按照我在这个帖子中得到的建议 [ Ninject UOW pattern, new ConnectionString after user is authenticated我现在明白我不应该使用以下行...
var applicationConfiguration =
(IApplicationConfiguration)
DependencyResolver.Current.GetService(typeof(IApplicationConfiguration));
...作为服务定位器是一种反模式。
但在以下过程中,我如何实例化实现“IApplicationConfiguration”的具体对象,以便我可以使用该对象获取未知用户角色名称,或使用它来分配我的原则的“ApplicationConfiguration”属性?
Global.asax
public class MvcApplication : NinjectHttpApplication
{
/// <summary>
/// Handles the PostAuthenticateRequest event of the Application control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="EventArgs"/> instance containing the event data.</param>
protected void Application_PostAuthenticateRequest(Object sender, EventArgs e)
{
String[] roles;
var applicationConfiguration =
(IApplicationConfiguration)
DependencyResolver.Current.GetService(typeof(IApplicationConfiguration));
var identity = HttpContext.Current.User.Identity;
if (Request.IsAuthenticated)
{
roles = Roles.GetRolesForUser(identity.Name);
}
else
{
roles = new[] { applicationConfiguration.UnknownUserRoleName };
}
var webIdentity = new WebIdentity(identity, roles);
var principal = new WebsitePrincipal(webIdentity)
{
ApplicationConfiguration = applicationConfiguration
};
HttpContext.Current.User = principal;
}
.
.
.
}
分辨率映射代码
public class ApplicationConfigurationContractMapping : NinjectModule
{
public override void Load()
{
Bind<IApplicationConfiguration>()
.To<ApplicationConfiguration>();
}
}
应用配置
public class ApplicationConfiguration : IApplicationConfiguration
{
.
.
.
.
}
我使用 Ninject 作为我的依赖注入(inject)框架。任何建议表示赞赏。
编辑:完整代码可以在这里看到: https://github.com/dibley1973/Dibware.Template.Presentation.Web
最佳答案
您无法避免在 Application_PostAuthenticateRequest
中调用 DI 容器或对其进行抽象,但这应该不是问题,因为此 Application_PostAuthenticateRequest
可以被认为是你的一部分 Composition Root .或者换句话说:你必须在某个地方解决它。
但是,您的问题是此方法包含大量代码,而真正的问题是您缺少抽象。要解决此问题,请将此方法的所有逻辑提取到一个新类中并将其隐藏在抽象后面。剩下的就是下面的代码:
protected void Application_PostAuthenticateRequest(Object sender, EventArgs e)
{
var provider = (IPostAuthenticateRequestProvider)
DependencyResolver.Current.GetService(typeof(IPostAuthenticateRequestProvider));
provider.ApplyPrincipleToCurrentRequest();
}
代码可以由您的 DI 容器构建,并将具有以下签名:
public class MvcPostAuthenticateRequestProvider : IPostAuthenticateRequestProvider
{
private readonly IApplicationConfiguration configuration;
public MvcPostAuthenticateRequestProvider(IApplicationConfiguration configuration)
{
this.configuration = configuration;
}
public void ApplyPrincipleToCurrentRequest()
{
// ...
}
}
关于c# - 在这种情况下我如何不使用 DependencyResolver.Current.GetService(...),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/23730159/