ASP.NET Razor页面：创建表示Xml结构的HTML(ASP.NET Razor Pages: Create HTML Representing Structure of Xml)

我试图在这个xml（〜/ server_settings.xml）中显示数据：

<?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 is the system id the ore contract app gets its prices from">30000142</use_system> </ore_contracts> </site>

在我的网站上。但是我想给它一些带有css的样式，并为每个具有文本值的节点添加一个带有输入的表单，以便我以后可以编辑内容。

我希望能够读取任何新节点，因为此文件将来会扩展。所以基本上它需要读取动态xml。

我目前正在使用此代码：

@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 and any attributes that this node may have output += "<div "; if(doc.SelectSingleNode(path).Attributes.Count > 0){ // As the description attribute is to be added to a p tag save it for later string desc = ""; // loop through all attributes foreach(XmlAttribute att in doc.SelectSingleNode(path).Attributes){ if(att.Name == "description"){ // If description attribute exists save it for later desc = att.InnerText; }else{ // Write attribute to output output += att.Name + '=' + '"' + att.InnerText + '"' + ' '; } } // Close starting tag output += ">"; // If node has description attribute add to <p> tag if(desc != ""){ output += "<p>" + desc + "</p><br/>"; } } // If current node has one or more child nodes execute this function for 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 for next element write_xml(new_path); // write next inner node } // Close this node output += "</div>"; }else{ // No inner nodes add content of current node and close element output += "<input type=" + '"' + "text" + '"' + " name=" + '"' + "node_content" + '"' + " value=" + '"' + doc.SelectSingleNode(path).InnerText + '"' + " />"; } return output; } } @{ // Get xml from eve-centeral with current ore-prices and 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>

但我得到这个错误：

Server Error in '/' Application. Expression must evaluate to a node-set. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Xml.XPath.XPathException: Expression must evaluate to a node-set. Source Error: Line 19: output += "<div "; Line 20: Line 21: error-->if(doc.SelectSingleNode(path).Attributes.Count > 0){ Line 22: // As the description attribute is to be added to a p tag save it for later Line 23: string desc = ""; Line: 21 Stack Trace: [XPathException: Expression must evaluate to a 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

期望的输出（例子）：

<html lang="en"> <body> <div>NodeName: <div any 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 any 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>

我是System.xml命名空间的新手，所以这可能不是最好的方法。但由于我没有找到一个好的教程，我唯一的选择是使用反复试验的方法。所以如果你决定回复请解释一下。如果你有一个很好的教程，也许一个链接，我会非常感激。

如果我遗漏了任何内容并且你需要更多信息，请给我一个单挑，我会尽快编辑帖子。

提前感谢您提供的任何帮助！

I am trying to display the data in this 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 is the system id the ore contract app gets its prices from">30000142</use_system> </ore_contracts> </site>

on my site. But I want to give it some style with css and add a form with input for each node that has a text value, so that I can later edit the content.

I want to be able to read any new nodes as well, as this file is going to expand in the future. So essentially it needs to read a dynamic xml.

I'm currently using this 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 and any attributes that this node may have output += "<div "; if(doc.SelectSingleNode(path).Attributes.Count > 0){ // As the description attribute is to be added to a p tag save it for later string desc = ""; // loop through all attributes foreach(XmlAttribute att in doc.SelectSingleNode(path).Attributes){ if(att.Name == "description"){ // If description attribute exists save it for later desc = att.InnerText; }else{ // Write attribute to output output += att.Name + '=' + '"' + att.InnerText + '"' + ' '; } } // Close starting tag output += ">"; // If node has description attribute add to <p> tag if(desc != ""){ output += "<p>" + desc + "</p><br/>"; } } // If current node has one or more child nodes execute this function for 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 for next element write_xml(new_path); // write next inner node } // Close this node output += "</div>"; }else{ // No inner nodes add content of current node and close element output += "<input type=" + '"' + "text" + '"' + " name=" + '"' + "node_content" + '"' + " value=" + '"' + doc.SelectSingleNode(path).InnerText + '"' + " />"; } return output; } } @{ // Get xml from eve-centeral with current ore-prices and 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 I get this error:

Server Error in '/' Application. Expression must evaluate to a node-set. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Xml.XPath.XPathException: Expression must evaluate to a node-set. Source Error: Line 19: output += "<div "; Line 20: Line 21: error-->if(doc.SelectSingleNode(path).Attributes.Count > 0){ Line 22: // As the description attribute is to be added to a p tag save it for later Line 23: string desc = ""; Line: 21 Stack Trace: [XPathException: Expression must evaluate to a 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 any 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 any 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 to the System.xml namespace so this might not be the best way to do it. But as I have not found a good tutorial, my only choice has been to use the method of trial and error. So if you do decide to reply please explain a little. And if you have a good tutorial handy, a link maybe, I'd greatly appreciate it.

If I missed anything and you need more info, please give me a heads-up and I'll Edit the post as soon as I can.

Thanks in advance for any help you might provide!

最满意答案

正如@ har07建议我在发生异常时找到path变量的值，并且我得到/site/general/name/#text #text 。我不知道的是， XmlElement的文本内容被认为是ChildNode

解：

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 for next element write_xml(new_path); // write next inner node } // Close this node output += "</div>"; }else{

编辑：

添加&& doc.SelectSingleNode(path).FirstChild.GetType().ToString() != "System.Xml.XmlText"到if语句

非常感谢你@ har07

As @har07 suggested i found the value of the path variable when the exception occurs, and I got /site/general/name/#text. What i did not know was that the text content of a XmlElement was considered a 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 for next element write_xml(new_path); // write next inner node } // Close this node output += "</div>"; }else{

Edit:

Added && doc.SelectSingleNode(path).FirstChild.GetType().ToString() != "System.Xml.XmlText" to if statement

Many thanks to you @har07

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