一个不错读取Configuration文件的类，方便设置配置文件

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类：Config.cs

using System;

using System.Xml;

using System.Reflection;

using System.Configuration;

using System.Windows.Forms;

namespace XmlConfig

{

public class Config : System.Configuration.AppSettingsReader

{

private XmlNode node;

private string _cfgFile;

public string cfgFile

{

get { return _cfgFile; }

set { _cfgFile= Application.StartupPath + "\\" +
value; }

}

public string GetValue (string key)

{

return Convert.ToString(GetValue(key, typeof(string)));

}

public new object GetValue (string key, System.Type sType)

{

XmlDocument doc = new XmlDocument();

object ro = String.Empty;

loadDoc(doc);

string sNode = key.Substring(0, key.LastIndexOf("//"));

// retrieve the selected node

try

{

node = doc.SelectSingleNode(sNode);

if( node != null )

{

// Xpath selects element that
contains the key

XmlElement targetElem=
(XmlElement)node.SelectSingleNode(key) ;

if (targetElem!=null)

{

ro =
targetElem.GetAttribute("value");

}

}

if (sType == typeof(string))

return Convert.ToString(ro);

else

if (sType == typeof(bool))

{

if (ro.Equals("True") ||
ro.Equals("False"))

return
Convert.ToBoolean(ro);

else

return false;

}

else

if (sType == typeof(int))

return Convert.ToInt32(ro);

else

if (sType == typeof(double))

return Convert.ToDouble(ro);

else

if (sType == typeof(DateTime))

return Convert.ToDateTime(ro);

else

return Convert.ToString(ro);

}

catch

{

return String.Empty;

}

}

public bool SetValue (string key, string val)

{

XmlDocument doc = new XmlDocument();

loadDoc(doc);

try

{

// retrieve the target node

string sNode = key.Substring(0,
key.LastIndexOf("//"));

node = doc.SelectSingleNode(sNode);

if( node == null )

return false;

// Set element that contains the key

XmlElement targetElem= (XmlElement)
node.SelectSingleNode(key);

if (targetElem!=null)

{

// set new value

targetElem.SetAttribute("value",
val);

}

// create new element with
key/value pair and add it

else

{

sNode =
key.Substring(key.LastIndexOf("//")+2);

XmlElement entry =
doc.CreateElement(sNode.Substring(0, sNode.IndexOf("[@")).Trim());

sNode =
sNode.Substring(sNode.IndexOf("'")+1);

entry.SetAttribute("key",
sNode.Substring(0, sNode.IndexOf("'")) );

entry.SetAttribute("value", val);

node.AppendChild(entry);

}

saveDoc(doc, this._cfgFile);

return true;

}

catch

{

return false;

}

}

private void saveDoc (XmlDocument doc, string docPath)

{

// save document

// choose to
ignore if web.config since it may cause server sessions interruptions

if( this._cfgFile.Equals("web.config") )

return;

else

try

{

XmlTextWriter writer = new
XmlTextWriter( docPath , null );

writer.Formatting =
Formatting.Indented;

doc.WriteTo( writer );

writer.Flush();

writer.Close();

return;

}

catch

{}

}

public bool removeElement (string key)

{

XmlDocument doc = new XmlDocument();

loadDoc(doc);

try

{

string sNode = key.Substring(0,
key.LastIndexOf("//"));

// retrieve the appSettings node

node = doc.SelectSingleNode(sNode);

if( node == null )

return false;

// XPath select setting "add" element that contains
this key to remove

XmlNode nd = node.SelectSingleNode(key);

node.RemoveChild(nd);

saveDoc(doc, this._cfgFile);

return true;

}

catch(Exception ex)

{

Console.WriteLine(ex.Message);

return false;

}

}

private void loadDoc ( XmlDocument doc )

{

// check for type of config file being requested

/*

if( this._cfgFile.Equals("app.config"))

{

// use default app.config

this._cfgFile =
((Assembly.GetEntryAssembly()).GetName()).Name+".exe.config";

}

else

if( this._cfgFile.Equals("web.config"))

{

// use server web.config

this._cfgFile =
System.Web.HttpContext.Current.Server.MapPath("web.config");

}

*/

// load the document

doc.Load(this._cfgFile );

}

}

}

使用：

取：

Config config = new Config();
config.cfgFile = "app.config";

txtCountry.Text =
config.GetValue("//appSettings//add[@key='CountryLoc']");

写：

config.SetValue("//appSettings//add[@key='"
+ txtKey.Text + "']", txtValue.Text);

删除：

config.removeElement("//appSettings//add[@key='" +
txtKey2.Text + "']");

详情请参阅：http://www.codeproject.com/csharp/XmlConfig.asp