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.NET Forum / .NET Framework / New Users / December 2004Newbie question: DLLs and Config files
I have used application configuration files with windows and web apps. Now I would like to create a class library and associate a config file with the DLL. This is to support directory changes that will take place in the future. I want to put directory pathnames in the config file and read then from the DLL methods. When I try to use an app.config with class library i have problems. Any suggestions? I'm fairly certain that you cannot use a .config with a .dll. It only works with executables (ie. you can't have mylib.dll.config). You're just going to have to include the configuration settings the executable's configuration file. Joel Martinez http://www.onetug.org - Orlando .NET User Group http://www.codecube.net - blog Alan, What kind of problems are you having? A class library can certainly have a config file and if it is not working for you no one can help you with out knowing what the problem is. cecil Howell MCSD, MCT TY Cecil; I have a class library in which I have some file manipulation and datbase access methods. The objective is to install the library as XP on SQL Server and it is greatly desired to have a config file so as to control some pathnames and control varibales. If I include the Class library with a project (say a win app), I can read read the App.Config file from the the class library without any problems. If I try to use a app.config with class library assembly, then code such as ConfigurationSettings.AppSettings["ErrorLogFile"] no longer returns any values. In fact, an exception is thrown if i try. Is there some way to associate a config file with the class library assembly? I looked at the documentation on customizing assemblies, but it is not clear to me how to associate a config file with the class library assembly. Any help will be appreciated. AlanS > Alan, > What kind of problems are you having? A class library can > certainly have a config file and if it is not working for you no one > can help you with out knowing what the problem is. > cecil Howell MCSD, MCT Alan, Your config file needs to be in the same folder as the dll was loaded from and needs to be named identically to the dll ie dll = util.dll config = util.dll.config I could maybe tell you more but you did not specify what the exception was that was thrown, you need to help us help you! If you are going to post you need to start including specifics about what you are doing and what is going wrong. You will find people will be quicker to help and you will likely solve your problem if you include some details when you post. Cecil Howell MCSD, MCT > TY Cecil; > > I have a class library in which I have some file manipulation and datbase > access methods. The objective is to install the library as XP on SQL Server > and it is greatly desired to have a config file so as to control some > pathnames and control varibales. If I include the Class library with a > project (say a win app), I can read read the App.Config file from the the [quoted text clipped - 6 lines] > assembly? I looked at the documentation on customizing assemblies, but it is > not clear to me how to associate a config file with the class library > assembly. > [quoted text clipped - 7 lines] > > can help you with out knowing what the problem is. > > cecil Howell MCSD, MCT >Your config file needs to be in the same folder as the dll was >loaded from and needs to be named identically to the dll ie dll = >util.dll config = util.dll.config BUT: the .NET System.Configuration.ConfigurationSettings class will *NOT* work on this .config file! You will *NOT* be able to retrieve values from it! The ConfigurationSettings class will *ONLY* work on the app's "MyApp.exe.config" that is calling that particular DLL. If you want to use a config file for your DLL, you'll need to "roll your own" - there's quite a few samples of how to do this on e.g. www.codeproject.com. Marc ================================================================ Marc Scheuner May The Source Be With You! Bern, Switzerland m.scheuner(at)inova.ch > XP on SQL Server and it is greatly desired to have a config file so > as to control some pathnames and control varibales. If I include the If you use the framework config API this data must be in the app's config file or in machine.config. > Class library with a project (say a win app), I can read read the > App.Config file from the the class library without any problems. If That's the intended behaviour. > I try to use a app.config with class library assembly, then code such > as ConfigurationSettings.AppSettings["ErrorLogFile"] no longer > returns any values. In fact, an exception is thrown if i try. Nope. The reason is that the AppDomain is created with the name of the config file, once the AppDomain is created you cannot change the name of the config file. The default name of the config file is <app file name>.config. However, if you create a new AppDomain you can tell it to use any config file you specify, but I don't think that you want to do this! > Is there some way to associate a config file with the class library > assembly? I looked at the documentation on customizing assemblies, > but it is not clear to me how to associate a config file with the > class library assembly. If all you want to do is to control "some pathnames and control varibales" then you could create a class with these as public properties and then use the XmlSerializer class to serialize/deserialize instances of this class to an XML class. If you are doing this, then you store this file in isolated storage if the data is associated with a user, or to the application's folder if the data is not user specific. Richard  Signature.NET training, development, consulting and mentoring www.richardgrimes.com my email evpuneqt@zicf.bet is encrypted with ROT13 (www.rot13.org) Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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