ASP.NET MVC

ASP.NET Core and MVC 6 Lessons Learned

I recently finished a small website using ASP.NET Core and MVC 6 - I only scratched the surface of the framework, but here's some gotchas and things I picked up along the way.

A Generic, IDisposable, Unit-Testable, Error-Handling WCF Service Client

I recently reused my generic, disposable WCF service client, and made some changes to make it simpler to use and easier to unit test. Here's what I did.

GetValueOrDefault() For An Expression of Arbitrary Length Using Expression Trees

In my most recent project we had to support classes with fairly deep object graphs where any of the nodes could validly be null. We didn't want to have lots of 'if not null' checks everywhere, so I wrote an extension method which takes an expression of any length and returns the expression value or a default value if any of the nodes are null. Here's the extension method code, along with an overview of how it works.

Extending WatiN 3: Detecting if a PDF Has Opened In a New Window

WatiN lets you attach to browser windows so you can verify their contents and close them as part of your tests, but the standard API doesn't detect windows with PDF documents in them. Here's an extension method which does.

Extending WatiN 2: Wait for JQuery document.ready() Functions to Complete

WatiN's DomContainer.WaitForComplete() method pauses test execution until the DOM has finished loading, but if your page has functions registered with JQuery's ready() function, you'll probably want to wait for those to finish executing before testing it. Here's a WatiN extension method which pauses test execution until that happens.

No More NCrunch For Me

NCrunch is a Visual Studio add-in which runs your tests while you work so you know if you've broken anything, as well as providing coverage indicators in the IDE and coverage metrics on demand. It recently went commercial, and time is running out for the free version I've been using for the last couple of months. From my experiences using NCrunch I'm going to let it expire, and go about my business without it. Here's why.

Unobtrusive Maximum Input Lengths with JQuery and FluentValidation

JQuery unobtrusive validation can be used to show an error message when the user inputs too many characters or a numeric value which is too big. On a recent project we wanted to use input's maxlength attribute to prevent a user from entering too many characters rather than cure the problem with an error message - here's how we did it.

Extending WatiN: Useful Extension Methods

I've been doing a fair amount of UI testing using WatiN recently – here’s some extension methods I've found useful.

A Generic, IDisposable WCF Service Client

WCF clients need to be cleaned up properly, but as they're usually auto-generated they don't implement IDisposable. I've been doing a fair bit of WCF work recently, so I wrote a generic WCF client wrapper which effectively gives me a disposable service client.

Fixing Chrome’s AJAX Request Caching Bug

I recently had to make a set of web pages restore their state when the user arrived on them after clicking the browser’s back button. I used JQuery's ajax function to get the data, but even with JQuery's cache: false setting and MVC's OutputCache attribute, Chrome insisted on retrieving it from its cache. Here's how I solved the problem.

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