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Controller.OnActionExecuting Method

.NET Framework 4

Called before the action method is invoked.

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

'Declaration
Protected Overridable Sub OnActionExecuting ( _
	filterContext As ActionExecutingContext _
)

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.

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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