我有一个用 C# 编写的 Windows 桌面应用程序,它循环访问存储在磁盘上并由第 3 方程序创建的一堆 XML 文件。大多数文件都由以下语句后面的 LINQ 代码成功加载和处理:
XDocument xmlDoc = XDocument.Load(inFileName);
List<DocMetaData> docList =
(from d in xmlDoc.Descendants("DOCUMENT")
select new DocMetaData
{
File = d.Element("FILE").SafeGetAttributeValue("filename")
,
Folder = d.Element("FOLDER").SafeGetAttributeValue("name")
,
ItemID = d.Elements("INDEX")
.Where(i => (string)i.Attribute("name") == "Item ID(idmId)")
.Select(i => (string)i.Attribute("value"))
.FirstOrDefault()
,
Comment = d.Elements("INDEX")
.Where(i => (string)i.Attribute("name") == "Comment(idmComment)")
.Select(i => (string)i.Attribute("value"))
.FirstOrDefault()
,
Title = d.Elements("INDEX")
.Where(i => (string)i.Attribute("name") == "Title(idmName)")
.Select(i => (string)i.Attribute("value"))
.FirstOrDefault()
,
DocClass = d.Elements("INDEX")
.Where(i => (string)i.Attribute("name") == "Document Class(idmDocType)")
.Select(i => (string)i.Attribute("value"))
.FirstOrDefault()
}
).ToList<DocMetaData>();
...其中 inFileName 是完整路径和文件名,例如:
Y:\S2Out\B0000004\Pet Tab\convert.B0000004.Pet Tab.xml
但其中一些文件会导致如下问题:
System.Xml.XmlException: Invalid character in the given encoding. Line 52327, position 126.
at System.Xml.XmlTextReaderImpl.Throw(Exception e)
at System.Xml.XmlTextReaderImpl.Throw(String res, String arg)
at System.Xml.XmlTextReaderImpl.InvalidCharRecovery(Int32& bytesCount, Int32& charsCount)
at System.Xml.XmlTextReaderImpl.GetChars(Int32 maxCharsCount)
at System.Xml.XmlTextReaderImpl.ReadData()
at System.Xml.XmlTextReaderImpl.ParseAttributeValueSlow(Int32 curPos, Char quoteChar, NodeData attr)
at System.Xml.XmlTextReaderImpl.ParseAttributes()
at System.Xml.XmlTextReaderImpl.ParseElement()
at System.Xml.XmlTextReaderImpl.ParseElementContent()
at System.Xml.XmlTextReaderImpl.Read()
at System.Xml.Linq.XContainer.ReadContentFrom(XmlReader r)
at System.Xml.Linq.XContainer.ReadContentFrom(XmlReader r, LoadOptions o)
at System.Xml.Linq.XDocument.Load(XmlReader reader, LoadOptions options)
at System.Xml.Linq.XDocument.Load(String uri, LoadOptions options)
at System.Xml.Linq.XDocument.Load(String uri)
at CBMI.WinFormsUI.GridForm.processFile(StreamWriter oWriter, String inFileName, Int32 XMLfileNumber) in C:\ProjectsVS2010\CBMI.LatitudePostConverter\CBMI.LatitudePostConverter\CBMI.WinFormsUI\GridForm.cs:line 147
at CBMI.WinFormsUI.GridForm.btnProcess_Click(Object sender, EventArgs e) in C:\ProjectsVS2010\CBMI.LatitudePostConverter\CBMI.LatitudePostConverter\CBMI.WinFormsUI\GridForm.cs:line 105
XML 文件如下所示(此示例仅显示 2 个 DOCUMENT 元素,但实际上有很多元素):
<?xml version="1.0" ?>
<DOCUMENTCOLLECTION>
<DOCUMENT>
<FILE filename="e:\S2Out\B0000005\General\D003712420.0001.pdf" outputpath="e:\S2Out\B0000005\General"/>
<ANNOTATION filename=""/>
<INDEX name="Comment(idmComment)" value=""/>
<INDEX name="Document Class(idmDocType)" value="General"/>
<INDEX name="Item ID(idmId)" value="003712420"/>
<INDEX name="Original File Name(idmDocOriginalFile)" value="Matrix Aligning 603.24 Criteria to Petition Pages.pdf"/>
<INDEX name="Title(idmName)" value="Matrix for 603.24"/>
<FOLDER name="/Accreditation/PASBVE/2004-06"/>
</DOCUMENT>
<DOCUMENT>
<FILE filename="e:\S2Out\B0000005\General\D003712442.0001.pdf" outputpath="e:\S2Out\B0000005\General"/>
<ANNOTATION filename=""/>
<INDEX name="Comment(idmComment)" value=""/>
<INDEX name="Document Class(idmDocType)" value="General"/>
<INDEX name="Item ID(idmId)" value="003712442"/>
<INDEX name="Original File Name(idmDocOriginalFile)" value="Contacts at NDU.pdf"/>
<INDEX name="Title(idmName)" value="Contacts at NDU"/>
<FOLDER name="/Accreditation/NDU/2006-12/Self-Study"/>
</DOCUMENT>
LINQ 语句有其自身的复杂性,但我认为它工作正常;这是 LOAD 失败的原因。我查看了 XDocument Load 的各种构造函数,并且研究了引发此异常的其他一些问题,但我对如何防止这种情况感到困惑。
最后,在无法加载的文件中的第 52327 行位置 126,看来第 52327 行上的数据不应导致问题(最后一个字符位于位置 103!
<FILE filename="e:\S2Out\B0000004\Pet Tab\D003710954.0001.pdf" outputpath="e:\S2Out\B0000004\Pet Tab"/>