I&#39;ve got some questions about two ways to save settings in the web.config.

***Appsettings***:
Look in web.config

&lt;!-- language: lang-xml --&gt;

    &lt;appSettings&gt;
     &lt;add key=&quot;key1&quot; value=&quot;value1&quot;/&gt;
     &lt;add key=&quot;key2&quot; value=&quot;value2&quot;/&gt;
    &lt;/appSettings&gt;

**Usage in code-behind**:

    ConfigurationManager.AppSettings[&quot;key1&quot;];

***ApplicationSettings/ Properties*** (autogenerated by using the &#39;properties&#39;-tab in the project)  
**Look in web.config**

&lt;!-- language: lang-xml --&gt;

    &lt;applicationSettings&gt;
        &lt;Projectname.Properties.Settings&gt;
            &lt;setting name=&quot;TestEnvironment&quot; serializeAs=&quot;String&quot;&gt;
                &lt;value&gt;True&lt;/value&gt;
            &lt;/setting&gt;
        &lt;/Projectname.Properties.Settings&gt;
    &lt;/applicationSettings&gt;

**Usage in code-behind**:

    Properties.Settings.Default.TestEnvironment


So, what&#39;s the difference between these two storage possibilities of settings in the web.config?  
As far as I can see, a downside of the appSettings is that you have modify the web.config yourself and the appSettings are not strong typed, where as the applicationSettings are.

Both are replaceable within a web deployment project.


As far as I am concerned, there is **no use for appSettings**. Am I missing something here? Which is the historically seen older one?

appSettings vs applicationSettings. appSettings outdated?

I have to get the current country in the iPhone settings. Can anyone tell me how to get the current country in iPhone application.

I have to use the current country for parsing the RSS feed in which I need to pass the current country. 

Please help me out to find the country .

Thanks in advance.

Find current country from iPhone device

I cannot seem to figure out how to read values from the appsettings.json in my _Layout.chtml file.

Is it not just available, something like this?
@Configuration[&quot;ApplicationInsights:InstrumentationKey&quot;]

I created a new MVC project using razor pages.

fyi, i&#39;m an mvc newbee - code samples help a lot.


How to read appsettings.json in my _layout.chtml

I want to create 3 AppSettings config files:

- Database.config
- Messages.config
- Global.config

And after add in my App.config:

    &lt;appSettings file=&quot;Database.config&quot; /&gt;
    &lt;appSettings file=&quot;Messages.config&quot; /&gt;
    &lt;appSettings file=&quot;Global.config&quot; /&gt;

But when I try to access a key that there is in one of three files with the `ConfigurationManager`, I got the following error: 

&gt;Configuration system failed to initialize. Sections must only appear once per config file.

I cannot have more than one AppSettings config file? 

Multiple AppSettings files, is it possible?

Not sure what am I missing here but I am not able to get the values from my appsettings.json in my .net core application. I have my appsettings.json as:

&lt;!-- language: lang-json --&gt;

    {
        &quot;AppSettings&quot;: {
            &quot;Version&quot;: &quot;One&quot;
        }
    }

Startup:

    public class Startup
    {
        private IConfigurationRoot _configuration;
        public Startup(IHostingEnvironment env)
        {
            _configuration = new ConfigurationBuilder()
        }
        public void ConfigureServices(IServiceCollection services)
        {
          //Here I setup to read appsettings        
          services.Configure&lt;AppSettings&gt;(_configuration.GetSection(&quot;AppSettings&quot;));
        }
    }

Model:
    
    public class AppSettings
    {
        public string Version{ get; set; }
    }

Controller:

    public class HomeController : Controller
    {
        private readonly AppSettings _mySettings;

        public HomeController(IOptions&lt;AppSettings&gt; settings)
        {
            //This is always null
            _mySettings = settings.Value;
        }
    }


`_mySettings` is always null. Is there something that I am missing here?


Getting value from appsettings.json in .net core

Okay, I know that there are many question about it, but they are all from many time ago.

So. I know that it is possible because the Map app does it.

In the Map app if I turn off the localization for this app, it send me a message, and if I press okay, the &quot;Settings App&quot; will be open.
And my question is, how is this possible?
How can I open the &quot;Setting app&quot; from my own app?

Basically I need to do the same thing, if the user turn off the location for my app, then I&#39;ll show him a message saying something that will open the &quot;Setting app&quot;

Opening the Settings app from another app

I&#39;m working on a C# class library that needs to be able to read settings from the `web.config` or `app.config` file (depending on whether the DLL is referenced from an ASP.NET web application or a Windows Forms application).

I&#39;ve found that

    ConfigurationSettings.AppSettings.Get(&quot;MySetting&quot;)

works, but that code has been marked as deprecated by Microsoft.

I&#39;ve read that I should be using:

    ConfigurationManager.AppSettings[&quot;MySetting&quot;]

However, the `System.Configuration.ConfigurationManager` class doesn&#39;t seem to be available from a C# Class Library project.

What is the best way to do this?


Reading settings from app.config or web.config in .NET

I&#39;m not able to access values in configuration file.

    Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
    var clientsFilePath = config.AppSettings.Settings[&quot;ClientsFilePath&quot;].Value; 
    // the second line gets a NullReferenceException

**.config file**:

&lt;!-- language: lang-xml --&gt;

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot; ?&gt;
    &lt;configuration&gt;
      &lt;appSettings&gt;
        &lt;!-- ... --&gt;
        &lt;add key=&quot;ClientsFilePath&quot; value=&quot;filepath&quot;/&gt;
        &lt;!-- ... --&gt;
      &lt;/appSettings&gt;
    &lt;/configuration&gt;

Do you have any suggestion what should I do?

AppSettings get value from .config file

I&#39;ve defined some values in my `appsettings.json` for things like database connection strings, webapi locations and the like which are different for development, staging and live environments.

Is there a way to have multiple `appsettings.json` files (like `appsettings.live.json`, etc, etc) and have the asp.net app just &#39;know&#39; which one to use based on the build configuration it&#39;s running?

Automatically set appsettings.json for dev and release environments in asp.net core?

How do I check to see if an Application Setting is available?  

i.e. app.config

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot; ?&gt;
    &lt;configuration&gt;
      &lt;appSettings&gt;
        &lt;add key =&quot;someKey&quot; value=&quot;someValue&quot;/&gt;
      &lt;/appSettings&gt;
    &lt;/configuration&gt;

and in the codefile

    if (ConfigurationManager.AppSettings.ContainsKey(&quot;someKey&quot;))
    {
      // Do Something
    }else{
      // Do Something Else
    }


How to check if an appSettings key exists?

My Web application needs to read the Document DB keys from appsettings.json file. I have created a class with the key names and reading the Config section in `ConfigureServices()` as:

    public Startup(IHostingEnvironment env) {
        var builder = new ConfigurationBuilder()
            .AddJsonFile(&quot;appsettings.json&quot;, optional: true, reloadOnChange: true)
            .AddEnvironmentVariables();

        Configuration = builder.Build();
    }

    public IConfigurationRoot Configuration { get; }

    public void ConfigureServices(IServiceCollection services) {
        services.AddMvc().AddJsonOptions(options =&gt; options.SerializerSettings.ContractResolver = new DefaultContractResolver());
        services.AddSession();
        Helpers.GetConfigurationSettings(services, Configuration);
        DIBuilder.AddDependency(services, Configuration);
    }

I&#39;m looking for the ways to read the Key values in Test project.



Read appsettings json values in .NET Core Test Project

It might sound too trival to ask and I do the same thing as suggested in articles, yet it doesn&#39;t work as expected. Hope someone can point me to the right direction.

I would like to save the usersettings per AppSettings.

Once the Winform is closed I trigger this:


    conf.Configuration config = 
               ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
        
    if (ConfigurationManager.AppSettings[&quot;IntegrateWithPerforce&quot;] != null)
        ConfigurationManager.AppSettings[&quot;IntegrateWithPerforce&quot;] = 
                                               e.Payload.IntegrateCheckBox.ToString();
    else
        config.AppSettings.Settings.Add(&quot;IntegrateWithPerforce&quot;, 
                                              e.Payload.IntegrateCheckBox.ToString());
    
    config.Save(ConfigurationSaveMode.Modified);


So the first time when the entry doesnt exist yet, it would simply create it, otherwise it would modify the existing entry.  However this doesn&#39;t save.

1) What am I doing wrong?

2) Where am I expecting the usersettings for App settings to be saved again? Is it in the Debug folder or in C:\Documents and Settings\USERNAME\Local Settings\Application Data folder?

ConfigurationManager.AppSettings - How to modify and save?

I have the following class in NET Core2.0 App.

    // required when local database does not exist or was deleted
    public class ToDoContextFactory : IDesignTimeDbContextFactory&lt;AppContext&gt;
    {
        public AppContext CreateDbContext(string[] args)
        {
            var builder = new DbContextOptionsBuilder&lt;AppContext&gt;();
            builder.UseSqlServer(&quot;Server=localhost;Database=DbName;Trusted_Connection=True;MultipleActiveResultSets=true&quot;);
            return new AppContext(builder.Options);
        }
    }

This is required in Core 2.0 with migration when Database does not exist and has to be created when you run *update-database*.&lt;br&gt;
[https://stackoverflow.com/questions/45782446/unable-to-create-migrations-after-upgrading-to-asp-net-core-2-0][1]

I would like not having ConnectionString in 2 places(here and in appsettings.json) but only in .json
so I have tried to replace

    &quot;Server=localhost;Database=DbName;Trusted_Connection=True;MultipleActiveResultSets=true&quot;

with

    ConfigurationManager.ConnectionStrings[&quot;DefaultConnection&quot;].ConnectionString

but it&#39;s not working, I&#39;m getting null value.

UPDATE 1:&lt;br&gt;
Just to note that adding explicitly .json is not necessery in Core 2 so the problem is not with the file.&lt;br&gt;
[https://andrewlock.net/exploring-program-and-startup-in-asp-net-core-2-preview1-2/][2]&lt;br&gt;
&lt;br&gt;
UPDATE 2:&lt;br&gt;
Also I am already using Configuration for sending ConnectionString from .json to Context:

    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }
    
        public IConfiguration Configuration { get; }
    
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddDbContext&lt;AppContext&gt;(options =&gt; options.UseSqlServer(Configuration.GetConnectionString(&quot;DefaultConnection&quot;)));
        }
    }

But I can not use this for *ToDoContextFactory* because it does not have Configuration, and *ToDoContextFactory* is used by migrations so the App is not running at all.&lt;br&gt;

SOLUTION:
Based on answer from @JRB I made it work like this:

    public AppContext CreateDbContext(string[] args)
    {
        string projectPath = AppDomain.CurrentDomain.BaseDirectory.Split(new String[] { @&quot;bin\&quot; }, StringSplitOptions.None)[0];
        IConfigurationRoot configuration = new ConfigurationBuilder()
            .SetBasePath(projectPath)
            .AddJsonFile(&quot;appsettings.json&quot;)
            .Build();
        string connectionString = configuration.GetConnectionString(&quot;DefaultConnection&quot;);
    
        var builder = new DbContextOptionsBuilder&lt;AppContext&gt;();
        builder.UseSqlServer(connectionString);
        
        return new AppContext(builder.Options);
    }


  [1]: https://stackoverflow.com/questions/45782446/unable-to-create-migrations-after-upgrading-to-asp-net-core-2-0
  [2]: https://andrewlock.net/exploring-program-and-startup-in-asp-net-core-2-preview1-2/

Get ConnectionString from appsettings.json instead of being hardcoded in .NET Core 2.0 App

In WPF, Can I use binding with values defined in Settings? If this is possible, please provide a sample.

Bind to a value defined in the Settings

**My question:**

How can my iPhone-app tell the iOS, that the user did select a language in the apps preferences, that is different from the language set in the general settings?

*Other formulation of the same question:*

How can i tell the system, that `NSLocalizedString (@&quot;text&quot;, @&quot;comment&quot;);` should not access the systemwide selected language, but the in-app-selected language?

**background, example:**

Please take this situation as an example:
A son of german immigrants is living in the north-east of France next to Luxemburg and Germany. His native language is French, so he did set the user-interfaces language of his iPhone to French (Settings → General → International → Language → Fran&#231;ais). But due to his cultural background and because the region where he is living is bilingual, he also speaks German very well. But he doesn&#39;t speak ten words of English. On an iPhone (and iPad as well) he has no chance to select a second language, so the phone only knows that he spreaks french. It has no knowledge of the users skills in other languages.

Now comes my app: I did develop it in English and German (German is my native language and English is standard-language in IT). I did develop it according to all rules and best practices for mulilingual iOS-Apps. &quot;First&quot; Language (default language) of my app is English.

*This means:*

If somebody has chosen English or German in his Settings, the apps user-interface automatically will use the selected language. The user will not even notice that there are other languages available.

But if he did select any other language (like Chinese, Polish or French) in the general settings, he will get the apps default-language, which, in my case, is English. But for my french-german friend this is not the best choice. He would like to use the existing german version, but there seems to be no way to let the user select this version.

Adding a french translation would solve the problem for our french-german friend, but not for people speaking two other languages (such as italian and german), and I can not support my app with all languages spoken on this planet.
Setting the default-language to German is also not optimal, because this would rise the same problem for people speaking french (as native language) and English (as second language).

So I think my app must have the possibility to manually select a language that is different from the pre-selected language. Adding a language-selection to the apps settings-panel ist not the problem. But how can i tell the system, that `NSLocalizedString (@&quot;text&quot;, @&quot;comment&quot;);` should not access the systemwide selected language, but the in-app-selected language?

manual language selection in an iOS-App (iPhone and iPad)


    public class Bar
    {
        public static readonly string Foo = ConfigurationManager.AppSettings[&quot;Foo&quot;];
    }

In the .NET Framework 4.x, I can use the `ConfigurationManager.AppSettings [&quot;Foo&quot;]` to get `Foo` in `Webconfig`,and then I can easily get the value of `Foo` through `Bar.Foo`

But in .Net core, I mustto inject `options`, And can not get the value of `Foo `through `Bar.Foo`

Is there a method, which can be directly through the `Bar.Foo` to get the value of  `Foo`?



how to get value from appsettings.json

I am actually in the learning phase of .NET related stuff and I was exploring how to save the application. I ended up writing my own class which saves the settings in an XML file and then I found that .NET itself supports saving application settings.

But I found 2 ways to do that. When I open add new item dialog in Visual Studio 2008, it gives  option to create Settings file (.settings) or a configuration file (.config). Whats the difference between both and in what scenario they should be used?

What is the difference between app.config file and XYZ.settings file?

I need an XML-serializable dictionary. Actually, I now have two quite different programs that need one. I was rather surprised to see that .NET doesn&#39;t have one.

Can someone enlighten me, given how dependent various .NET features are on XML serialization, why there isn&#39;t an XML-serializable dictionary?

Why isn&#39;t there an XML-serializable dictionary in .NET?

I am currently working on project using asp.net core v1.1, and in my appsettings.json I have:

    &quot;AppSettings&quot;: {
       &quot;AzureConnectionKey&quot;: &quot;***&quot;,
       &quot;AzureContainerName&quot;: &quot;**&quot;,
       &quot;NumberOfTicks&quot;: 621355968000000000,
       &quot;NumberOfMiliseconds&quot;: 10000,
       &quot;SelectedPvInstalationIds&quot;: [ 13, 137, 126, 121, 68, 29 ],
       &quot;MaxPvPower&quot;: 160,
       &quot;MaxWindPower&quot;: 5745.35
    },
I also have class that I use to store them:

    public class AppSettings
    {
        public string AzureConnectionKey { get; set; }
        public string AzureContainerName { get; set; }
        public long NumberOfTicks { get; set; }
        public long NumberOfMiliseconds { get; set; }
        public int[] SelectedPvInstalationIds { get; set; }
        public decimal MaxPvPower { get; set; }
        public decimal MaxWindPower { get; set; }
    }
And DI enabled to use then in Startup.cs:

    services.Configure&lt;AppSettings&gt;(Configuration.GetSection(&quot;AppSettings&quot;));

**Is there any way to change and save `MaxPvPower` and `MaxWindPower` from Controller?**

I tried using

    private readonly AppSettings _settings;

    public HomeController(IOptions&lt;AppSettings&gt; settings)
    {
        _settings = settings.Value;
    }

    [Authorize(Policy = &quot;AdminPolicy&quot;)]
     public IActionResult UpdateSettings(decimal pv, decimal wind)
     {
        _settings.MaxPvPower = pv;
        _settings.MaxWindPower = wind;
            
        return Redirect(&quot;Settings&quot;);
     }
But it did nothing.

All Appsettings Solutions on Gang of Coders

Total of 19 Appsettings Solutions