ControllerDescriptor FindAction返回null

Question

控制器:

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

方法:

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);

当操作具有[Delete]属性时,ActionDescriptor为null.有没有办法从控制器上下文获取操作名称？

Answer 1

我在.net 4.5中遇到了同样的问题,因为FindAction方法只搜索get属性.我解决了使用GetCanonicalActions方法添加第二次搜索的问题.

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);
}

注意:我使用linq方法FirstOrDefault,所以rember add using System.Linq;