How to use a App.config file in WPF applications?

问题:

I created a App.config file in my WPF application:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appsettings>
    <add key="xmlDataDirectory" value="c:\testdata"/>
  </appsettings>
</configuration>

Then I try to read the value out with this:

string xmlDataDirectory = ConfigurationSettings.AppSettings.Get("xmlDataDirectory");

But it says this is obsolete and that I should use ConfigurationManager which I can't find, even searching in the class view.

Does anyone know how to use config files like this in WPF?

回答1:

You have to reference the System.Configuration assembly that is in GAC.

Use of ConfigurationManager is not WPF-specific: it is the privileged way to access configuration information for any type of application.

Please see MSDN for further info

Hope it helps !

Cédric

回答2:

In my case I followed below steps

App.config

<configuration>  
   <startup> 
       <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
  </startup>

 <appSettings>
   <add key="POCPublishSubscribeQueueName" value="FormatName:Direct=OS:localhost\Private$\POCPublishSubscribe"/>
 </appSettings>

</configuration>

Added System.Configuartion to my solution

Added using System.Configuration statement in file at top

Then used below statement

string queuePath = ConfigurationManager.AppSettings["POCPublishSubscribeQueueName"].ToString();

回答3:

In your app.config, change your appsetting to

<applicationSettings>
    <WpfApplication1.Properties.Settings>
        <setting name="appsetting" serializeAs="String">
            <value>c:\testdata.xml</value>
        </setting>
    </WpfApplication1.Properties.Settings>
</applicationSettings>

Then, in the code-behind,

string xmlDataDirectory = WpfApplication1.Properties.Settings.Default.appsetting.ToString()

HTH

回答4:

You have to reference System.Configuration via explorer (not only append using System.Configuration). Then you can write:

string xmlDataDirectory = 
    System.Configuration.ConfigurationManager.AppSettings.Get("xmlDataDirectory");

Tested with VS2010 (thanks to www.developpez.net). Hope this helps.

回答5:

You have to add the reference to System.configuration in your solution. Also, include using System.Configuration;. Once you do that, you'll have access to all the configuration settings.

回答6:

You can change configuration file schema back to DotNetConfig.xsd via properties of the app.config file. To find destination of needed schema, you can search it by name or create a WinForms application, add to project the configuration file and in it's properties, you'll find full path to file.

回答7:

This also works

WpfApplication1.Properties.Settings.Default["appsetting"].ToString()

回答8:

I have a Class Library WPF Project, and I Use:

'Read Settings
Dim value as string = My.Settings.my_key
value = "new value"

'Write Settings
My.Settings.my_key = value
My.Settings.Save()