如何在ASP.NET MVC 2+中使用模型绑定器的DI / IoC容器？

问题描述

假设我有一个用户实体，我想要将它的构造函数的CreationTime属性设置为DateTime.Now。但是，作为单元测试用户，我不想直接访问DateTime.Now直接使用ITimeProvider：

  public class User { 
 public User（ITimeProvider timeProvider）{
 // ... 
 this.CreationTime = timeProvider.Now; 
} 
 
 // ..... 
} 
 
 public interface ITimeProvider {
 public DateTime Now {get; } 
} 
 
 public class TimeProvider：ITimeProvider {
 public DateTime Now {get {return DateTime.Now;我在我的ASP.NET MVC 2.0应用程序中使用NInject 2，我已经使用了NInject 2。我有一个UserController和两个Create方法（一个用于GET，一个用于POST）。 GET的一个是直接的，但POST的那个不是那么直，而不是那么前进：P，因为我需要混淆模型绑定器来告诉它获得ITimeProvider的实现的引用，以便能够构造一个用户实例。
  public class UserController：Controller {
 
 [HttpGet] 
 public ViewResult Create（）{
 return View（）; 
} 
 
 [HttpPost] 
 public ActionResult创建（用户用户）{
 
 // ... 
 
} 
} 
  
我也希望能够保留默认模型的所有功能绑定。
 
 
 
有机会解决这个简单/优雅的/ etc？ ：D 
解决方案
不用使用 ITimeProvider  
  public class User 
 {
 public Func< DateTime> DateTimeProvider =（）=> DateTime.Now; 
 
 public User（）
 {
 this.CreationTime = DateTimeProvider（）; 
} 
} 
  
在您的单元测试中：
  var user = new User（）; 
 user.DateTimeProvider =（）=>新的DateTime（2010,5,24）; 
  
我知道这不是很优雅，而不是混淆模型绑定器，这可能是一个解决方案。如果这不是一个好的解决方案，您可以实现一个自定义模型绑定，并覆盖方法，您可以在模型的构造函数中注入依赖项。
 
Let's say I have an User entity and I would want to set it's CreationTime property in the constructor to DateTime.Now. But being a unit test adopter I don't want to access DateTime.Now directly but use an ITimeProvider :
public class User {
    public User(ITimeProvider timeProvider) {
        // ...
        this.CreationTime = timeProvider.Now;
    }

    // .....
}

public interface ITimeProvider {
    public DateTime Now { get; }
}

public class TimeProvider : ITimeProvider {
    public DateTime Now { get { return DateTime.Now; } }
}
I am using NInject 2 in my ASP.NET MVC 2.0 application. I have a UserController and two Create methods (one for GET and one for POST). The one for GET is straight forward but the one for POST is not so straight and not so forward :P because I need to mess with the model binder to tell it to get a reference of an implementation of ITimeProvider in order to be able to construct an user instance.
public class UserController : Controller {

    [HttpGet]
    public ViewResult Create() {
         return View();
    }

    [HttpPost]
    public ActionResult Create(User user) {

         // ...

    }
}
I would also like to be able to keep all the features of the default model binder.
Any chance to solve this simple/elegant/etc? :D
 解决方案 
How about instead of using an ITimeProvider try this:
public class User
{
    public Func<DateTime> DateTimeProvider = () => DateTime.Now;

    public User()
    {
        this.CreationTime = DateTimeProvider();
    }
}
And in your unit test:
var user = new User();
user.DateTimeProvider = () => new DateTime(2010, 5, 24);
I know that this is not very elegant but instead of messing with the model binder this could be a solution. If this doesn't feel like a good solution you could implement a custom model binder and override the CreateModel method where you would inject the dependencies in the constructor of the model.
                        
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