如何解决使用温莎国际奥委会在应用程序启动的用户信息库? [英] How to resolve an user repository using Windsor IoC at the start of the application?
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问题描述
我得到一个错误信息对象引用不设置到对象的实例。当我尝试使用UserRepos存储库。问题是我怎么可以在应用程序启动(ASP.NET MVC)什么是错在这里解决用户存储库?
I get an error message "Object reference not set to an instance of an object." when I try to use an UserRepos repository. Question is how can I resolve user repository at the start of the application (ASP.NET MVC) What is wrong here?
public class MyApplication : HttpApplication
{
public IUserRepository UserRepos;
public IWindsorContainer Container;
protected void Application_Start()
{
Container = new WindsorContainer();
// Application services
Container.Register(
Component.For<IUserRepository>().ImplementedBy<UserRepository>()
);
UserRepos = Container.Resolve<IUserRepository>();
}
private void OnAuthentication(object sender, EventArgs e)
{
if (Context.User != null)
{
if (Context.User.Identity.IsAuthenticated)
{
//Error here "Object reference not set to an instance of an object."
var user = UserRepos.GetUserByName(Context.User.Identity.Name);
var principal = new MyPrincipal(user);
Thread.CurrentPrincipal = Context.User = principal;
return;
}
}
}
}
感谢您对我的帮助!
推荐答案
这异常的原因是一个HttpApplication生命周期的误解。这些文章解释相当不错:
The cause of this exception is a misunderstanding of the HttpApplication lifecycle. These articles explain it quite well:
- http://ayende.com/Blog/archive/2006/ 9月10日/ SolvingTheHttpModuleMess.aspx
- http://blog.andreloker.de/post/2008/ 05 / HttpApplication的-instances.aspx
- http://ayende.com/Blog/archive/2006/09/10/SolvingTheHttpModuleMess.aspx
- http://blog.andreloker.de/post/2008/05/HttpApplication-instances.aspx
在你的情况,这将是正确的容器用法:
in your case, this would be the correct container usage:
public class MyApplication: HttpApplication {
private static IWindsorContainer container;
protected void Application_Start() {
container = new WindsorContainer();
... registrations
}
private void OnAuthentication(object sender, EventArgs e) {
var userRepo = container.Resolve<IUserRepository>();
... code that uses userRepo
}
}
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