ShaneKm ShaneKm - 8 months ago 92
C# Question

ControllerDescriptor FindAction returns null

controller:

[HttpDelete]
public ActionResult Delete(int id)
{
}


method:

ControllerBase controllerToLinkTo = string.IsNullOrEmpty(controllerName)
? htmlHelper.ViewContext.Controller
: GetControllerByName(htmlHelper, controllerName);

var controllerContext = new ControllerContext(htmlHelper.ViewContext.RequestContext, controllerToLinkTo);
var controllerDescriptor = new ReflectedControllerDescriptor(controllerToLinkTo.GetType());
ActionDescriptor actionDescriptor = controllerDescriptor.FindAction(controllerContext, actionName);


ActionDescriptor is null when an action has [Delete] attribute. Is there a way to get Action Name from controller context?

Answer Source

I had the same problem in .net 4.5, because the FindAction method only search the get attributes. I resolved the problem adding a second search with the GetCanonicalActions method.

ControllerBase controllerToLinkTo = string.IsNullOrEmpty(controllerName)
                                                        ? htmlHelper.ViewContext.Controller
                                                        : GetControllerByName(htmlHelper, controllerName);

var controllerContext = new ControllerContext(htmlHelper.ViewContext.RequestContext, controllerToLinkTo);
var controllerDescriptor = new ReflectedControllerDescriptor(controllerToLinkTo.GetType());
var actionDescriptor = controllerDescriptor.FindAction(controllerContext, actionName);

//add the following lines
if (actionDescriptor == null)
{
    actionDescriptor = controllerDescriptor.GetCanonicalActions().FirstOrDefault(a => a.ActionName == actionName);
}

Note: I use the linq method FirstOrDefault, so rember add using System.Linq;

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