/// <summary>
/// Temporarily switches the "controller" route value within the current ControllerContext when calling the FindView/FindPartial methods.
/// The "controller" value is changed to a path based on the controller name and namespace.
///
/// This allows us to use the existing view finding functionality, with multiple folders (based on controller namespace) instead
/// of a single folder based on the controller name only.
///
/// Internally, ViewEngines that inherit from VirtualPathProviderViewEngine cache the result of finding views. The cache
/// key is generated from the "controller" value. Using the full controller path allows separate views to be cached,
/// supporting situations where we have the same controller name in different namespaces.
/// </summary>
private ViewEngineResult FindUsingControllerPath(ControllerContext controllerContext, Func <ViewEngineResult> func)
{
string _controllerName = controllerContext.RouteData.GetRequiredString("controller");
string _controllerPath = controllerPathResolver.GetPath(controllerContext.Controller.GetType());
controllerContext.RouteData.Values["controller"] = _controllerPath;
var _result = func();
controllerContext.RouteData.Values["controller"] = _controllerName;
return(_result);
}