xpath - Return value from XPathSelectElement(s) in C# -

-

how to node.expath select element () and node.expathasaccredited elements () Behavior occurs when the selection is a nodeset with nodesets or non-elements? For example, do they always return something or they can throw exceptions? Can return value be empty or is it always an IEnumerable type? The detected XML is stable: 

  & lt; A & gt; & Lt; B c = "d" / & gt; & Lt; E & gt; Fgh & lt; / E & gt; & Lt; E & gt; Xyz & lt; / E & gt; & Lt ;! - Comment -> & Lt; P / & gt; & Lt; / A & gt;

Here are some XPath strings to describe; I would be grateful for the behavior of both XPathSelectElement and XPathSelectElements in each case (I have set the required XSLT nodes below - if you disagree, please comment)

  1. //
  2. //b
  3. // b [1]
  4. // C
  5. // @ c
  6. // b | // @ c
  7. // e / text ()
  8. // comment ()
  9. count (//b)

and expected return value

  1. 1 element
    2. < 1 element
  2. 1 element
  3. 1 element
  4. 1 attribute node
  5. 2 elements and 1 attribute
  6. 2 text nodes
  7. 1 comment node
  8. integer 2

If Xpath elements do not return an IEnumerable (XPathSelectElements) or one single element (XPathSelectElement) is there any signal or failure is silent?

If you evaluate a valid XPath expression for XElements You will get: 

  Linq.XPathSelectElement Linq.XPathSelectElements DOM.SelectSingleNode DOM.SelectNodes ---------- ------------- - ---------------------- "// c" tap .Count == 0 "/ / A" XElement .Count == 1

If you try to match xipeth separately from the exception node type, you will get a invalid operation exponent ; If you are not sure about XPTH return and want to avoid catching exceptions, you can node.xpathEvaluate ()


Comments

Post a Comment

Popular posts from this blog

asp.net - Javascript/DOM Why is does my form not support submit()? -

-
This is my first time working with asp.net and javascript, so I do not know very good web resources, or Much about javascript debugging I have to find out that on line oFormObject.submit (); Microsoft JScript Runtime Error: Object does not support this property or method I am using the link to work as a button because I am terrible in aesthetics and I think That link will look more professional than a table of 50 buttons. I have read that this solution can cause problems with browsers due to pre-rendering of my links and many additional traffic and problems, but CSS gives me a button like a link, which has issues of alignment and difference seemed to. & lt ;! DOCTYPE HTML PUBLIC "- // W3C // DTD HTML 4.01 // N" "http://www.w3.org/TR/html4/strict.dtd"> & Lt; Html xmlns = "http://www.w3.org/1999/xhtml" & gt; & Lt; Head & gt; & Lt; Link rel = "stylesheet" type = "text / css" href = "defect differen
Read more

sockets - Delphi: TTcpServer, connection reset when reading -

-
I am trying to implement one for Delphi, but there are some problems with communication. Fitnesse will start my process, and give me a portmember as a command line argument. Then I should make a socket on the port number given to me, and fitness will connect to that port I am using a TCPCP server for the job: < Pre> TcpServer1.LocalPort: = ParamStr (ParamCount); TcpServer1 Active: = true; On OnEXEPT () -Event, I send the protocol version to use as specified in the protocol. Process TForm1.TcpServer1Accept (From: TOBject; ClientSocket: TCustomIpClient); Var s: ansistring; Start clientSocket. Syndrome ('slim - v 0.0', # 10); SetLength (S, 6); ClientSketts Receavebook (S, 6); End; When I call ReceiveBuf (), the process ends, and fitness throws an exception: java.net.SocketException: connection Reset I have seen what sent and received. It shows that my code sends the protocol version, fitness sends back a message, and when I try to get this message
Read more

javascript - Classic ASP "ExecuteGlobal" statement acting differently on two servers -

-
I have a strange problem that I really do not know. In addition to developing a new ASP.NET site, I have to support the old "classic ASP" site. It is written in VBScript with a batch of JavaScript functions. Many of the JavaScript functions include 'files' Everything is fine on our production system (which security is controlled by another group - this is a military installation) Debugging them once did not work I). However, I have a fix for a vague bug that needs to be fully tested and some functions do not run under the "local" copy of the website that runs on my PC. For the record, I am running IIS 5.1 on XP. The problem is that some Javascript functions are running "OK" on the production server, but when they use it as a server, they are not defined on my PC what is happening that last Programmer, for some reason, has decided to put some functions in a series of files, which according to the observations, imitate the "need_once
Read more