Occurs before the action method is invoked.
Namespace:  System.Web.Http.Filters
Assembly:  System.Web.Http (in System.Web.Http.dll)
Syntax
'Declaration
Public Overridable Sub OnActionExecuting ( _
    actionContext As HttpActionContext _
)
'Usage
Dim instance As ActionFilterAttribute
Dim actionContext As HttpActionContext
instance.OnActionExecuting(actionContext)
public virtual void OnActionExecuting(
    HttpActionContext actionContext
)
public:
virtual void OnActionExecuting(
    HttpActionContext^ actionContext
)
abstract OnActionExecuting : 
        actionContext:HttpActionContext -> unit 
override OnActionExecuting : 
        actionContext:HttpActionContext -> unit 
public function OnActionExecuting(
    actionContext : HttpActionContext
)
Parameters
- actionContext
 Type: System.Web.Http.Controllers.HttpActionContext
 The action context.