first sorry if my english isn't good enough XD. Second, I'm programing on ASP.NET Core 2.0. And when i launch my webapp i get the next error when i try to go to the "Clases" web page of my App.
InvalidOperationException: Unable to resolve service for type 'EduCloud.Data.IClassInfo' while attempting to activate 'EduCloud.Controllers.UnitsController'.
Before all, sorry if it is too much code. The code for the Model involve is
using System;
using System.Collections.Generic;
using System.Text;
namespace EduCloud.Data.Models
{
public class ClassInfo
{
public int Id { get; set; }
public string Title { get; set; }
public string Description { get; set; }
public string ClassVideoUrl { get; set; }
public string ClassHomeworkUrl { get; set; }
public string TestUrl { get; set; }
public virtual ApplicationUser User { get; set; }
public virtual Forum Forum { get; set; }
}
}
This Model has 1 level of abstraction with the class
using EduCloud.Data.Models;
using System;
using System.Collections.Generic;
using System.Text;
using System.Threading.Tasks;
namespace EduCloud.Data
{
public interface IClassInfo
{
ClassInfo GetById(int id);
IEnumerable<ClassInfo> GetAll();
IEnumerable<ClassInfo> GetFilteredClasses(Forum forum, string searchQuery);
IEnumerable<ClassInfo> GetFilteredClasses(string searchQuery);
IEnumerable<ClassInfo> GetClassesByForum(int id);
Task Add(ClassInfo classInfo);
Task Delete(int id);
Task EditClassContent(int id, string newContent);
}
}
Next, the methods of the this IClass are in the next class
using EduCloud.Data;
using EduCloud.Data.Models;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace EduCloud.Service
{
public class ApplicationClassService : IUnit
{
private readonly ApplicationDbContext _context;
public ApplicationClassService(ApplicationDbContext context)
{
_context = context;
}
public async Task Create(ClassInfo classInfo)
{
_context.Add(classInfo);
await _context.SaveChangesAsync();
}
public Task Delete(int classId)
{
throw new NotImplementedException();
}
public IEnumerable<Forum> GetAll()
{
return _context.Forums
.Include(forum => forum.Classes);
}
public Forum GetById(int id)
{
var forum = _context.Forums.Where(f => f.Id == id)
.Include(f => f.Classes ).ThenInclude(p => p.User)
//.Include(f => f.Classes).ThenInclude(p => p.Replies).ThenInclude(r => r.User)
.FirstOrDefault();
return forum;
}
public Task UpdateForumTitle(int classId, string newTitle)
{
throw new NotImplementedException();
}
}
}
Finally the Controller
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using EduCloud.Data;
using EduCloud.Data.Models;
using EduCloud.Models.Classes;
using EduCloud.Models.Units;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Mvc;
namespace EduCloud.Controllers
{
public class UnitsController : Controller
{
private readonly IUnit _unitService;
private readonly IForum _forumService;
private readonly IClassInfo _classService;
public UnitsController(IUnit unitService, IForum forumService, IClassInfo classService)
{
_unitService = unitService;
_forumService = forumService;
_classService = classService;
}
public IActionResult Index()
{
var units = _unitService.GetAll()
.Select(forum => new UnitsListingModel
{
Id = forum.Id,
Name = forum.Title,
});
var model = new UnitsIndexModel
{
UnitList = units
};
return View(model);
}
}
}
And the code of the view that i try to run when i go to the "Clases" link
#model EduCloud.Models.Units.UnitsIndexModel
<h1>Unidades de Aprendizaje</h1>
<table class="table table-hover" id="forumIndexTable">
<tbody>
#foreach (var forum in Model.UnitList)
{
<tr>
<td>
<a asp-controller="Units" asp-action="ClassesList" asp-route-id="#forum.Id">
#forum.Name
</a>
</td>
</tr>
}
</tbody>
</table>
Related
I am trying to connect a new Blazor app I have to a REST API created through Django. However I am unable to create the services file as it appears with the error. How should I change BlogPost.cs so that it connects to the API?
Cannot implicitly convert type 'Starter.PostModels.Post[]' to 'System.Collections.Generic.IEnumerable<Starter.UI.Services.BlogPost>' [Starter]"
Starter/Services/BlogPost.cs
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Net.Http;
using System.Net.Http.Json;
namespace Starter.UI.Services
{
public class BlogPost : IBlogPost
{
private readonly HttpClient httpClient;
public BlogPost(HttpClient httpClient)
{
this.httpClient = httpClient;
}
public async Task<IEnumerable<BlogPost>> GetPosts()
{
return await httpClient.GetFromJsonAsync<Post[]>("http://127.0.0.1:8000/api/");
}
}
}
Starter/Services/IBlogPost.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
namespace Starter.UI.Services
{
public interface IBlogPost
{
Task<IEnumerable<BlogPost>> GetPosts();
}
}
Starter/Models/Post.cs
using System;
namespace Starter.PostModels
{
public class Post
{
public string title { get; set; } = default!;
public string author { get; set; } = default!;
public string content { get; set; } = default!;
public string status { get; set; } = default!;
}
}
Starter/Pages/Blog.razor
#page "/blog"
#using Starter.PostModels'
#using Starter.UI.Services
#inject IBlogPost GetPosts;
<h1>Blog Posts</h1>
#code{
private IEnumerable<Post> Data = null;
protected override async Task OnInitializedASync()
{
await base.OnInitializedAsync();
Data = await IBlogPost.GetPosts();
}
}
You are trying to Post[] to a IEnumerable
public async Task<IEnumerable<BlogPost>> GetPosts()
{
return await httpClient.GetFromJsonAsync<Post[]>("http://127.0.0.1:8000/api/");
}
Try this
public async Task<IEnumerable<Post>> GetPosts()
{
return await httpClient.GetFromJsonAsync<IEnumerable<Post>>("http://127.0.0.1:8000/api/");
}
I started develop my project - web application with Database. I used WEB API with entity framework
I need CRUD operations realize in my project.
Read - work fine
But I don't know how realize Create, Update, Delete; I don't have enough experience and be glad yours advice.
I tried realize good architecture of my application - using repository pattern and fabric pattern. If you have advice in architecture of my project , I'll be grateful you.
I don't know how realize it in value controller and repository, could you help please?
Attach my code:
Repository
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace WebAPI
{
public class CustomerRepository
{
public IQueryable<Customer> GetAllCustomers()
{
DevelopersEntities dev = new DevelopersEntities();
return dev.Customers;
}
public IQueryable<Customer> GetAllCustomers(int id)
{
DevelopersEntities dev = new DevelopersEntities();
return dev.Customers.Where(c=>c.Id==id).Select(e=>e);
}
public IQueryable<Customer> DeleteCustomer(int id)
{
DevelopersEntities dev = new DevelopersEntities();
return dev.Customers.Remove(id);
}
public IQueryable<Customer> CreateCustomer()
{
DevelopersEntities dev = new DevelopersEntities();
}
public IQueryable<Customer> UpdateCustomer(int id)
{
DevelopersEntities dev = new DevelopersEntities();
}
}
}
Customer model
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using WebAPI;
namespace DevelopersWeb.Models
{
public class CustomerModel
{
public int CustomerId { get; set; }
public string CustomerName { get; set; }
public IEnumerable<HardwareModel> Hardware { get; set; }
public IEnumerable<SoftwareModel> Software { get; set; }
}
}
Harware Model
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace DevelopersWeb.Models
{
public class HardwareModel
{
public int HardwareId { get; set; }
public string HardwareName { get; set; }
}
}
Software Model
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace DevelopersWeb.Models
{
public class SoftwareModel
{
public int SoftwareId { get; set; }
public string SoftwareName { get; set; }
}
}
Model Factory
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using WebAPI;
namespace DevelopersWeb.Models
{
public class ModelFactory
{
public CustomerModel Create(Customer customer)
{
return new CustomerModel()
{
CustomerId = customer.Id,
CustomerName = customer.Name,
Hardware = customer.HardWares.Select(h=>Create(h)),
Software = customer.Softwares.Select(c=>Create(c))
};
}
public HardwareModel Create(HardWare hardware)
{
return new HardwareModel()
{
HardwareId = hardware.HardWareId,
HardwareName = hardware.HardWareName,
};
}
public SoftwareModel Create(Software software)
{
return new SoftwareModel()
{
SoftwareId = software.SoftwareId,
SoftwareName = software.SoftwareName
};
}
}
}
Value Controller
using DevelopersWeb.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using WebAPI;
namespace DevelopersWeb.Controllers
{
public class ValuesController : ApiController
{
ModelFactory _modelFactory;
public ValuesController()
{
_modelFactory = new ModelFactory();
}
// GET api/values
public IEnumerable<CustomerModel> Get()
{
CustomerRepository cr = new CustomerRepository();
return cr.GetAllCustomers().ToList().Select(c=> _modelFactory.Create(c));
}
// GET api/values/5
public string Get(int id)
{
return "xxx";
}
// POST api/values
public void Post([FromBody]string value)
{
}
// PUT api/values/5
public void Put(int id, [FromBody]string value)
{
}
// DELETE api/values/5
public void Delete(int id)
{
}
}
}
Here is how you should save customer object:
public void CreateCustomer(Customer customer)
{
DevelopersEntities dev = new DevelopersEntities();
dev.Customers.Add(customer)
dev.SaveChanges();
}
Here is you api action:
// POST api/values
public void Post([FromBody]CustomerModel customerModel)
{
//Here you should transform CustomerModel object to customerEntity
CustomerRepository cr = new CustomerRepository();
cr.CreateCusomer(customer);
return Ok();
}
You should think about using Dependency Injection pattern here as well.
I want to create a route attribute in the Porosi controller, in the detaje method that takes as a DatePorosie (DatePorosie is the date) on parameter. The method must display from Porosi.cs class EmriPorosise, DatePorosie, TotaliPorosise according to the date that comes as a parameter in url. (sending date value either by form or by link). I hope I explained it well. Can you help me please???
This is Porosi.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace MvcProjektDb.Models
{
public class Porosi
{
public int PorosiId { get; set; }
public string EmriPorosise { get; set; }
public DateTime DatePorosie { get; set; }
public int TotaliPorosise { get; set; }
public int? KlienteId { get; set; }
public virtual Kliente Kliente { get; set; }
}
}
This is PorosiController.cs but I don't know what to do here
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using MvcProjektDb.Migrations;
using MvcProjektDb.Models;
namespace MvcProjektDb.Controllers
{
public class PorosiController : Controller
{
private ApplicationDbContext _db;
public PorosiController()
{
_db = new ApplicationDbContext();
}
protected override void Dispose(bool disposing)
{
_db.Dispose();
}
// GET: Porosi
public ActionResult Index()
{
return View();
}
[Route("Porosi/detaje/{dateporosie?}")]
public ActionResult detaje(DateTime? dateporosie)
{
var x = _db.porosi.Where(p => p.DatePorosie == dateporosie).ToList();
return View(x);
}
}
}
I'm trying Firestore with the nugget package Google.Cloud.Firestore
I followed this intro CRUD with firestore
Using the debugger I can see that the execution of the program stops when trying to call the method Query.GetSnapshotAsync()
I want to get just a list of documents from a collection.
Controller
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Web.Http;
using System.Web.Http.Results;
using FirestoreAPI.Domain.Restaurants;
using FirestoreAPI.Repository.Restaurants;
using System.Threading.Tasks;
namespace FirestoreAPI.Controllers
{
[RoutePrefix("api")]
public class RestaurantsController : ApiController
{
public RestaurantsController() { }
[HttpGet]
[Route("restaurants")]
public IHttpActionResult GetAllRestaurants()
{
//var restAggregate = new RestaurantsAggregate();
var restaurantsRepo = new RestaurantsRepo();
return new NegotiatedContentResult<Task<List<Restaurant>>>(
HttpStatusCode.OK,
restaurantsRepo.GetAllRestaurants(),
this
); ;
}
}
}
DataLayer
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Web;
using Google.Cloud.Firestore;
namespace FirestoreAPI.Repository.Restaurants
{
public class RestaurantsRepo
{
//public FirestoreConn dbConn;
string projectId;
FirestoreDb firestoreDb;
public RestaurantsRepo()
{
//dbConn = new FirestoreConn();
string credentials = "C:\\Users\\ezequiel.lopez\\projects\\firestoredotnet\\FirestoreAPI\\firestoreapi-dca55-0be2f7d57f41.json";
Environment.SetEnvironmentVariable("GOOGLE_APPLICATION_CREDENTIALS", credentials);
projectId = "firestoreapi-dca55";
firestoreDb = FirestoreDb.Create(projectId);
}
public async Task<List<Restaurant>> GetAllRestaurants()
{
//FirestoreDb fsDB = dbConn.GetFSConnection();
//Query query = fsDB.Collection("restaurants").OrderByDescending("avgRating").Limit(50);
Query query = firestoreDb.Collection("restaurants").OrderByDescending("avgRating").Limit(50);
QuerySnapshot restSnaps = await query.GetSnapshotAsync();
List<Restaurant> restaurants = new List<Restaurant>();
return restSnaps.Documents
.Where<DocumentSnapshot>(ds => ds.Exists)
.Select(ds => ds.ConvertTo<Restaurant>()).ToList();
}
}
}
Restaurant
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Google.Cloud.Firestore;
namespace FirestoreAPI.Repository.Restaurants
{
[FirestoreData]
public class Restaurant
{
[FirestoreProperty]
public decimal avgRating { get; set; }
[FirestoreProperty]
public string category { get; set; }
[FirestoreProperty]
public string city { get; set; }
[FirestoreProperty]
public string name { get; set; }
[FirestoreProperty]
public int numRatings { get; set; }
[FirestoreProperty]
public int price { get; set; }
}
}
I was having the same issue. Thing is, I was calling an async method from a synchronous one. It didn't work until I've made my caller method async and awaited for it.
I would like to show all data from database.
But it doesn't work.
My Web.config file
<connectionStrings>
<add name="EFDbContext" providerName="System.Data.SqlClient"
connectionString="Data Source=(LocalDb)\v11.0;Initial Catalog=NewsList;Integrated Security=True"/>
Controller:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using NewsList.Domain.Abstract;
using NewsList.Domain.Entities;
namespace NewsList.WebUI1.Controllers
{
public class NewsController : Controller
{
//
// GET: /News/
private INewsRepository repository;
public NewsController(INewsRepository newsRepository)
{
this.repository = newsRepository;
}
public ViewResult List()
{
return View(repository.NewsList);
}
public ActionResult Index()
{
return View();
}
}
}
Model
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace NewsList.Domain.Entities
{
public class News
{
public int NewsID { get; set; }
public string Title { get; set; }
public string Description { get; set; }
public string Text { get; set; }
}
}
View
#model IEnumerable<NewsList.Domain.Entities.News>
#{
ViewBag.Title = "News";
}
#foreach (var p in Model)
{
<div class="item">
<h3>#p.Title</h3>
#p.Description
<h4>#p.Text</h4>
</div>
}
And now I haven't got any exeptions. Only clear while browser page.
Just as an example:
public class NewsRepository : INewsRepository
{
private YourDbContext db = null;
public List<NewsList> NewsList
{
return this.db.NewsList.ToList();
}
public NewsRepository()
{
this.db = new NewsRepository();
}
}
public class YourDbContext : DbContext
{
public DbSet<NewsList> NewsList {get; set;}
}