What is App config in C NET How to use it

Question

I have done a project in C  NET where my database file is an Excel workbook  Since the location of the connection string is hard coded in my coding  there is no problem for installing it in my system  but for other systems there is   Is there a way to prompt the user to set a path once after the setup of the application is completed   The answers I got was  Use App Config     can anyone tell what is this App config and how to use it in my context here

User · Answer

App Config is an XML file that is used as a configuration file for your application  In other words  you store inside it any setting that you may want to change without having to change code  and recompiling   It is often used to store connection strings   See this MSDN article on how to do that

User · Answer

Just adding one more point Using app config some how you can control application access   you want apply particular change to entire application use app config file and you can access the settings like below ConfigurationSettings AppSettings  quot Key quot

User · Answer

Simply  App config is an XML based file format that holds the Application Level Configurations   Example    lt  xml version  1 0   gt   lt configuration gt     lt appSettings gt       lt add key  key  value  test    gt     lt  appSettings gt   lt  configuration gt    You can access the configurations by using ConfigurationManager as shown in the piece of code snippet below   var value   System Configuration ConfigurationManager AppSettings  key       value is now  test    Note  ConfigurationSettings is obsolete method to retrieve configuration information   var value   System Configuration ConfigurationSettings AppSettings  key

User · Answer

At its simplest  the app config is an XML file with many predefined configuration sections available and support for custom configuration sections  A  configuration section  is a snippet of XML with a schema meant to store some type of information    Overview  MSDN  Connection String Configuration  MSDN    Settings can be configured using built-in configuration sections such as connectionStrings or appSettings  You can add your own custom configuration sections  this is an advanced topic  but very powerful for building strongly-typed configuration files   Web applications typically have a web config  while Windows GUI service applications have an app config file   Application-level config files inherit settings from global configuration files  e g  the machine config   Reading from the App Config  Connection strings have a predefined schema that you can use  Note that this small snippet is actually a valid app config  or web config  file    lt  xml version  1 0   gt   lt configuration gt       lt connectionStrings gt              lt add name  MyKey                connectionString  Data Source localhost Initial Catalog ABC                providerName  System Data SqlClient   gt       lt  connectionStrings gt   lt  configuration gt    Once you have defined your app config  you can read it in code using the ConfigurationManager class  Don t be intimidated by the verbose MSDN examples  it s actually quite simple   string connectionString   ConfigurationManager ConnectionStrings  MyKey   ConnectionString    Writing to the App Config  Frequently changing the   config files is usually not a good idea  but it sounds like you only want to perform one-time setup   See  Change connection string  amp  reload app config at run time which describes how to update the connectionStrings section of the   config file at runtime   Note that ideally you would perform such configuration changes from a simple installer   Location of the App Config at Runtime  Q  Suppose I manually change some  lt value gt  in app config  save it and then close it  Now when I go to my bin folder and launch the  exe file from here  why doesn t it reflect the applied changes   A  When you compile an application  its app config is copied to the bin directory1 with a name that matches your exe  For example  if your exe was named  test exe   there should be a  text exe config  in your bin directory  You can change the configuration without a recompile  but you will need to edit the config file that was created at compile time  not the original app config   1  Note that web config files are not moved  but instead stay in the same location at compile and deployment time  One exception to this is when a web config is transformed    NET Core  New configuration options were introduced with  NET Core  The way that   config files works does not appear to have changed  but developers are free to choose new  more flexible configuration paradigms    Configuration in ASP NET Core  Essential  NET - Configuration in  NET Core

User · Answer

You can access keys in the App Config using   ConfigurationSettings AppSettings  KeyName     Take alook at this Thread

User · Answer

Just to add something I was missing from all the answers - even if it seems to be silly and obvious as soon as you know   The file has to be named  App config  or  app config  and can be located in your project at the same level as e g  Program cs   I do not know if other locations are possible  other names  like application conf  as suggested in the ODP net documentation  did not work for me   PS  I started with Visual Studio Code and created a new project with  dotnet new   No configuration file is created in this case  I am sure there are other cases   PPS  You may need to add a nuget package to be able to read the config file  in case of  NET CORE it would be  dotnet add package System Configuration ConfigurationManager --version 4 5 0

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