我使用的是通过互联网传输XML文档的第三方DLL。
为什么DLL会抛出以下异常?
根级别的
数据无效。第1行,位置1。(请参阅下面的完整异常文本。)
下面是XML文档的前几行:
<?xml version="1.0" encoding="utf-8"?> <REQUEST> <HEADER>
<REQUESTID>8a5f6d56-d56d-4b7b-b7bf-afcf89cd970d</REQUESTID>
<MESSAGETYPE>101</MESSAGETYPE>
<MESSAGEVERSION>3.0.2</MESSAGEVERSION>
例外:
System.ApplicationException was caught
Message=Unexpected exception.
Source=FooSDK
StackTrace:
at FooSDK.RequestProcessor.Send(String SocketServerAddress, Int32 port)
at Foo.ExecuteRequest(Int32 messageID, IPayload payload, Provider prov)
at Foo.SendOrder(Int32 OrderNo)
InnerException: System.Xml.XmlException
LineNumber=1
LinePosition=1
Message=Data at the root level is invalid. Line 1, position 1.
Source=System.Xml
SourceUri=""
StackTrace:
at System.Xml.XmlTextReaderImpl.Throw(Exception e)
at System.Xml.XmlTextReaderImpl.Throw(String res, String arg)
at System.Xml.XmlTextReaderImpl.ParseRootLevelWhitespace()
at System.Xml.XmlTextReaderImpl.ParseDocumentContent()
at System.Xml.XmlTextReaderImpl.Read()
at System.Xml.XmlLoader.Load(XmlDocument doc, XmlReader reader, Boolean preserveWhitespace)
at System.Xml.XmlDocument.Load(XmlReader reader)
at System.Xml.XmlDocument.LoadXml(String xml)
at XYZ.RequestProcessor.GetObjectFromXML(String xmlResult)
at XYZ.RequestProcessor.Send(String SocketServerAddress, Int32 port)
InnerException:
发布于 2014-07-01 22:51:36
我最终发现有一个字节标记异常,并使用下面的代码删除了它:
string _byteOrderMarkUtf8 = Encoding.UTF8.GetString(Encoding.UTF8.GetPreamble());
if (xml.StartsWith(_byteOrderMarkUtf8))
{
var lastIndexOfUtf8 = _byteOrderMarkUtf8.Length-1;
xml = xml.Remove(0, lastIndexOfUtf8);
}
发布于 2013-07-30 20:48:22
我可以给你两个建议:
发布于 2016-12-08 04:49:33
删除<?xml version="1.0" encoding="utf-8"?>
之前的所有内容
有时,会有一些“不可见”(并非在所有文本编辑器中都可见)。一些程序增加了这个功能。
它叫BOM,你可以在这里阅读更多信息:https://en.wikipedia.org/wiki/Byte_order_mark#Representations_of_byte_order_marks_by_encoding
https://stackoverflow.com/questions/17947238
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