从app.config文件中读取

Question

I am trying to read StartingMonthColumn and CategoryHeadingColumn from the below app.config file using the code

ConfigurationSettings.AppSettings["StartingMonthColumn"]

but it is returning null, also ConfigurationSettings.AppSettings.Count returns zero

Please help me to read this in my windows application

<configuration>
    <configSections>
        <sectionGroup name="userSettings" type="System.Configuration.UserSettingsGroup, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
            <section name="CTARepository.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" allowExeDefinition="MachineToLocalUser" requirePermission="false" />
        </sectionGroup>
    </configSections>
    <userSettings>
        <CTARepository.Properties.Settings>
            <setting name="Setting" serializeAs="String">
                <value />
            </setting>
        </CTARepository.Properties.Settings>
    </userSettings>
    <appSettings>
        <add key="StartingMonthColumn" value="7"/>
        <add key="CategoryHeadingColumn" value="1"/>
    </appSettings>
</configuration>

Answer 1

Configuration Settings .AppSettings is obsolete , you should use Configuration Manager .AppSettings instead (you will need to add a reference to System.Configuration )

int value = Int32.Parse(ConfigurationManager.AppSettings["StartingMonthColumn"]);

If you still have problems reading in your app settings then check that your app.config file is named correctly. Specifically, it should be named according to the executing assembly ie MyApp.exe.config , and should reside in the same directory as MyApp.exe .

Answer 2

Just for the future reference, you just need to add System.Configuration to your references library:

Answer 3

ConfigurationSettings.AppSettings is deprecated , see here:

http://msdn.microsoft.com/en-us/library/system.configuration.configurationsettings.appsettings.aspx

That said, it should still work.

Just a suggestion, but have you confirmed that your application configuration is the one your executable is using?

Try attaching a debugger and checking the following value:

AppDomain.CurrentDomain.SetupInformation.ConfigurationFile

And then opening the configuration file and verifying the section is there as you expected.

Answer 4

Try:

string value = ConfigurationManager.AppSettings[key];

For more details check: Reading Keys from App.Config

Answer 5

The reason is simple, your call to ConfigurationSettings.AppSettings is not returning the required config file. Please try any of the following ways:

• Make sure your app config has the same name as your application's exe file - with the extension .config appended eg MyApp.exe.config
• OR you can use ConfigurationManager.OpenExeConfiguration(Assembly.GetExecutingAssembly().Location).AppSettings["StartingMonthColumn"]

Hope this helps

Answer 6

This:

Console.WriteLine( "StartingMonthColumn is {0}", ConfigurationManager.AppSettings["StartingMonthColumn"]);

works fine for me.

Note that ConfigurationManager is in the System.Configuration namespace (so you'll likely want a using System.Configuration; statement), and that since what you read in has a string type you'll need to parse what you read in to use it as a number.

Also, be sure you set system.configuration.dll as a reference in your project or build script.

Answer 7

尝试重建项目 - 它将App.config的内容复制到构建库中的“<YourProjectName.exe> .config”。

Answer 8

还要在运行应用程序的App.config中添加键“StartingMonthColumn”，例如在测试项目的App.config中。