How to use ConfigurationManager

Question

I want to use App config for storing some setting  I tried to use the next code for getting a parameter from a config file  private string GetSettingValue string paramName        return String Format ConfigurationManager AppSettings paramName       I also added System Configuration for it  I used a separate class   and in App config file I have   lt  xml version  quot 1 0 quot  encoding  quot utf-8 quot    gt   lt configuration gt     lt startup gt        lt supportedRuntime version  quot v4 0 quot  sku  quot  NETFramework Version v4 5 quot    gt     lt  startup gt     lt appSettings gt       lt add key   quot key1 quot  value   quot Sample quot    gt     lt  appSettings gt   lt  configuration gt   But I got an error while trying to use ConfigurationManager - ConfigurationManager can t exist in such context  but I already added System Configuration  Or did I miss something  EDIT  class with config  full view  using System  using System Collections Generic  using System Linq  using System Text  using System Threading Tasks  using System Configuration   namespace browser       class ConfigFile               private string GetSettingValue string paramName                        return String Format ConfigurationManager AppSettings paramName                       EDIT2 Add how it looks  This means the problem is not during using ConfigurationManger but before - the program  quot says quot  that it  quot doesn t know such element quot  as I understand the error - the  quot Element ConfigurationManager quot  doesn t exist in such context quot  EDIT3  EDIT 4

User · Accepted Answer

Okay  it took me a while to see this  but there s no way this compiles   return String  ConfigurationManager AppSettings paramName      You re not even calling a method on the String type  Just do this   return ConfigurationManager AppSettings paramName     The AppSettings KeyValuePair already returns a string  If the name doesn t exist  it will return null     Based on your edit you have not yet added a Reference to the System Configuration assembly for the project you re working in

User · Answer

Go to tools    nuget    console and type   Install-Package System Configuration ConfigurationManager    If you want a specific version   Install-Package System Configuration ConfigurationManager -Version 4 5 0   Your ConfigurationManager dll will now be imported and the code will begin to work

User · Answer

I found some answers  but I don t know if it is the right way This is my solution for now  Fortunatelly it didn  t broke my design mode                  lt summary gt          set config  if key is not in file  create          lt  summary gt           lt param name  key  gt Nome do par  metro lt  param gt           lt param name  value  gt Valor do par  metro lt  param gt      public static void SetConfig string key  string value                var configFile   ConfigurationManager OpenExeConfiguration ConfigurationUserLevel None           var settings   configFile AppSettings Settings          if  settings key     null                        settings Add key  value                     else                       settings key  Value   value                    configFile Save ConfigurationSaveMode Modified           ConfigurationManager RefreshSection configFile AppSettings SectionInformation Name                   lt summary gt          Get key value  if not found  return null          lt  summary gt           lt param name  key  gt  lt  param gt           lt returns gt null if key is not found  else string with value lt  returns gt      public static string GetConfig string key                return ConfigurationManager AppSettings key

[c#] How to use ConfigurationManager

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