castle-windsor – 如何在ASP.NET 4 RC WebAPI中将依赖注入到动

另一种可能性是使用标记属性：

public class MyActionFilterAttribute : Attribute 
{ 

}

然后使用构造函数注入动作过滤器：

public class MyActionFilter : ActionFilterAttribute
{
    private readonly IFoo _foo;
    public MyActionFilter(IFoo foo)
    {
        _foo = foo;
    }

    public override void OnActionExecuting(HttpActionContext actionContext)
    {
        if (actionContext.ActionDescriptor.GetCustomAttributes<MyActionFilterAttribute>().Any())
        {
            // The action is decorated with the marker attribute => 
            // do something with _foo
        }
    }
}

然后在Application_Start中将其注册为全局操作过滤器：

IFoo foo = ....
GlobalConfiguration.Configuration.Filters.Add(new MyActionFilter(foo));