Castle.Windsor - 依賴注入調用無參數構造函數的參數構造函數

Question

我們使用Castle.Windsor進行我們的asp.net mvc（C＃）應用程序的依賴注入。

如何解決在調用無參數構造函數時在參數構造函數中聲明的依賴？

以下是ErrorController代碼：

public class ErrorController : BaseController 
{ 
     #region Declaration 
     private readonly ICommonService _commonService; 
     #endregion 

     #region Constructor 
     public ErrorController() 
     { 
     } 
     public ErrorController(ICommonService commonService) 
      : base(commonService) 
     { 
      this._commonService = commonService; 
     } 
     #endregion 
. 
. 
. 
} 

以下是在Global.asax的代碼，用於如果出現任何錯誤顯示自定義錯誤頁：

protected void Application_Error() 
     { 
      Exception lastException = Server.GetLastError(); 
      HttpException httpException = lastException as HttpException; 
      RouteData routeData = new RouteData(); 

      //Possible reason for null is the the server error may not be a proper http exception 
      if (httpException == null) 
      { 
       errorController = new ErrorController(); 
       routeData.Values.Add("controller", "Error"); 
       routeData.Values.Add("action", "Index"); 
       Response.Clear(); 
      } 
      else 
      //It's an Http Exception, Let's handle it. 
      { 
       switch (httpException.GetHttpCode()) 
       { 
        case 404: 
         //Page not found. 
         //Call target Controller 
         errorController = new ErrorController(); 
         routeData.Values.Add("controller", "Error"); 
         routeData.Values.Add("action", "PageNotFound"); 
         break; 
        case 302: 
         //Page Temporarily Moved 
         errorController = new ErrorController(); 
         routeData.Values.Add("controller", "Error"); 
         routeData.Values.Add("action", "PageNotFound"); 
         break; 
        case 500: 
         //Server error. 
         errorController = new ErrorController(); 
         routeData.Values.Add("controller", "Error"); 
         routeData.Values.Add("action", "Index"); 
         Response.Clear(); 
         break; 
        default: 
         errorController = new ErrorController(); 
         routeData.Values.Add("controller", "Error"); 
         routeData.Values.Add("action", "Index"); 
         Response.Clear(); 
         break; 
       } 
      } 
      //Pass exception details to the target error View. 
      routeData.Values.Add("error", lastException); 
      //Clear the error on server. 
      Server.ClearError(); 
      //Call target Controller and pass the routeData. 
      errorController.Execute(new RequestContext(new HttpContextWrapper(Context), routeData)); 
     } 

從全局。 asax，我們調用ErrorController調用無參數構造函數，並且它無法解決ErrorService中用於從數據庫收集一些基本數據的CommonService的依賴性。但是_commonService沒有被初始化，並且它的拋出null。請建議如何處理這種情況。

更新

下面就是我所說的依賴注入在Global.asax

protected void Application_Start() 
     { 
. 
. 

      BootstrapContainer(); 
     } 


private static void BootstrapContainer() 
     { 
      container = new WindsorContainer().Install(
       new ServiceInstaller(), 
       FromAssembly.This() 
       ); 
      var controllerFactory = new WindsorControllerFactory(container.Kernel); 
      ControllerBuilder.Current.SetControllerFactory(controllerFactory); 
     } 

下面的代碼是在控制器和服務是regsitered和BootstrapContainer代碼：

public class ControllersInstaller : IWindsorInstaller 
    { 
     public void Install(IWindsorContainer container, IConfigurationStore store) 
     { 
      container.Register(Classes.FromThisAssembly() 
           .BasedOn<IController>() 
           .LifestyleTransient()); 
     } 
    } 


public class ServiceInstaller : IWindsorInstaller 
    { 
     public void Install(IWindsorContainer container, IConfigurationStore store) 
     { 
      container.Register(Component.For<ICommonService>().ImplementedBy<CommonService>().LifeStyle.PerWebRequest); 
. 
. 
. 
} 
} 

Answer 1

你可以得到Castle來解決你的控制器：

switch (httpException.GetHttpCode()) 
{ 
     case 404: 
     errorController = container.Resolve<ErrorController>(); 
     routeData.Values.Add("controller", "Error"); 
     …