ASP.NET Core 中间件获取依赖注入

    public async static Task (this IApplicationBuilder app)
    {

app.ApplicationServices.GetRequiredService<ObjectAccessor<IApplicationBuilder>>()
    }

{
    public interface IApplicationBuilder
    {

        IFeatureCollection ServerFeatures { get; }

        IDictionary<string, object?> Properties { get; }

        RequestDelegate Build();

        IApplicationBuilder New();

        IApplicationBuilder Use(Func<RequestDelegate, RequestDelegate> middleware);
    }