ASP.NET MVC和Ninject 2.0綁定問題

Question

我有一類稱爲MyMailSender結合稱爲EmailController的asp.net控制器。

E.g.

public EmailController(IMailSender sender) 
    { 
     //MyMailSender 
     this.sender = sender; 
    } 

這MyMailSender類也依賴於一個名爲MessageSender類。

現在我的過程中通過執行以下作品，未經注射。

public class MyMailSender : IMailSender 
{ 
    private IMessageSender messageSender; 

    public MyMailSender() 
    { 
     messageSender = new SmtpMessageSender("mail.address.com", 25); 
    } 
} 

如何使用Ninject將此依賴類綁定到MyMailSender類？

MyMailSender最初的結合是通過控制器工廠結合

public override void Load() 
     { 
       Bind<IMailSender>() 
       .To<MyMailSender>();    
     } 

我試圖綁定到控制器工廠像做：

Bind<IMessageSender>() 
     .To<SmtpMessageSender>().WithConstructorArgument("mail.address.com", 25); 

，但我懷疑，我不應該綁定在這裏對這種類型的結合。我有什麼選擇？

我的錯誤信息是：

Error activating string 
No matching bindings are available, and the type is not self-bindable. 
Activation path: 

    4) Injection of dependency string into parameter hostname of constructor of type SmtpMessageSender 

    3) Injection of dependency IMessageSender into parameter messageSender of constructor of type MyMailSender 

    2) Injection of dependency IMailSender into parameter sender of constructor of type EmailController 

    1) Request for EmailController 


Suggestions: 
    1) Ensure that you have defined a binding for string. 

    2) If the binding was defined in a module, ensure that the module has been loaded into the kernel. 

    3) Ensure you have not accidentally created more than one kernel. 

    4) If you are using constructor arguments, ensure that the parameter name matches the constructors parameter name. 

    5) If you are using automatic module loading, ensure the search path and filters are correct. 

Answer 1

這看上去很好。 （只要這些參數不用於aaplication /線程的生命週期變化）WithConstructorArgument是爲那些類型初始化的。

我會改變MyMailSender這樣使用構造器注入：

public class MyMailSender : IMailSender 
{ 
    private IMessageSender _messageSender; 

    public MyMailSender(IMessageSender messageSender) 
    { 
     _messageSender = messageSender; 
    } 
} 

，然後在onLoad：

public override void Load() 
{      
    Bind<IMessageSender>() 
     .To<SmtpMessageSender>() 
     .WithConstructorArgument("hostname", "mail.address.com") 
     .WithConstructorArgument("port", 25); 
    Bind<IMailSender>() 
     .To<MyMailSender>();  
} 

作爲一般的提示，任何時候你在你的類看new財產以後，把它當成一種氣味。 new在使用任何DI框架時很少出現在您的代碼中（如工廠等）

另一個建議是從某些配置/設置文件加載地址和端口，而不是硬編碼。