asp.net coreのDIにDbContextを追加する

using Microsoft.EntityFrameworkCore;
using XXXContextNamespace;
・・・
var builder = WebApplication.CreateBuilder(args);
・・・
builder.Services.AddDbContext<XXXContext>(opt=>
    opt.UseSqlServer(builder.Configuration.GetConnectionString("XXXConnection")));

using XXXContextNamespace;
・・・
private readonly ILogger<IndexModel> _logger;
private readonly XXXContext _ctx;
public class IndexModel : PageModel {
	public IndexModel(ILogger<IndexModel> logger, XXXContext ctx) {
		_logger = logger;
		_ctx = ctx;
		・・・
	}
}

@page "/"
@using XXXContextNamespace
@inject XXXContext XXXCtx
・・・
XXX:<select>
@if (XXXMasters != null) {
	foreach(var itm in XXXMasters) {
		<option value="@itm.Key">@itm.Name</option>
	}
</select>
・・・
@code {
	protected List<XXXMaster> XXXMasters = null!;
	・・・
	protected async Task OnInitializeAsync() {
		var q = XXXCtx.XXXMaster・・・;
		XXXMasters = await q.ToListAsync();
	}
}