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Configuration files for Services and Class Libraries
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Florida Coder
I have the need to store some application specific configuration data to be
used by a class library and or a windows service. I would like to do this
in a fashion similar to the way we do with applications and web services
without having to use the machine.config file.

I know that I could use the code below to do this but the problem then
becomes that when using a shared assembly both the assembly and the config
file need to be put in the GAC. I do not want operations to have to GAC
after changes to the config.

Any advice, links or samples would be greatly appreciated. Thank you.

using System;

using System.Reflection;

using System.Collections;

using System.Xml;

using System.Configuration;

// AssemblySettings usage:

//

// If you know the keys you're after, the following is probably

// the most convenient:

//

// AssemblySettings settings = new AssemblySettings();

// string someSetting1 = settings["someKey1"];

// string someSetting2 = settings["someKey2"];

//

// If you want to enumerate over the settings (or just as an

// alternative approach), you can do this too:

//

// IDictionary settings = AssemblySettings.GetConfig();

//

// foreach( DictionaryEntry entry in settings )

// {

// // Use entry.Key or entry.Value as desired...

// }

//

// In either of the above two scenarios, the calling assembly

// (the one that called the constructor or GetConfig) is used

// to determine what file to parse and what the name of the

// settings collection element is. For example, if the calling

// assembly is c:\foo\bar\TestLib.dll, then the configuration file

// that's parsed is c:\foo\bar\TestLib.dll.config, and the

// configuration section that's parsed must be named <assemblySettings>.

//

// To retrieve the configuration information for an arbitrary assembly,

// use the overloaded constructor or GetConfig method that takes an

// Assembly reference as input.

//

// If your assembly is being automatically downloaded from a web

// site by an "href-exe" (an application that's run directly from a link

// on a web page), then the enclosed web.config shows the mechanism

// for allowing the AssemblySettings library to download the

// configuration files you're using for your assemblies (while not

// allowing web.config itself to be downloaded).

//

// If the assembly you are trying to use this with is installed in, and
loaded

// from, the GAC then you'll need to place the config file in the GAC
directory where

// the assembly is installed. On the first release of the CLR, this
directory is

// <windir>\assembly\gac\libName\verNum__pubKeyToken]]>. For example,

// the assembly "SomeLib, Version=1.2.3.4, Culture=neutral,
PublicKeyToken=abcd1234"

// would be installed to the c:\winnt\assembly\gac\SomeLib\1.2.3.4__abcd1234
diretory

// (assuming the OS is installed in c:\winnt). For future versions of the
CLR, this

// directory scheme may change, so you'll need to check the
<code>CodeBase</code> property

// of a GAC-loaded assembly in the debugger to determine the correct
directory location.

//

public class AssemblySettings

{

private IDictionary settings;

public AssemblySettings()

: this(Assembly.GetCallingAssembly())

{

}

public AssemblySettings( Assembly asm )

{

settings = GetConfig(asm);

}

public string this[ string key ]

{

get

{

string settingValue = null;

if( settings != null )

{

settingValue = settings[key] as string;

}

return(settingValue == null ? "" : settingValue);

}

}

public static IDictionary GetConfig()

{

return GetConfig(Assembly.GetCallingAssembly());

}

public static IDictionary GetConfig( Assembly asm )

{

// Open and parse configuration file for specified

// assembly, returning collection to caller for future

// use outside of this class.

//

try

{

string cfgFile = asm.CodeBase + ".config";

const string nodeName = "assemblySettings";

XmlDocument doc = new XmlDocument();

doc.Load(new XmlTextReader(cfgFile));

XmlNodeList nodes = doc.GetElementsByTagName(nodeName);

foreach( XmlNode node in nodes )

{

if( node.LocalName == nodeName )

{

DictionarySectionHandler handler = new
DictionarySectionHandler();

return (IDictionary)handler.Create(null, null, node);

}

}

}

catch (Exception e)

{

Console.WriteLine ("Error: " + e.Message);

}

return(null);

}

}
Reply to this message...
 
    
Nicholas Paldino [.NET/C# MVP] (VIP)
Florida,

Quite simply, you can not do what you want. With Services, you can,
because they are the managed entry point for an application. However, for
class libraries, since they are loaded by an application, they are subject
to the configuration of that application.

Basically, if your class libraries have configuration options that need
to be set, you need to retrieve them separately from a well known location.
Either that, or you should depend on the settings being in the configuration
of the application, defaulting to something else if they are not available.

Hope this helps.

--
- Nicholas Paldino [.NET/C# MVP]
- Click here to reveal e-mail address

"Florida Coder" <Click here to reveal e-mail address> wrote in message
news:Click here to reveal e-mail address...
[Original message clipped]
Reply to this message...
 
    
Richard Blewett [DevelopMentor] (VIP)
Mike Woodring wrote someting that does what you're after. Check out:

http://www.bearcanyon.com/dotnet/#AssemblySettings

Regards

Richard Blewett - DevelopMentor

http://staff.develop.com/richardb/weblog

nntp://news.microsoft.com/microsoft.public.dotnet.languages.csharp/<Click here to reveal e-mail address>

Florida,

Quite simply, you can not do what you want. With Services, you can,
because they are the managed entry point for an application. However, for
class libraries, since they are loaded by an application, they are subject
to the configuration of that application.

Basically, if your class libraries have configuration options that need
to be set, you need to retrieve them separately from a well known location.
Either that, or you should depend on the settings being in the configuration
of the application, defaulting to something else if they are not available.

Hope this helps.

--
- Nicholas Paldino [.NET/C# MVP]
- Click here to reveal e-mail address

"Florida Coder" <Click here to reveal e-mail address> wrote in message
news:Click here to reveal e-mail address...
[Original message clipped]

---
Incoming mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.760 / Virus Database: 509 - Release Date: 10/09/2004

[microsoft.public.dotnet.languages.csharp]
Reply to this message...
 
    
Florida Coder
Saw that and included it in my post. The problem with it is that I would
need to GAC the config file as well and I was hoping to avoid that. Thank
you.

"Richard Blewett [DevelopMentor]" <Click here to reveal e-mail address> wrote in message
news:%Click here to reveal e-mail address...
[Original message clipped]
Reply to this message...
 
 
System.Collections.DictionaryEntry
System.Collections.IDictionary
System.Configuration.DictionarySectionHandler
System.Console
System.Reflection.Assembly
System.Xml.XmlDocument
System.Xml.XmlNode
System.Xml.XmlNodeList
System.Xml.XmlTextReader




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