如何在Asp.net MVC中获取控制器的名称？

string controller = ViewContext.RouteData.Route.GetRouteData(this.Context).Values["controller"].ToString();
string controller = ViewContext.RouteData.Values["controller"].ToString();

string controller = RouteData.Route.GetRouteData(this.HttpContext).Values["controller"].ToString(); 
string controller = RouteData.Values["controller"].ToString(); 

/// <summary>
/// 验证权限，用于检查用户是否已经登录（action执行前会先执行这里）
/// </summary>
/// <param name="filterContext"></param>
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
base.OnActionExecuting(filterContext);
 string controller = filterContext.RouteData.Values["controller"].ToString(); 
controller = controller + "Controller";
}

/// <summary>
/// 获取当前页面的Controller全名称
/// </summary>
/// <returns></returns>
public string GetCurrentController()
{
string controller = HttpContext.Current.Request.RequestContext.RouteData.Values["controller"].ToString();
if (!string.IsNullOrWhiteSpace(controller))
{
controller = controller + "Controller";
}
else
{
controller = "";
}
return controller;
}