Help Creating XmlNode / XmlAttribute Elegantly
From: David Elliott (Webbert_at_newsgroups.nospam)
Date: 09/02/04
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Date: Thu, 02 Sep 2004 08:52:31 -0400
I am creating a configuration class to read / write a standard configuration file.
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<appSettings>
<add key="ConnectionString" value="server=(local);" />
</appSettings>
</configuration>
I am using a XmlDocument for my base implementation.
I am looking to see if there is a better way to add a new node / attribute than using
XmlDocument.InnerXml. I would consider this to be a hack but couldn't really see another
way of doing this without defining namespaces and the like.
I have included the full file below and the lines that I am wondering about are lines: 79, 227, and 266
Thanks,
Dave
===================================
using System;
using System.Xml;
using System.Text;
namespace Storage.Utility.Configuration
{
/// <summary>
/// Class for Reading / Writing Configuration Options
/// </summary>
public class Configuration
{
#region Data Members
private XmlDocument xmlDoc = null;
private XmlElement root = null;
private XmlNode node = null;
private string filename = null;
private string queryString = null;
#endregion
#region Constructor
public Configuration(string configFileName)
{
filename = configFileName;
}
#endregion
#region Methods
#region Miscellaneous
/// <summary>
/// Initialize the Configuration Class
/// </summary>
private void Initialize()
{
LoadConfiguration();
}
#endregion
#region File Access
/// <summary>
/// Reload the Configuration File
/// </summary>
public void ReloadConfiguration()
{
LoadConfiguration();
}
/// <summary>
/// Save the Configuration File
/// </summary>
public void Save()
{
SaveConfiguration();
}
/// <summary>
/// Load the Configuration File
/// </summary>
private void LoadConfiguration()
{
try
{
xmlDoc = new XmlDocument();
xmlDoc.Load(filename);
}
catch (Exception)
{
// Create Configuration File
xmlDoc.InnerXml = "<?xml version=\"1.0\" encoding=\"utf-8\"?><configuration></configuration>";
}
finally
{
root = xmlDoc.DocumentElement;
}
}
/// <summary>
/// Save the Configuration File
/// </summary>
private void SaveConfiguration()
{
try
{
xmlDoc.Save(filename);
}
catch (Exception ex)
{
// Can't do anything
throw (ex);
}
}
#endregion
#region Retrieve Values
/// <summary>
/// Get the Value of the Key
/// </summary>
/// <param name="section"></param>
/// <param name="key"></param>
/// <returns></returns>
public string GetValue(string section, string key)
{
try
{
// Find the Node
node = GetValueNode(section, key);
if (node != null)
{
// Retrieve Value
XmlNode valueNode = node.Attributes.GetNamedItem("value");
return (valueNode.Value);
}
}
catch (Exception)
{
// Nothing to do
}
// Error Occurred
return (null);
}
/// <summary>
/// Find the Node that the Key belongs to
/// </summary>
/// <param name="section"></param>
/// <param name="key"></param>
/// <returns></returns>
private XmlNode GetValueNode(string section, string key)
{
try
{
// XML Search Path
queryString = "/configuration/" + section + "/add[@key=\"" + key + "\"]";
// Look from the Root of the Document
return (root.SelectSingleNode(queryString));
}
catch (Exception)
{
// Nothing to do
}
// Error Occurred
return (null);
}
#endregion
#region Store Values
/// <summary>
/// Store Key / Value in Configuration File
/// </summary>
/// <param name="section"></param>
/// <param name="key"></param>
/// <param name="keyValue"></param>
/// <returns></returns>
public bool StoreValue(string section, string key, string keyValue)
{
try
{
// Find Node if it exists
node = GetValueNode(section, key);
if (node != null)
{
// Update Value
node = node.Attributes.GetNamedItem("value");
node.Value = keyValue;
return (true);
}
// Node Doesn't Exist -> Get/Create Section -> Add Key / Value
if (GetSection(section) == true)
return (CreateValueNode(section, key, keyValue));
}
catch (Exception)
{
// Nothing to do
}
// Error Occurred
return (false);
}
#endregion
#region Create Nodes
/// <summary>
/// Create New Key / Value Entry
/// </summary>
/// <param name="section"></param>
/// <param name="key"></param>
/// <param name="keyValue"></param>
/// <returns></returns>
private bool CreateValueNode(string section, string key, string keyValue)
{
try
{
// Get Section
queryString = "/configuration/" + section;
node = root.SelectSingleNode(queryString);
// Node Must Exist
if (node != null)
{
// Create and Add New Key / Value Entry
StringBuilder sb = new StringBuilder(500);
sb.Append("<add key=\""); sb.Append(key); sb.Append("\" ");
sb.Append("value=\""); sb.Append(keyValue); sb.Append("\" />");
node.InnerXml += sb.ToString();
return (true);
}
}
catch (Exception)
{
// Nothing to do
}
// Error Occurred
return (false);
}
/// <summary>
/// Get / Create a New Configuration Section
/// </summary>
/// <param name="section"></param>
/// <returns></returns>
private bool GetSection(string section)
{
try
{
// Does the Section Exist
queryString = "/configuration/" + section;
node = root.SelectSingleNode(queryString);
if (node != null)
return (true);
// Get the Configuration Node
queryString = "/configuration";
node = root.SelectSingleNode(queryString);
if (node != null)
{
// Create a New Section
StringBuilder sb = new StringBuilder(1000);
sb.Append("<"); sb.Append(section); sb.Append(">");
sb.Append("</"); sb.Append(section); sb.Append(">");
node.InnerXml += sb.ToString();
return (true);
}
}
catch (Exception)
{
// Nothing to do
}
// Error Occurred
return (false);
}
#endregion
#endregion
} // Class
}
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