Cannot add appsettings.json inside WPF project .net core 3.0

问题

I am creating a WPF project using .net Core 3.00, and I am having trouble adding the item appsettings.json file to my project which is to be used to store my DB connection string.

I would normally have done inside the app.config, but this has now been removed from .net Core.

Everywhere mentions using appsettings.json as a replacement, and that it has to be maunally added & initialised in the OnStartUp() function using an instance of IConfiguration, and there after using Dependancy Injection to pass in the config class into the project.

But my issue is that can only add the appsettings.json item on asp.net Core projects?? not my WPF solution.

I do appolgies if I'm missing somthing very obvious (which I probally am), I just cant seem to find any solutions.

Many thanks in advance

回答1:

It's no requirement to switch to an appsettings.json file in .NET Core. You may still use the very same "old" XML-based App.config file in a WPF app that targets .NET Core if you want to.

Just add a new configuration file (Project->Add New Item->Application Configuration File) to your project and name it "App.config". If you then add the following contents to it:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
   <connectionStrings>
    <add name="connectionString" connectionString="..."/>
  </connectionStrings>
</configuration>

...you should be able to get the connection string at runtime using the ConfigurationManager API:

ConfigurationManager.ConnectionStrings["connectionString"].ConnectionString;

The default WPF template should include the System.Configuration.ConfigurationManager package by default.

回答2:

Steps:

• To Add the following nuget packages

  Microsoft.Extensions.Configuration
  Microsoft.Extensions.Configuration.FileExtensions
  Microsoft.Extensions.Configuration.Json
  

• You would need to create and add appsettings.json manually and set copy it to output directory as copy if newer

---

AppSetting.json

   {
  "ConnectionStrings": {
    "BloggingDatabase": "Server=(localdb)\\mssqllocaldb;Database=EFGetStarted.ConsoleApp.NewDb;Trusted_Connection=True;"
  },
}

Program.cs (For .NetCore Console App)

static void Main(string[] args)
{
    var builder = new ConfigurationBuilder()
        .SetBasePath(Directory.GetCurrentDirectory())
        .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true);

    IConfigurationRoot configuration = builder.Build();

    Console.WriteLine(configuration.GetConnectionString("BloggingDatabase"));
}

App.xaml.cs (For .NET CORE WPF)

public partial class App : Application
{
    public IServiceProvider ServiceProvider { get; private set; }

    public IConfiguration Configuration { get; private set; }

    protected override void OnStartup(StartupEventArgs e)
    {
        var builder = new ConfigurationBuilder()
         .SetBasePath(Directory.GetCurrentDirectory())
         .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true);

        Configuration = builder.Build();

      Console.WriteLine(configuration.GetConnectionString("BloggingDatabase"));    

        var serviceCollection = new ServiceCollection();
        ConfigureServices(serviceCollection);

        ServiceProvider = serviceCollection.BuildServiceProvider();

        var mainWindow = ServiceProvider.GetRequiredService<MainWindow>();
        mainWindow.Show();
    }

    private void ConfigureServices(IServiceCollection services)
    {
        // ...

        services.AddTransient(typeof(MainWindow));
    }
}

---

References:

• https://blog.bitscry.com/2017/05/30/appsettings-json-in-net-core-console-app/
• https://marcominerva.wordpress.com/2019/03/06/using-net-core-3-0-dependency-injection-and-service-provider-with-wpf/
• https://docs.microsoft.com/en-us/ef/core/miscellaneous/connection-strings

回答3:

add an App.config file to the root of your project and add this code:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>

  <connectionStrings>
    <add name="AppConnectionString" connectionString="YourCS"/>
  </connectionStrings>

  <appSettings>
    <add key="DefaultLanguage" value="1"/>
  </appSettings>

</configuration>

appSettings is with S not s

Now you can read these anywhere of your dotnet core wpf app:

string DefaultLanguage = ConfigurationManager.AppSettings.Get("DefaultLanguage"); 
string ConnectionString = ConfigurationManager.ConnectionStrings["AppConnectionString"].ConnectionString;

来源：https://stackoverflow.com/questions/59909207/cannot-add-appsettings-json-inside-wpf-project-net-core-3-0