AppSettings get value from config file

Question

I m not able to access values in configuration file   Configuration config   ConfigurationManager OpenExeConfiguration ConfigurationUserLevel None   var clientsFilePath   config AppSettings Settings  ClientsFilePath   Value      the second line gets a NullReferenceException    config file    lt  xml version  1 0  encoding  utf-8    gt   lt configuration gt     lt appSettings gt       lt  --     -- gt       lt add key  ClientsFilePath  value  filepath   gt       lt  --     -- gt     lt  appSettings gt   lt  configuration gt    Do you have any suggestion what should I do

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My simple test also failed  following the advice of the other answers here--until I realized that the config file that I added to my desktop application was given the name  App1 config   I renamed it to  App config  and everything immediately worked as it ought

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Coming back to this one after a long time     Given the demise of ConfigurationManager  for anyone still looking for an answer to this try  for example    AppSettingsReader appsettingsreader   new AppSettingsReader    string timeAsString    string  new AppSettingsReader   GetValue  Service Instance Trigger Time   typeof string       Requires System Configuration of course    Editted the code to something that actually works and is simpler to read

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You can simply type    string filePath   Sysem Configuration ConfigurationManager AppSettings key ToString       because key is an object and AppSettings takes a string

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Open  Properties  on your project Go to  Settings  Tab Add  Name  and  Value    CODE WILL BE GENERATED AUTOMATICALLY        lt configuration gt         lt configSections gt           lt sectionGroup name  applicationSettings  type  System Configuration ApplicationSettingsGroup           gt             lt section name  XX    Properties Settings  type  System Configuration ClientSettingsSection            gt           lt  sectionGroup gt         lt  configSections gt         lt applicationSettings gt           lt XX    Properties Settings gt             lt setting name  name  serializeAs  String  gt               lt value gt value lt  value gt             lt  setting gt             lt setting name  name2  serializeAs  String  gt               lt value gt value2 lt  value gt             lt  setting gt          lt  XX    Properties Settings gt         lt  applicationSettings gt       lt  configuration gt     To get a value  Properties Settings Default Name  OR  Properties Settings Default  name

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Read From Config    You ll need to add a reference to Config   Open  Properties  on your project Go to  Settings  Tab Add  Name  and  Value  Get Value with using following code     string value   Properties Settings Default keyname    Save to Config    Properties Settings Default keyName   value  Properties Settings Default Save

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See I did what I thought was the obvious thing was   string filePath   ConfigurationManager AppSettings GetValues  ClientsFilePath   ToString      While that compiles it always returns null   This however  from above  works   string filePath   ConfigurationManager AppSettings  ClientsFilePath

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For web application  i normally will write this method and just call it with the key    private String GetConfigValue String key               return System Web Configuration WebConfigurationManager AppSettings key  ToString

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Give this a go   string filePath   ConfigurationManager AppSettings  ClientsFilePath

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This works for me   string value   System Configuration ConfigurationManager AppSettings key

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Some of the Answers seems a little bit off IMO  Here is my take circa 2016    lt add key  ClientsFilePath  value  filepath   gt    Make sure System Configuration is referenced   Question is asking for value of an appsettings key  Which most certainly SHOULD be     string yourKeyValue   ConfigurationManager AppSettings  ClientsFilePath        yourKeyValue should hold on the HEAP   filepath    Here is a twist in which you can group together values   not for this question   var emails   ConfigurationManager AppSettings ConfigurationManager AppSettings  Environment       Emails      emails will be value of  Environment Key     Emails     example     jack google com thad google com

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In the app web config file set the following configuration    lt configuration gt     lt appSettings gt       lt add key  NameForTheKey  value  ValueForThisKey    gt                          lt  appSettings gt           lt  configuration gt    then you can access this in your code by putting in this line   string myVar   System Configuration ConfigurationManager AppSettings  NameForTheKey       Note that this work fine for  net4 5 x and  net4 6 x  but do not work for  net core   Best regards  Rafael

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Or you can either use  string value   system configuration ConfigurationManager AppSettings Get  ClientsFilePath       Gets the values associated with the specified key from the System Collections Specialized NameValueCollection

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I am using       ExeConfigurationFileMap configMap   new ExeConfigurationFileMap          configMap ExeConfigFilename     d  test justAConfigFile config whateverYouLikeExtension       configMap ExeConfigFilename   AppDomain CurrentDomain BaseDirectory   ServiceConstants FILE SETTING      Configuration config   ConfigurationManager OpenMappedExeConfiguration configMap  ConfigurationUserLevel None       value1   System Configuration ConfigurationManager AppSettings  NewKey0        value2   config AppSettings Settings  NewKey0   Value      value3   ConfigurationManager AppSettings  NewKey0      Where value1       and value3       gives null and value2       works  Then I decided to replace the internal app config with      Note works in service but not in wpf AppDomain CurrentDomain SetData  APP CONFIG FILE     d  test justAConfigFile config whateverYouLikeExtension    ConfigurationManager RefreshSection  appSettings     string value   ConfigurationManager AppSettings  NewKey0      Using VS2012  net 4

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ConfigurationManager RefreshSection  appSettings   string value   System Configuration ConfigurationManager AppSettings key

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The answer that dtsg gave works   string filePath   ConfigurationManager AppSettings  ClientsFilePath      BUT  you need to add an assembly reference to     System Configuration   Go to your Solution Explorer and right click on References and select Add reference  Select the Assemblies tab and search for Configuration     Here is an example of my App config    lt  xml version  1 0  encoding  utf-8    gt   lt configuration gt       lt startup gt            lt supportedRuntime version  v4 0  sku   NETFramework Version v4 5    gt       lt  startup gt     lt appSettings gt       lt add key  AdminName  value  My Name   gt       lt add key  AdminEMail  value  MyEMailAddress   gt     lt  appSettings gt   lt  configuration gt    Which you can get in the following way   string adminName   ConfigurationManager AppSettings  AdminName

[c#] AppSettings get value from .config file

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