更改ASP.NET Core中的配置文件

Question

I am trying to create a self-contained .NET Core Console Application. In my application, I have added a configuration file appsettings.json . The goal is now that I need to have the possibility to modify the configuration file while the application is running (and published)

I have found several guides but they all point to the direction where I need to include the following function:

        public void ConfigureServices(IServiceCollection services)
    {
        // Adds services required for using options.
        services.AddOptions();

        // Register the IConfiguration instance which MyOptions binds against.
        services.Configure<DBSetting>(Configuration);

        // Add framework services.
        services.AddMvc();
    }

But when I do this all the methodes of services are red. If I look u IserviceCollection the doc says that it has become obsolete. I did add

            var builder = new ConfigurationBuilder()
            .AddJsonFile(@"C:\Users\Maarten\Documents\Visual Studio 2015\Projects\CorporationBot\CorporationBotCore\appsettings.json", optional: true, reloadOnChange:true);                
        Configuration = builder.Build();

in my Program.cs which lets me fetch the data in my config file. Now I need a way to change my config while the application is running. Any up to date ways to do it?

Answer 1

According to Microsft configurations that are written into built-in providers are not persisted. So you may need to write a custom provider and implement save there. Following link provides more info about asp.net configuration and a sample custom EF provider.

https://docs.microsoft.com/en-us/aspnet/core/fundamentals/configuration?tabs=basicconfiguration

As a side note, if the value tends to change at runtime.Database or some other place also can be a possible alternative.

Answer 2

Looks like you forgot to add or restore nuget packages related to configuration feature .

• add a dependency to Microsoft.Extensions.Configuration
• add a dependency to Microsoft.Extensions.Configuration.Json
• run dotnet restore

And don't forget to add namespace: using Microsoft.Extensions.Configuration;