I need to load xml from a file into an XmlDocument. The problem is that the file contains some leading whitespace. (I ha开发者_如何学Pythonve no control over the system that produces the file.) Is there any clean/easy way to ignore or strip those characters?

string SamplelRequestFile = @"C:\example.xml";
XmlDocument docXML = new XmlDocument(); 
XmlTextReader xReader = new XmlTextReader(SamplelRequestFile);
XmlReaderSettings ReaderSettings = new XmlReaderSettings();
ReaderSettings.XmlResolver = null;
ReaderSettings.ProhibitDtd = false;
docXML.Load(xReader);

example.xml (note the leading spaces)

  <?xml version="1.0" ?>
<myRoot>
<someElement />
</myRoot>

You'll just have to do something like

 using (StreamReader sr = new StreamReader(@"C:\example.xml"))
 {
      XmlDocument docXML = new XmlDocument(); 
      docXML.LoadXml(sr.ReadToEnd().Trim());
      ...
 }

here is a sample that works:

        string file = @"C:\example.xml";
        XmlDocument docXML = new XmlDocument();
        using (TextReader x = new StreamReader(file))
        {
            while (x.Peek() == ' ')
                x.Read();
            docXML.Load(x);
        }

This is an invalid XML.

According to XML Specification, pi or processing-instructions must be the first characters if they are present.

I suggest you pre-process the XML by trimming the XML.

Workaround:

string content = File.ReadAllText(@"C:\example.xml");
XmlDocument doc = new XmlDocument();
doc.LoadXml(content.Trim());

Create a Stream and a StreamReader on the file yourself, then Peek() and consume characters from the stream as long as you see whitespace. Once you're sure that the next character is <, pass the stream to the XmlTextReader constructor.

Have you tried adding this flag ?

ReaderSettings.IgnoreWhitespace = true;

string newXml = string.TrimLeft(oldXml);