I want to create an extension method for WebApplicationBuilder:
public static void AddData(this WebApplicationBuilder builder)
{
var connectionString = builder.Configuration.GetConnectionString("DefaultConnection");
builder.Services.AddDbContext<ApplicationDbContext>(option =>
{
option.UseSqlite(connectionString);
});
}
this method works in a project that use: <Project Sdk="Microsoft.NET.Sdk.Web">,
but if I put this method in a class libary then it doesn't work (<Project Sdk="Microsoft.NET.Sdk>) because it doesn't find Microsoft.AspNetCore.Builder
Otherwise, if I use <Project Sdk="Microsoft.NET.Sdk.Web"> the compiler say that there is no Main in the project.
How can I do?
Why can't I write this?
using Microsoft.AspNetCore.Builder;
I did this recently when I converted to a .Net 6 project. I wasn't able to extend the Builder either, so I added the extension to the IServiceCollection and passed in the configuration. So to use your example, my code looked more like:
public static void AddData(this IServiceCollection services, ApplicationSettings appSettings)
{
services.AddDbContext<ApplicationDbContext>(option =>
{
option.UseSqlite(appSettings.ConnectionString);
});
}
Where ApplicationSettings is a custom class that is bound to the app settings in the json. So my Program.cs has these lines:
var builder = WebApplication.CreateBuilder(args);
ConfigurationManager configuration = builder.Configuration;
var appSettings = new ApplicationSettings();
configuration.Bind(appSettings);
builder.Services.AddData(appSettings);
Using the IServiceCollection in the extension method only requires:
using Microsoft.Extensions.DependencyInjection;