Post-process the HTML output of an action in ASP.NET MVC

May 5, 2015, (updated on December 16, 2015), 2 comments, Software Development

This article shows how to implement a post-processor for an ASP.NET MVC application, which transforms the output of an controller action before it is transmitted to the client. The obvious way to do this is by implementing a custom action filter. First, we implement the base filter class: public abstract class OutputProcessorActionFilterAttribute : ActionFilterAttribute { protected abstract string Process(string data); public override void OnResultExecuted(ResultExecutedContext filterContext) { var response = filterContext.HttpContext.Response; response.Filter = new OutputProcessorStream(response.Filter, Process); } } As you can see in the OnResultExecuted method, the response’s current Filter property is wrapped by a new stream implementation. Using this interceptor […] Read more...

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ASP.NET MVC: How to implement an edit form for an entity with a sortable child collection

March 30, 2015, (updated on June 10, 2015), 20 comments, Software Development

This article shows how to implement the edit form for an entity with a collection property. As a show case, we will implement the edit form for a person entity with multiple addresses. The following diagram shows the UML diagram of the two entity classes: The final edit form for a person entity should look like this: The goal is to implement this form so that the address items are sortable and validated directly on the page. The article describes how to implement the described edit form in a simple way with as little as possible lines of code. The […] Read more...

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How to implement and register a custom dependency resolver in ASP.NET MVC 5

March 6, 2015, (updated on March 26, 2015), Software Development

The ASP.NET MVC 5 framework supports the integration of 3rd party dependency injection frameworks. This can be done by implementing the IDependencyResolver interface and registering an instance of the interface on application startup. The registration is made in the Application_Start method which can be found in the Global.asax.cs file: protected void Application_Start() { ... var compositionContext = new CompositionContext(); compositionContext.AddPart<IMyService, MyServiceImpl>(); // TODO: Register your own services here DependencyResolver.SetResolver(new MyDependencyResolver(compositionContext)); } Most dependency injection frameworks provide a NuGet package which already contains an IDependencyResolver implementation (for example Ninject.MVC3). However, because I wanted to use the IoC container from my own […] Read more...

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