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This leads to developers having to write complicated configuration file editors or worse, entirely redesigning their original APIs.ДЄs your software matures it is not uncommon for more application configuration types to be added (such as the example I gave you earlier).

Often the configuration options are terse programming terms that only the bravest users dare to change them. In very small applications this might not be a problem but as a programвЂ™s codebase grows the configuration information will often find itself littered throughout the application code.Д¬onfiguration files are usually not written with the end user in mind. However the API for accessing this data is commonly added as an afterthought resulting in an inflexible API. Here are the three major areas where configuration management can be improved:Дevelopers use a configuration file format that gets their application running in the shortest time possible. In a matter of several years the number of configuration data sources grew from one to four! Needless to say getting configuration data often became a grueling task. Then when ASP.NET came along they started to use Web.config. At about the same time another group developed an API that fetched the data from a database. Later on they developed their own ASP configuration class.

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To give a real life scenario I worked for an organization that configured their original programs using the Windows registry API (Application Programming Interface). The advantages of configuration files are that they load quickly, do not take up a lot of space, and are easy to edit.ДЄttempts to create configuration file access schemes do not satisfy the needs of either programmers or end-users.

NET configuration files (aka вЂњ.configвЂќ), the Windows registry, and command line (argv) arguments. Common examples of this are INI files, XML files. Quote:1.1 What is Application Configuration Data?ДЄs a developer you deal with application configuration data all of the time. Is that enough without overcomplicating it ? I could provide an example, but its what makes sense to your program/what you're trying to do that matters Ive seen configuration files used in a 'multiple environment' situation where you have one set of values for a dev system, one set for a test system, and one set for a prod system. Ive had programs that run in an 'automated' sense 'batch processing' that used a configuration file entry to hold the database connection and the program has read all the rest of its information eg file-locations, names, from a database table - this made sense in the 'big insurance world' where I worked, it meant that all reference values could be centrally managed (a downfall of having configuration files scattered around the place).

The 'framework' makes it easy for you to store things like database connections AND encrypt the value to keep it safe in 'configuration files'. In the old days, one had the registry or '.ini' files - one can think of modern configuration files as being an 'extension' of ini files I guess. The basic concept - a configuration file is where you may wish to store/modify some 'value' or set of values that your program needs as input, that you cannot get some other way - so if it were a console/'command-line' program, instead of having the user provide arguments on the command-line, you could read them from 'the configuration file' Re: why use configuration files with DLLs Not sure wether my answer helps, hopefully the author of this snippet will give you his thoughts (all that being said about my particular example, I would probably allow the tcp/ip addresses to be passed into the class/dll and maybe not use the config file.

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I have a class that I use in a couple of programs, that checks 'which instance' (tcp/ip address) MySQL is running on (in case we need to hot-swap a machine) - rather than have the tcp/ip address range as a configuration in the 'mainline' program, I could wrap this class into its own self contained dll and move the configuration to its own config file.Дisadvantages ? : I now have another file (the config) to deployДЄdvantages ? : less coupling of the MySQL search code and the 'mainline code', my MySQL search code can be 'shared' amongst other projects (ie, alluding towards re-use) Then you likely wouldnt be using a configuration fileД«ut, if your dll/assembly encapsulates a 'larger' unit of code that does something 'more', then, I guess it might need configuration data - lets see, an example.

that really depends on what the purpose of your DLL is I guess - if you build a DLL for

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