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01.15.2008 at 04:11AM PST, ID: 23083574
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8.0

XPath Queries Using XmlDocument and SelectSingleNode

Asked by SketchySteve in Microsoft Visual C#.Net, Extensible Stylesheet Language Transformation (XSLT), .Net Editors & IDEs

Tags:

Hi guys and thanks for looking,

I have a new project where fixed text can be accessed by either AJAX or a .NET page. I decided to place the text in an XML file to avoid duplication.

Initially I used an int ID and a method "GetErrorMessageById" to retrieve the item of text. This works fine and both the call and the method are shown in the code snippet.

then I decided to use a string value instead using the method GetErrorMessageByFieldId which is alos illustrated below. This is the one I am having an issue with as it wont return any nodes when called.

Please cna some one let me know what i'm doing wrong here and suggest a fix or a work around.

All code and XML below. Start Free Trial 
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public sealed class ProjectSpecific
    {
        public static string GetErrorMessageById(int nMessageID)
        {
            XmlDocument xmlErrorMessages = GetXMLErrorMessagesDocument();
            return xmlErrorMessages.DocumentElement.SelectSingleNode("message[id=" + nMessageID.ToString() + @"]").FirstChild.NextSibling.InnerText;
        }
        public static string GetErrorMessageByFieldId(string strFieldID)
        {
            XmlDocument xmlErrorMessages = GetXMLErrorMessagesDocument();
            return xmlErrorMessages.DocumentElement.SelectSingleNode("message[field_id=" + strFieldID + @"]").FirstChild.NextSibling.InnerText;
        }
 
        private static XmlDocument GetXMLErrorMessagesDocument()
        {
            XmlDocument xmlErrorMessages = new XmlDocument();
 
            if (HttpContext.Current.Cache["ErrorMsg_XML"] != null)
                xmlErrorMessages = (XmlDocument)HttpContext.Current.Cache["ErrorMsg_XML"];
            else
            {
                xmlErrorMessages.Load(HttpContext.Current.Server.MapPath("~/includes/xml/ErrorMessageCopy.xml"));
                HttpContext.Current.Cache["ErrorMsg_XML"] = xmlErrorMessages;
            }
            return xmlErrorMessages;
        }
    }
 
______________________________________________________________
 
 
string str1 = Utils.ProjectSpecific.GetErrorMessageById(1);
 
string str2 = Utils.ProjectSpecific.GetErrorMessageByFieldId("tbForename");
 
<?xml version="1.0" encoding="utf-8" ?>
 
<messages>
  <message>
    <id>0</id>
    <text>You must supply your forename</text>
    <fieldid>tbForename</fieldid>
  </message>
  <message>
    <id>1</id>
    <text>You must supply your surname</text>
    <field_id>tbSurname</field_id>
  </message>
  <message>
    <id>2</id>
    <text>You must supply your home address</text>
    <field_id>tbHomeAddress</field_id>
  </message>
  <message>
    <id>3</id>
    <text>You must supply your mobile number</text>
    <field_id>tbMobileNumber</field_id>
  </message>
  <message>
    <id>4</id>
    <text>You must supply a valid email address</text>
    <field_id>tbEmailAddress</field_id>
  </message>
</messages>
 
Keywords: XPath Queries Using XmlDocument and…
Title
1 xpath...?
2 Xpath, namespaces and equivalents
3 XMLDocument and XPath
4 Find xpath to xml node
5 How do I find attributes using xpath?
6 How do i use XPATH on SOAP string?
 
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[+][-]01.15.2008 at 04:53AM PST, ID: 20662025

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[+][-]01.15.2008 at 04:53AM PST, ID: 20662032

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About this solution

Zones: Microsoft Visual C#.Net, Extensible Stylesheet Language Transformation (XSLT), .Net Editors & IDEs
Tags: C#
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Solution Provided By: existenz2
Participating Experts: 1
Solution Grade: A
 
 
[+][-]01.15.2008 at 05:23AM PST, ID: 20662273

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