linq-to-xml | 易学教程

Parsing a string in c#

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问题 Suppose there is an xml file like below: <Instances> <Bits = "16" XCoord = "64" YCoord = "64" ZCoord = "64" FileType="jpeg" Location="C:\Series1\Image1.jpg" ImageNumber = "1"/> <Bits = "16" XCoord = "64" YCoord = "64" ZCoord = "64" FileType="jpeg" Location="C:\Series1\Image2.jpg" ImageNumber = "2"/> <Bits = "16" XCoord = "64" YCoord = "64" ZCoord = "64" FileType="jpeg" Location="C:\Series1\Image3.jpg" ImageNumber = "3"/> <Bits = "16" XCoord = "64" YCoord = "64" ZCoord = "64" FileType="jpeg"

Disposing an XDocument object

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问题 How do I "dispose" an XDocument object? I am using it to parse an XML string and then save the file to the file system. In the same method I then need to access this file and run a command line tool on it. The code is as follows: string filepath = "..."; string filename = "..."; XDocument xdoc = XDocument.Parse(xmlString); xdoc.Save(filepath + filename); Process p = Process.Start(new ProcessStartInfo("rst.exe", args)); // the args use the file saved above I put a breakpoint on the line where

XDocument to string: How to omit encoding in declaration?

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问题 I'm writing a wrapper for a braindead enterprise XML API. I have an XDocument that I need to turn into a string. Due to the fact that their XML parser is so finicky that it cannot even handle whitespace between XML nodes, the document declaration MUST be EXACTLY: <?xml version="1.0"?> However, the XDocument.Save() method always adds an encoding attribute in that declaration: <?xml version="1.0" encoding="utf-16"?> With the past hour spent on Google and Stack looking for the best way to

Force XDocument to not use namespace prefix if namespace is also defined as default

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问题 I have an xml file with default namespace specified with and without namespace prefix. When I generate xml output I'm getting all xml elements prefixed. Is there way to get rid of the prefixes since I'm using the default namespace? class Program { static void Main(string[] args) { var xml = "<root xmlns='default-namespace' xmlns:key='default-namespace'>" + " <node1></node1>" + " <node2></node2>" + "</root>"; var document = XDocument.Parse(xml); var output = document.ToString(); } } The output

Performance: XmlSerializer vs XmlReader vs XmlDocument vs XDocument

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问题 I'm working on a little web project and would like to read/write to an XML file. Performance is my first priority. I've come to this great post on comparing the mentioned approaches except XmlSerializer . I prefer XmlSerializer since it makes the code much cleaner. But I don't know about its performance. What kind does XmlSerializer use inside to write to XML files? 回答1: As for the performance of XmlSerializer, see http://msdn.microsoft.com/en-us/library/182eeyhh.aspx which says: The

Parsing HTML document: Regular expression or LINQ?

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问题 Trying to parse an HTML document and extract some elements (any links to text files). The current strategy is to load an HTML document into a string. Then find all instances of links to text files. It could be any file type, but for this question, it's a text file. The end goal is to have an IEnumerable list of string objects. That part is easy, but parsing the data is the question. <html> <head><title>Blah</title> </head> <body> <br/> <div>Here is your first text file: <a href="http:/

Is there a way to serialize multiple XElements onto the same line?

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问题 I'm dealing with the dreaded <Run/> in Silverlight 3 and having to programmatically create a <TextBlock> and its inlines: Why dreaded? Because it doesn't work, I guess, the way you'd expect. Exhibit A, below, should produce BARN (with fancy colors for each character), but instead it produces: B A R N EXHIBIT A <TextBlock FontFamily="Comic Sans MS" FontSize="88"> <Run Foreground="#A200FF">B</Run> <Run Foreground="#FF0000">A</Run> <Run Foreground="#FFC000">R</Run> <Run Foreground="#FFFF00">N<

Is there a way to serialize multiple XElements onto the same line?

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How do I add an XElement to a document, avoiding the “incorrectly structured document” error?

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问题 // Remove element with ID of 1 var userIds = from user in document.Descendants("Id") where user.Value == "1" select user; userIds.Remove(); SaveAndDisplay(document); // Add element back var newElement = new XElement("Id", "0", new XElement("Balance", "3000")); document.Add(newElement); SaveAndDisplay(document); The add element back block is the problem. As when it gets to the add it states: This operation would create an incorrectly structured document. What stupid mistake am I making? Edit:

VB.NET XML Literal Expression Expected with Linq to XML

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问题 I have the same problem as stated in this question, but the accepted solution there was a "works on my machine" answer. Here is my code: Dim document As XDocument = _ <?xml version="1.0" encoding="utf-8"?> <soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://www.w3.org/2003/05/soap-envelope"> <soap12:Body> <GetUser xmlns="http://foo.com/bar.asmx"> <encryptedHash>HashString</encryptedHash> <accessKey