Mvc 5统一依赖注入:我的代码中有什么问题? [英] Mvc 5 unity dependency injection : whats wrong in my code?
问题描述
您好我第一次在示例项目中使用依赖注入和工作单元。
IUnitOfWork.cs
Hi I am first time using dependency injection and unit of work in sample project.
IUnitOfWork.cs
using System;
using WDCS.BusinessLogic.Infrastructure.Interfaces.UserRepo;
namespace WDCS.BusinessLogic.Infrastructure.Interfaces
{
public interface IUnitOfWork : IDisposable
{
IUserRepository UesrRepository { get; }
void SaveChages();
}
}
UnitOfWork.cs
UnitOfWork.cs
using System;
using WDCS.BusinessLogic.Infrastructure.Interfaces;
using WDCS.BusinessLogic.Infrastructure.Interfaces.UserRepo;
using WDCS.Data;
using WDCS.SqlRepository.UserRepo;
namespace WDCS.SqlRepository
{
public class UnitOfWork : IUnitOfWork
{
public WDCSContext db = null;
public UnitOfWork()
{
db = new WDCSContext();
}
public IUserRepository _uesrRepository;
public IUserRepository UesrRepository
{
get
{
if (_uesrRepository == null)
{
_uesrRepository = new UserRepository(db);
}
return _uesrRepository;
}
}
public void SaveChages()
{
db.SaveChanges();
}
private bool disposed = false;
protected virtual void Dispose(bool disposing)
{
if (!this.disposed)
{
if (disposing)
{
db.Dispose();
}
}
this.disposed = true;
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
}
}
UnityConfig.cs
UnityConfig.cs
using System.Web.Mvc;
using Microsoft.Practices.Unity;
using Unity.Mvc5;
using WDCS.BusinessLogic.Infrastructure.Interfaces;
using WDCS.SqlRepository;
namespace WDCS.WebApi
{
public static class UnityConfig
{
public static void RegisterComponents()
{
var container = new UnityContainer();
// register all your components with the container here
// it is NOT necessary to register your controllers
// e.g. container.RegisterType<ITestService, TestService>();
container.RegisterType<IUnitOfWork, UnitOfWork>();
DependencyResolver.SetResolver(new UnityDependencyResolver(container));
}
}
}
LoginController.cs
LoginController.cs
using WDCS.BusinessLogic.Infrastructure.Interfaces;
using WDCS.Data;
namespace WDCS.WebApi.Controllers
{
public class LoginController : ApiController
{
private IUnitOfWork _uow = null;
public LoginController(IUnitOfWork uow)
{
_uow = uow;
}
[HttpPost]
public IHttpActionResult Login([FromBody] User user)
{
var res = _uow.UesrRepository.Login(user.userName, user.password);
if (res != null)
return Ok(res);
else
return BadRequest("Invalid Username or password");
}
[HttpGet]
public IHttpActionResult Ping()
{
return Ok(_uow.UesrRepository.GetAll());
}
}
}
但是当我运行应用程序并试图点击< a href =http:// localhost / WDCS / api / Login / ping> http:// localhost / WDCS / api / Login / ping [ ^ ]收到以下错误。
but when I am running the app and trying to hit http://localhost/WDCS/api/Login/ping[^] getting following error.
{"Message":"An error has occurred.","ExceptionMessage":"An error occurred when trying to create a controller of type 'LoginController'. Make sure that the controller has a parameterless public constructor.","ExceptionType":"System.InvalidOperationException","StackTrace":" at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType)\r\n at System.Web.Http.Controllers.HttpControllerDescriptor.CreateController(HttpRequestMessage request)\r\n at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext()","InnerException":{"Message":"An error has occurred.","ExceptionMessage":"Type 'WDCS.WebApi.Controllers.LoginController' does not have a default constructor","ExceptionType":"System.ArgumentException","StackTrace":" at System.Linq.Expressions.Expression.New(Type type)\r\n at System.Web.Http.Internal.TypeActivator.Create[TBase](Type instanceType)\r\n at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.GetInstanceOrActivator(HttpRequestMessage request, Type controllerType, Func`1& activator)\r\n at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType)"}}
请帮我解决这个问题。
我尝试了什么:
我尝试过这些链接上的任何内容
http://sarangasl.blogspot.in/2015/04/mvc-5 -with-unity-for-dependency.html
http://www.dotnet-tricks.com/Tutorial/dependencyinjection/632V140413-Dependency-Injection-in-ASP.NET-MVC-4-使用-Unity-IoC-Container.html
我遵循相同的但无法弄清楚究竟是什么问题。
Please help me to solve this issue.
What I have tried:
I have tried whatever I got on these links
http://sarangasl.blogspot.in/2015/04/mvc-5-with-unity-for-dependency.html
http://www.dotnet-tricks.com/Tutorial/dependencyinjection/632V140413-Dependency-Injection-in-ASP.NET-MVC-4-using-Unity-IoC-Container.html
I followed the same but not able to figure out what is the exact issue.
推荐答案
经过大量的搜索后得到了解决方案。上面也是正确的但这对于简单的MVC我需要MVC WebAPI。这里是解决方案的链接
Dep ASP.NET Web API 2中的依赖注入ASP.NET站点 [ ^ ]
After doing lot of search got the solution. Above is also right but this for simple MVC and I needed for MVC WebAPI. here is link for solution
Dependency Injection in ASP.NET Web API 2 | The ASP.NET Site[^]
您无需更改代码中的任何内容,只需使用安装包Unity.WebApi。希望它有所帮助!
You no need to change anything in your code but just use install-package Unity.WebApi instead. Hope it helps!
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