.NET 如何在 OIDC 中间件中访问 DBContext

Question

我有以下Startup.cs#ConfigureServices方法：

  public void ConfigureServices(IServiceCollection services)
    {
        services.AddAuthentication(AzureADDefaults.AuthenticationScheme)
            .AddAzureAD(options => { Configuration.Bind("AzureAd", options); });

        //Register TracingContext to access the DB
        services.AddDbContext<TracingContext>(options =>
        {
            options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection"));
        });

        services.Configure<OpenIdConnectOptions>(AzureADDefaults.OpenIdScheme, options =>
        {
            options.Events = new OpenIdConnectEvents
            {
                OnTokenValidated = ctx =>
                {
                    // Get the user's email 
                    var email = ctx.Principal.Claims.FirstOrDefault(c => c.Type == ClaimTypes.Name)?.Value;

                    // Query the database to get the role
                    **// BUT: How do I access the TracingContext from above?** 
                    **// CODE HERE **

                    // Add claims
                    var claims = new List<Claim>
                    {
                        new Claim(ClaimTypes.Role, "HQUser")
                    };
                    var appIdentity = new ClaimsIdentity(claims);

                    ctx.Principal.AddIdentity(appIdentity);

                    return Task.CompletedTask;
                },
            };
        });
    }

由于我在方法中使用services.AddDbContext(...)定义了TracingContext (DBContext)，如何才能访问OICD中间件中的TracingContext？

此时我需要从数据库中检索用户的角色。

谢谢

Answer 1

你可以使用HttpContext.RequestServices.GetRequiredService来获取依赖：

var db = ctx.HttpContext.RequestServices.GetRequiredService<YourDbContext>();