Consuming asp.net core web api in asp.net core mvc web app-CodePudding

I'm trying to consume my asp.net web api in my asp.net core mvc web app which are on the same solution. I configured the solution for multi-project start and they start both.

next I tried to consume the API in the Web part but I'm getting the following error.

InvalidOperationException: A suitable constructor for type 'ProjectName.Web.Services.Interfaces.IAdminService' could not be located. Ensure the type is concrete and all parameters of a public constructor are either registered as services or passed as arguments. Also ensure no extraneous arguments are provided. Microsoft.Extensions.DependencyInjection.ActivatorUtilities.FindApplicableConstructor(Type instanceType, Type[] argumentTypes, out ConstructorInfo matchingConstructor, out Nullable[] matchingParameterMap)

Here is the complete Stack trace

The Projects are structure like this

SolutionName:
Name.API
Name.Web

each with its own respective structure

This is my Helper Class

public static class HttpClientExtensions
    {
        public static async Task<T> ReadContentAsync<T>(this HttpResponseMessage response)
        {
            //if (response.IsSuccessStatusCode == false) return StatusCodes =  300;
                //throw new ApplicationException($"Something went wrong calling the API: {response.ReasonPhrase}");
                
            var dataAsString = await response.Content.ReadAsStringAsync().ConfigureAwait(false);

            var result = JsonSerializer.Deserialize<T>(
                dataAsString, new JsonSerializerOptions
                {
                    PropertyNameCaseInsensitive = true
                });

            return result;
        }
    }

The IAdmin Inter Face

Task<IEnumerable<Admins>> GetAllAdmins();

The AdminService(Implementation)

private readonly HttpClient _client;
        public const string BasePath = "api/Admins";

        public AdminService(HttpClient client)
        {
            _client = client; // ?? throw new ArgumentNullException(nameof(client));
        }

        public async Task<IEnumerable<Admins>> GetAllAdmins()
        {
            var response = await _client.GetAsync(BasePath);

            return await response.ReadContentAsync<List<Admins>>();
        }

Admins Controller

     private readonly IAdminService _adminService;

        public AdminController(IAdminService adminService)
        {
            _adminService = adminService;
        }


        public async Task<IActionResult> Index()
        {
            var adminsList = await _adminService.GetAllAdmins();

            if(adminsList == null)
            {
                return new JsonResult("There are now Admins");
            }

            return View(adminsList);
        }

Program.cs

builder.Services.AddControllersWithViews();

builder.Services.AddHttpClient<IAdminService, IAdminService>(c =>
c.BaseAddress = new Uri("https://localhost:<port-Num>/"));


var app = builder.Build();

What Could I be doing wrong??? I'm using .NET 6 adn both Projects are in the same solution

NB My end points are working fine, I test them using Postman.

CodePudding user response：

It is failing because DI cannot instantiate your AdminService with parameterized constructor. This is possibly a duplicate of Combining DI with constructor parameters? .

Essentially, you should avoid parameterized constructor injection where possible. Either control it through configuration or have the configuration loaded through common infrastructure such as host configuration.

CodePudding user response：

According to your codes, I found you put two interface inside the AddHttpClient method which caused the issue.

I suggest you could modify it like this and then it will work well.

builder.Services.AddHttpClient<IAdminService, AdminService>(c =>
c.BaseAddress = new Uri("https://localhost:3333/"));