Controller.OnActionExecuting Method

Called before the action method is invoked.

Namespace:  System.Web.Mvc
Assembly:  System.Web.Mvc (in System.Web.Mvc.dll)

C#
C++
JScript
VB
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'Declaration
Protected Overridable Sub OnActionExecuting ( _
	filterContext As ActionExecutingContext _
)
'Usage
Dim filterContext As ActionExecutingContext

Me.OnActionExecuting(filterContext)

Parameters

filterContext
Type: System.Web.Mvc.ActionExecutingContext
Information about the current request and action.

If this method is overridden in a derived Controller class, it will be called for every action method in the class. For more flexibility, derive a class from ActionFilterAttribute and override this method in the derived ActionFilterAttribute class.

The following example shows how to write trace information for the action name before the action method runs.

C#
VB
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Protected Overloads Overrides Sub OnActionExecuting(ByVal ctx As ActionExecutingContext) 
    MyBase.OnActionExecuting(ctx) 
    ctx.HttpContext.Trace.Write("Log: OnActionExecuting", "Calling " & ctx.ActionDescriptor.ActionName) 
End Sub
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