Controller.OnActionExecuting Method

Called before the action method is invoked.

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

Syntax

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

protected virtual void OnActionExecuting(
    ActionExecutingContext filterContext
)

protected:
virtual void OnActionExecuting(
    ActionExecutingContext^ filterContext
)

Parameters

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

Remarks

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.

Examples

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

protected override void OnActionExecuting(ActionExecutingContext ctx) {
    base.OnActionExecuting(ctx);
    ctx.HttpContext.Trace.Write("Log: OnActionExecuting",
         "Calling " +
         ctx.ActionDescriptor.ActionName);
}

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

See Also

Reference

Controller Class

System.Web.Mvc Namespace