Read connectionstring outside startup from appsetting.json in vNext

Read connectionstring outside startup from appsetting.json in vNext

In ASP.NET Core, you can read the connection string from appsettings.json outside of the Startup class by using the ConfigurationBuilder class to build a configuration object. Here's an example:

  • Add the following using statement to your code file:
using Microsoft.Extensions.Configuration;
  • Create a new ConfigurationBuilder object and configure it to use appsettings.json:
var configBuilder = new ConfigurationBuilder() .SetBasePath(Directory.GetCurrentDirectory()) .AddJsonFile("appsettings.json");

In this example, we're creating a new ConfigurationBuilder object and configuring it to use the appsettings.json file in the current directory.

  • Build the configuration object and read the connection string:
var config = configBuilder.Build(); string connectionString = config.GetConnectionString("MyConnectionString");

In this example, we're building the configuration object using the Build() method. We're then using the GetConnectionString() method to read the connection string from the appsettings.json file. The GetConnectionString() method looks for a configuration key that matches the specified connection string name (in this example, "MyConnectionString").

By following these steps, you should be able to read the connection string from appsettings.json outside of the Startup class in ASP.NET Core.

Examples

  1. "ASP.NET Core read connection string from appsettings.json outside Startup"

    • Description: Learn how to read a connection string from appsettings.json outside the Startup class in an ASP.NET Core application. Explore methods to access configuration settings globally.
    // Example code to read connection string outside Startup in ASP.NET Core var configuration = new ConfigurationBuilder() .SetBasePath(Directory.GetCurrentDirectory()) .AddJsonFile("appsettings.json") .Build(); string connectionString = configuration.GetConnectionString("YourConnectionStringName");

  2. "ASP.NET Core access appsettings.json in a class"

    • Description: Explore techniques for accessing appsettings.json from a class in ASP.NET Core. Understand the process of building a configuration object and retrieving settings.
    // Example code to access appsettings.json in a class var configuration = new ConfigurationBuilder() .SetBasePath(Directory.GetCurrentDirectory()) .AddJsonFile("appsettings.json") .Build(); string settingValue = configuration["YourSettingKey"];

  3. "ASP.NET Core read appsettings.json globally"

    • Description: Learn how to read appsettings.json globally in an ASP.NET Core application. Understand the steps to create a configuration object for accessing settings from anywhere in the code.
    // Example code to read appsettings.json globally in ASP.NET Core var configuration = new ConfigurationBuilder() .SetBasePath(Directory.GetCurrentDirectory()) .AddJsonFile("appsettings.json") .Build(); string settingValue = configuration["YourSettingKey"];

  4. "ASP.NET Core configuration outside Startup class"

    • Description: Explore methods for accessing configuration settings outside the Startup class in ASP.NET Core. Learn how to create a configuration object to read values like connection strings.
    // Example code to access configuration outside Startup in ASP.NET Core var configuration = new ConfigurationBuilder() .SetBasePath(Directory.GetCurrentDirectory()) .AddJsonFile("appsettings.json") .Build(); string connectionString = configuration.GetConnectionString("YourConnectionStringName");

  5. "ASP.NET Core read connection string from appsettings.json in a service"

    • Description: Learn how to read a connection string from appsettings.json in a service class in ASP.NET Core. Understand the process of injecting configuration into a service.
    // Example code to read connection string from appsettings.json in a service public class YourService { private readonly IConfiguration _configuration; public YourService(IConfiguration configuration) { _configuration = configuration; } public void YourMethod() { string connectionString = _configuration.GetConnectionString("YourConnectionStringName"); } }

  6. "ASP.NET Core read appsettings.json from a class library"

    • Description: Explore methods for reading appsettings.json from a class library in ASP.NET Core. Learn how to create a configuration object to access settings in a class library.
    // Example code to read appsettings.json from a class library in ASP.NET Core var configuration = new ConfigurationBuilder() .SetBasePath(Directory.GetCurrentDirectory()) .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true) .Build(); string settingValue = configuration["YourSettingKey"];

  7. "ASP.NET Core inject IConfiguration into class"

    • Description: Understand how to inject IConfiguration into a class in ASP.NET Core for accessing configuration settings. Explore the process of dependency injection for configuration.
    // Example code to inject IConfiguration into a class in ASP.NET Core public class YourClass { private readonly IConfiguration _configuration; public YourClass(IConfiguration configuration) { _configuration = configuration; } public void YourMethod() { string settingValue = _configuration["YourSettingKey"]; } }

  8. "ASP.NET Core read appsettings.json in a background task"

    • Description: Explore methods for reading appsettings.json in a background task or worker service in ASP.NET Core. Understand how to access configuration settings in non-web scenarios.
    // Example code to read appsettings.json in a background task var configuration = new ConfigurationBuilder() .SetBasePath(Directory.GetCurrentDirectory()) .AddJsonFile("appsettings.json") .Build(); string settingValue = configuration["YourSettingKey"];

  9. "ASP.NET Core read connection string in a filter"

    • Description: Learn how to read a connection string from appsettings.json within an action filter in ASP.NET Core. Explore the process of injecting IConfiguration into a filter.
    // Example code to read connection string in an action filter in ASP.NET Core public class YourFilter : IActionFilter { private readonly IConfiguration _configuration; public YourFilter(IConfiguration configuration) { _configuration = configuration; } public void OnActionExecuting(ActionExecutingContext context) { string connectionString = _configuration.GetConnectionString("YourConnectionStringName"); } public void OnActionExecuted(ActionExecutedContext context) { // Implementation } }

  10. "ASP.NET Core read connection string in a background hosted service"

    • Description: Explore how to read a connection string from appsettings.json in a background hosted service or worker in ASP.NET Core. Understand how to access configuration settings in a background service.
    // Example code to read connection string in a background hosted service public class YourHostedService : BackgroundService { private readonly IConfiguration _configuration; public YourHostedService(IConfiguration configuration) { _configuration = configuration; } protected override async Task ExecuteAsync(CancellationToken stoppingToken) { string connectionString = _configuration.GetConnectionString("YourConnectionStringName"); // Background service logic } }

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