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Read/Write Configuration in XML file

, 9 Sep 2005
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An article on how to read/write App configuration data in an easy way.

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Introduction

A class with a simple, easy to use interface, is ready to help every one to read/write application configuration in an effective way.

Background

First of all, I don't like ConfigurationSettings provided by the .NET framework, as I can not change the config as I want in the App. I did see many articles on the topic, but either they are too big and complex, get me distracted, or can not meet my requirement. My goal is simple: provide a default setting when first launching the App, and on exit, "remember" the user's preference. Registry is another option, but I prefer XML files, which you can open and check more conveniently.

Using the code

All the settings is set by key/value pairs in an XML file, you can insert/update/delete any key/value. The three major public methods are: GetValue, SetValue, removeElement, it's that simple. By default, the XML file should be put in the same folder as your EXE file.

GetValue, key= "CountryLoc"
Config config = new Config();
config.cfgFile = "app.config"; 

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

I exposed //appSettings in the interface, as you may need access to key/value in different sections. For instance, if you GetValue from key1 in Company section, you can use:

config.GetValue("//Company//add[@key='key1']");

If the section is new, you need to set it up, for example, manually add <Company> </Company> into <configuration>...</configuration>. As in my case, I only have one section, so if you do not like manual thing, you are very welcome to put your code to enhance it. SetValue is quite similar:

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

Remove element:

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

Reference

This article is based on some code I found on the internet which I have forgotten where it is.

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

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About the Author

Michael Chao

Canada Canada
No Biography provided

Comments and Discussions

 
GeneralMy vote of 5 PinmemberMember 78911884-May-11 1:40 
GeneralStill very usefull PinmemberPiet Pelle7-Jun-09 4:55 
GeneralGetting all Keys/Values for a config section PinmemberHeinz Ruebe31-Jul-08 5:22 
Generalmy questions (mabey nothing to do about this article) Pinmembercooleader29-Jul-07 23:19 
GeneralEasier Use Pinmemberfeiry24-Jan-07 15:36 
GeneralJust what I was looking for. PinmemberDavepow162-Dec-05 19:30 
Questionhow about serialization? PinmemberChris_O11-Sep-05 5:52 

try this:
 
Create any config object you like.
Then load and save that object with serialization.
If you have complex objects choose Soap.
For example: (very quick and dirty, but I think it shows how serialization can work...)
 

Imports System.Runtime.Serialization.Formatters.Soap
Imports System.IO
 
public Class MyConfig
 
private m_Value1 as string
private m_Value2 as integer
 
Public Property Value1 () As string
Get
Return m_Value1
End Get
Set(ByVal Value As string)
m_Value1 = Value
End Set
End Property
 
Public Property Value2 () As integer
Get
Return m_Value2
End Get
Set(ByVal Value As integer)
m_Value2 = Value
End Set
End Property
 
end class
 
public class MyApplication
 
private Sub ConfigSerialization()
 
Try
Dim Path As String
Path = Application.StartupPath
Dim oMySoap As New MySoapSerializer
dim oMyConfig as new MyConfig
oMyConfig.Value1 = "test"
oMyConfig.Value1 = 123456
oMySoap.Serialize(oMyConfig, "Config", Path)
Catch ex As ApplicationException
'todo: Ex Handling
MessageBox.Show(ex.Message)
End Try
 
End Sub
 
Private Sub LoadConfig()
 
Dim MySoap As New MySoapSerializer
dim oMyConfig as MyConfig
Dim stemp As String
stemp = Application.StartupPath + "Config.xml"
oMyConfig = MySoap.Deserialize(stemp)
 
End Sub
 
end class
 
Public Class MySoapSerializer
 
Public Sub New()
End Sub
 
Public Sub Serialize(ByVal Obj As Object, ByVal Name As String)
 
Dim S As Stream = File.Create(Name + ".xml")
 
Dim SF As SoapFormatter = New SoapFormatter
SF.Serialize(S, Obj)
S.Close()
 
End Sub
 
Public Function Deserialize(ByVal Name_Path As String) As Object
 
Dim file As FileStream = New FileStream(Name_Path, FileMode.Open)
Dim bf As SoapFormatter = New SoapFormatter
Dim obj As Object = bf.Deserialize(file)
file.Close()
 
Return obj
 
End Function
 
End Class

AnswerThanks for your feedback, it's so interesting Pinmembermichael zhao11-Sep-05 6:47 

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