How to Access IConfiguration and IHostEnvironment in ASP.NET Core 6 ?

Accessing Configuration in ASP.NET Core 6 Applications

In ASP.NET Core 6 and later, the Startup.cs class is no longer used. Instead, the WebApplicationBuilder and WebApplication classes provide access to configuration and environment settings.

Accessing Configuration via WebApplicationBuilder

The WebApplicationBuilder, obtained via WebApplication.CreateBuilder(args), directly exposes the Configuration and Environment properties:

<code class="language-csharp">var builder = WebApplication.CreateBuilder(args);

// Access configuration
IConfiguration configuration = builder.Configuration;

// Access environment
IWebHostEnvironment environment = builder.Environment; </code>

This approach allows you to access and modify configuration settings during the application's startup phase.

Accessing Configuration via WebApplication

Alternatively, the WebApplication object (obtained from builder.Build()) also provides access to the Configuration and Environment properties:

<code class="language-csharp">var app = builder.Build();

// Access configuration
IConfiguration configuration = app.Configuration;

// Access environment
IWebHostEnvironment environment = app.Environment;</code>

This is useful for accessing configuration after the application has started.

Example: Retrieving Connection String from appsettings.json

Here's how to read a connection string from the appsettings.json file:

<code class="language-csharp">using Microsoft.Extensions.Configuration;
using Microsoft.EntityFrameworkCore;

var builder = WebApplication.CreateBuilder(args);

IConfiguration config = builder.Configuration;

// Retrieve the connection string
string connectionString = config.GetConnectionString("ConnectionString"); // Preferred method for connection strings

// Add DbContext using the connection string
builder.Services.AddDbContext<MyDbContext>(options =>
    options.UseSqlServer(connectionString));</code>

This example demonstrates the preferred method of retrieving connection strings using GetConnectionString(). Using this method is generally recommended for better maintainability and security.

By leveraging the Configuration and Environment objects, developers can effectively manage configuration data and hosting environment details within their ASP.NET Core 6 applications.

The above is the detailed content of How to Access IConfiguration and IHostEnvironment in ASP.NET Core 6 ?. For more information, please follow other related articles on the PHP Chinese website!