wpf - Get values from App Config file

Question

How to get values from App.Config.

Code:

 <configuration>
  <appSettings>
   <add key="ShowRoomCode" value="1000"/>
   <add key="FolderPath" value="D:\\Images\\Book\\"/>
  </appSettings>
 </configuration>

 string imageFolderPath = ConfigurationManager.AppSettings["FolderPath"];

But it returns null value. Config file is in the Same project.

Answer 1

If you expand the Properties section of Visual Studio and double click the settings section, you will be able to add custom settings which end up like so in the config file:

<configuration>
<configSections>
    <sectionGroup name="userSettings" type="System.Configuration.UserSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
        <section name="WpfApplication1.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" allowExeDefinition="MachineToLocalUser" requirePermission="false" />
    </sectionGroup>
</configSections>
<userSettings>
    <WpfApplication1.Properties.Settings>
        <setting name="FilePath" serializeAs="String">
            <value>Thing</value>
        </setting>
    </WpfApplication1.Properties.Settings>
</userSettings>
</configuration>

Which you can then do this in your code:

string thing = Properties.Settings.Default.FilePath;

Which is nice because it gives you type safety too

Answer 2

The code you wrote should work - make sure you haven't changed 'BuildAction' of the config file.