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Aryan Kumar

Aryan Kumar

08-Nov-2023

In .NET Core 6, you can configure connection strings in your ASP.NET Core application using the appsettings.json file and the IConfiguration service. Here's how to configure a connection string:

Create an appsettings.json File:

If you don't already have one, create an appsettings.json file in your project's root directory. This file will store your connection string and other configuration settings.

Here's an example of what your appsettings.json file might look like:

{
  "ConnectionStrings": {
    "DefaultConnection": "YourConnectionStringHere"
  },
  "OtherSettings": {
    "SomeSetting": "SomeValue"
  }
}

Replace "YourConnectionStringHere" with your actual database connection string.

Load Configuration in Startup.cs:

In your Startup.cs file, you need to load the configuration from the appsettings.json file. This is typically done in the ConfigureServices method.

using Microsoft.Extensions.Configuration;

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    public void ConfigureServices(IServiceCollection services)
    {
        // Load

Use the Connection String:

You can now use the connectionString variable in your Startup.cs or any other services or controllers where you need it. For example, you can configure a database context:

public void ConfigureServices(IServiceCollection services)
{
    string connectionString = Configuration.GetConnectionString("DefaultConnection");

    services.AddDbContext<MyDbContext>(options =>
        options.UseSqlServer(connectionString));
    
    // Other services configuration
}

Specify Environment-Specific Connection Strings (Optional):

You can also specify environment-specific connection strings in your appsettings.json file. For example, you can have separate connection strings for development and production environments:

{
  "ConnectionStrings": {
    "DefaultConnection": "YourConnectionStringHere",
    "ProductionConnection": "YourProductionConnectionStringHere"
  },
  "OtherSettings": {
    "SomeSetting": "SomeValue"
  }
}

To use environment-specific connection strings, you can modify your code to select the appropriate connection string based on the current environment, typically by using the IHostEnvironment service:

public void ConfigureServices(IServiceCollection services)
{
    string defaultConnectionString = Configuration.GetConnectionString("DefaultConnection");
    string productionConnectionString = Configuration.GetConnectionString("ProductionConnection");

    string connectionString = Environment.IsProduction() ? productionConnectionString : defaultConnectionString;

    services.AddDbContext<MyDbContext>(options =>
        options.UseSqlServer(connectionString));
    
    // Other services configuration
}

By following these steps, you can configure and use connection strings in your .NET Core 6 application. This approach allows you to centralize your configuration settings and provides flexibility to switch between different connection strings based on the environment.

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