ASP.NET Razor Pages: Create HTML Representing Structure of Xml -
i trying display data in xml(~/server_settings.xml):
<?xml version="1.0" encoding="utf-8"?> <site> <general> <name>venture corp</name> <url>http://anerdsplayground.com/</url> <developer>otard95</developer> </general> <ore_contracts> <use_system description="this system id ore contract app gets prices from">30000142</use_system> </ore_contracts> </site> on site. want give style css , add form input each node has text value, can later edit content.
i want able read new nodes well, file going expand in future. needs read dynamic xml.
i'm using code:
@using system.xml @using system.xml.linq @using system.xml.xpath @functions{ xmldocument doc = null; string output = ""; xmldocument set_doc{ set{ doc = value; } } string write_xml(string path){ // add start tag , attributes node may have output += "<div "; if(doc.selectsinglenode(path).attributes.count > 0){ // description attribute added p tag save later string desc = ""; // loop through attributes foreach(xmlattribute att in doc.selectsinglenode(path).attributes){ if(att.name == "description"){ // if description attribute exists save later desc = att.innertext; }else{ // write attribute output output += att.name + '=' + '"' + att.innertext + '"' + ' '; } } // close starting tag output += ">"; // if node has description attribute add <p> tag if(desc != ""){ output += "<p>" + desc + "</p><br/>"; } } // if current node has 1 or more child nodes execute function each of them if(doc.selectsinglenode(path).haschildnodes){ foreach(xmlnode next_node in doc.selectsinglenode(path).childnodes){ string new_path = path + "/" + next_node.name; // create path next element write_xml(new_path); // write next inner node } // close node output += "</div>"; }else{ // no inner nodes add content of current node , close element output += "<input type=" + '"' + "text" + '"' + " name=" + '"' + "node_content" + '"' + " value=" + '"' + doc.selectsinglenode(path).innertext + '"' + " />"; } return output; } } @{ // xml eve-centeral current ore-prices , creat dictionary xmldocument doc = new xmldocument(); doc.load(server.mappath("~/server_settings.xml")); string root = "/site"; set_doc = doc; } <!doctype html> <html lang="en"> <head> <meta charset="utf-8" /> <title></title> <style> </style> </head> <body> @html.raw(write_xml(root)); </body> </html> but error:
server error in '/' application. expression must evaluate node-set. description: unhandled exception occurred during execution of current web request. please review stack trace more information error , originated in code. exception details: system.xml.xpath.xpathexception: expression must evaluate node-set. source error: line 19: output += "<div "; line 20: line 21: error-->if(doc.selectsinglenode(path).attributes.count > 0){ line 22: // description attribute added p tag save later line 23: string desc = ""; line: 21 stack trace: [xpathexception: expression must evaluate node-set.] ms.internal.xml.xpath.xpathparser.parsenodetest(astnode qyinput, axistype axistype, xpathnodetype nodetype) +5596737 ms.internal.xml.xpath.xpathparser.parsestep(astnode qyinput) +75 ms.internal.xml.xpath.xpathparser.parserelativelocationpath(astnode qyinput) +18 ms.internal.xml.xpath.xpathparser.parselocationpath(astnode qyinput) +118 ms.internal.xml.xpath.xpathparser.parsepathexpr(astnode qyinput) +30 ms.internal.xml.xpath.xpathparser.parseunionexpr(astnode qyinput) +19 ms.internal.xml.xpath.xpathparser.parseunaryexpr(astnode qyinput) +44 ms.internal.xml.xpath.xpathparser.parsemultiplicativeexpr(astnode qyinput) +21 ms.internal.xml.xpath.xpathparser.parseadditiveexpr(astnode qyinput) +21 ms.internal.xml.xpath.xpathparser.parserelationalexpr(astnode qyinput) +21 ms.internal.xml.xpath.xpathparser.parseequalityexpr(astnode qyinput) +21 ms.internal.xml.xpath.xpathparser.parseandexpr(astnode qyinput) +19 ms.internal.xml.xpath.xpathparser.parseorexpr(astnode qyinput) +19 ms.internal.xml.xpath.xpathparser.parseexpresion(astnode qyinput) +30 ms.internal.xml.xpath.xpathparser.parsexpathexpresion(string xpathexpresion) +54 system.xml.xpath.xpathexpression.compile(string xpath, ixmlnamespaceresolver nsresolver) +51 system.xml.xpath.xpathnavigator.select(string xpath) +14 system.xml.xmlnode.selectnodes(string xpath) +45 system.xml.xmlnode.selectsinglenode(string xpath) +7 asp._page_administrative_edit_settings_cshtml.write_xml(string path) in c:\users\otard95\google drive\personal\websites\venturecorpdrive\administrative\edit_settings.cshtml:21 asp._page_administrative_edit_settings_cshtml.write_xml(string path) in c:\users\otard95\google drive\personal\websites\venturecorpdrive\administrative\edit_settings.cshtml:46 asp._page_administrative_edit_settings_cshtml.write_xml(string path) in c:\users\otard95\google drive\personal\websites\venturecorpdrive\administrative\edit_settings.cshtml:46 asp._page_administrative_edit_settings_cshtml.write_xml(string path) in c:\users\otard95\google drive\personal\websites\venturecorpdrive\administrative\edit_settings.cshtml:46 asp._page_administrative_edit_settings_cshtml.execute() in c:\users\otard95\google drive\personal\websites\venturecorpdrive\administrative\edit_settings.cshtml:78 system.web.webpages.webpagebase.executepagehierarchy() +197 system.web.webpages.webpage.executepagehierarchy(ienumerable`1 executors) +68 system.web.webpages.webpage.executepagehierarchy() +151 system.web.webpages.webpagebase.executepagehierarchy(webpagecontext pagecontext, textwriter writer, webpagerenderingbase startpage) +76 system.web.webpages.webpagehttphandler.processrequestinternal(httpcontextbase httpcontext) +114 desired output (example):
<html lang="en"> <body> <div>nodename: <div attributes xml node might have> <p>value of attribute named "description"</p> <form method="post"> <input type="text" name="node_content" value="current content of xml node"/> </form> </div> </div> <div attributes xml node might have> <p>value of attribute named "description"</p> <form method="post"> <input type="text" name="node_content" value="current content of xml node"/> </form> </div> ... </body> </html> i'm quite new system.xml namespace might not best way it. have not found tutorial, choice has been use method of trial , error. if decide reply please explain little. , if have tutorial handy, link maybe, i'd appreciate it.
if missed , need more info, please give me heads-up , i'll edit post can.
thanks in advance might provide!
as @har07 suggested found value of path variable when exception occurs, , got /site/general/name/#text. did not know text content of xmlelement considered childnode
solution:
if(doc.selectsinglenode(path).haschildnodes && doc.selectsinglenode(path).firstchild.gettype().tostring() != "system.xml.xmltext"){ foreach(xmlnode next_node in doc.selectsinglenode(path).childnodes){ string new_path = path + "/" + next_node.name; // create path next element write_xml(new_path); // write next inner node } // close node output += "</div>"; }else{ edit:
added && doc.selectsinglenode(path).firstchild.gettype().tostring() != "system.xml.xmltext" if statement
many @har07
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