer(typeof(WorkItem));
XmlTextWriter xmlTextWriter = new XmlTextWriter(memoryStream, Encoding.UTF8);
xs.Serialize(xmlTextWriter, p);
// send the xml version of WorkItem to client
byte[] data = memoryStream.ToArray();
clientStream.Write(data, 0, data.Length);
Console.WriteLine(" send.." + data);
clientStream.Close();
我强烈怀疑数据以字节顺序标记开头,无法用 ASCII 表示。
目前尚不清楚您为什么要做您正在做的事情,尤其是在MemoryStream
周围。为什么要创建一个 UTF-8 编码的字节数组,然后将其解码为字符串(我们不知道UTF8ByteArrayToString
做什么),然后将其转换回字节数组?为什么不直接将字节数组写入客户端呢?如果您需要将数据作为字符串,我会使用 StringWriter
的子类,该子类通告它使用 UTF-8 作为编码。如果你不需要它作为字符串,只需坚持使用字节数组。
请注意,即使除了第一个字符之外,您有一个以 UTF-8 编码的 XML 文档这一事实也意味着字符串中很可能还有其他非 ASCII 字符。你为什么在这里使用ASCII?
编辑:需要明确的是,您从根本上应用了有损转换,并且不必要地这样做。即使你想要数据的本地副本,你也应该有这样的东西:
// Removed bad try/catch block - don't just catch Exception, and don't
// just swallow exceptions
MemoryStream memoryStream = new MemoryStream();
XmlSerializer xs = new XmlSerializer(typeof(WorkItem));
XmlTextWriter xmlTextWriter = new XmlTextWriter(memoryStream, Encoding.UTF8);
xs.Serialize(xmlTextWriter, p);
// Removed pointless conversion to/from string
// Removed pointless BinaryWriter (just use the stream)
// An alternative would be memoryStream.WriteTo(clientStream);
byte[] data = memoryStream.ToArray();
clientStream.Write(data, 0, data.Length);
Console.WriteLine(" send.." + data);
// Removed Close calls - you should use "using" statements to dispose of
// streams automatically.