You can return null. MVC will detect that and return an EmptyResult. MSDN: EmptyResult represents a result that doesn’t do anything, like a controller action returning null Source code of MVC. public class EmptyResult : ActionResult { private static readonly EmptyResult _singleton = new EmptyResult(); internal static EmptyResult Instance { get { return _singleton; } … Read more
Please note that the SignalR API has changed multiple times since this question was asked. There is a chance that some answers will become out of date. This does not mean that they should be down-voted as they were correct at the time of writing There is another updated answer for this, as seen in … Read more
JSF 1.0 / 1.1 Just put the desired logic in the constructor of the request scoped bean associated with the JSF page. public Bean() { // Do your stuff here. } JSF 1.2 / 2.x Use @PostConstruct annotated method on a request or view scoped bean. It will be executed after construction and initialization/setting of … Read more
This was covered in Railscast episode 38. Using the params hash to detect which button was clicked is the correct approach: View: <%= submit_tag ‘Create’ %> <%= submit_tag ‘Create and Add Another’, name: ‘create_and_add’ %> Controller: if params[:create_and_add] # Redirect to new form, for example. else # Redirect to show the newly created record, for … Read more
They’re also handy for refactoring switch statements. Take the following (albeit simple) example: public void Move(int distance, Direction direction) { switch (direction) { case Direction.Up : Position.Y += distance; break; case Direction.Down: Position.Y -= distance; break; case Direction.Left: Position.X -= distance; break; case Direction.Right: Position.X += distance; break; } } With an Action delegate, you … Read more
The advent of Action and Func family of delegates has rendered custom delegates less used, but the latter still finds uses. Advantages of custom delegates include: As others have pointed, conveys intent clearly unlike generic Action and Func (Patrik has a very good point about meaningful parameter names). You can specify ref/out parameters unlike the … Read more
debug module support array, so you can do like this: debug: msg: – “First line” – “Second line” The output: ok: [node1] => { “msg”: [ “First line”, “Second line” ] } Or you can use the method from this answer: In YAML, how do I break a string over multiple lines?
Security models are a large (and open) field of research. There’s a huge array of models available to choose from, ranging from the simple: Lampson’s Access control matrix lists every domain object and every principal in the system with the actions that principal is allowed to perform on that object. It is very verbose and … Read more
If you know what parameter you want to pass, take a Action<T> for the type. Example: void LoopMethod (Action<int> code, int count) { for (int i = 0; i < count; i++) { code(i); } } If you want the parameter to be passed to your method, make the method generic: void LoopMethod<T> (Action<T> code, … Read more
The route engine uses the same sequence as you add rules into it. Once it gets the first matched rule, it will stop checking other rules and take this to search for controller and action. So, you should: Put your specific rules ahead of your general rules(like default), which means use RouteTable.Routes.MapHttpRoute to map “WithActionApi” … Read more