Thread safe queues in .NET

July 14, 2015 1 Comment

We saw how standard Queues work in .NET in this post. Queues are first-in-first-out collections where the first element added to the collection will the first to be removed. Queues are ideal to model consumer-producer scenarios where a producer adds items to a queue which are then processed by a consumer in the order they came in.

If you’d like to have a Queue that is shared among multiple threads in a multi-threaded application then the “normal” Queue of T object won’t be enough. You can never be sure of the current state of the queue in the very moment when a certain thread tries to dequeue an item from it. The queue may have been modified by another thread just a millisecond before and then the Dequeue method will fail. In general you should be very careful with how you share the resources among different threads.

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Filed under .NET, C# language features, Task Parallel Library Tagged with , , ,

Building a Web API 2 project from scratch using OWIN/Katana .NET Part 4: async controllers and mini-DDD

July 13, 2015 Leave a comment

Introduction

In the previous post we briefly looked at a new hosting project by Microsoft called Helios. It is meant to be the future of web application deployment where Helios removes the necessity of having the entire System.Web dependency in your web project. We saw that Helios is only in a preview state so it shouldn’t be used for real-life projects yet.

In this post we’ll diverge from OWIN/Katana and instead see how we can add asynchronous controller methods to our current CustomersApi web project. We’ll also build a miniature version of a layered application. We’ll put the layers into separate folders for simplicity.

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Filed under .NET, Async/Parallelism, web api 2, Web optimisation Tagged with ,

How to register a custom HTTP module in your .NET web application

July 10, 2015 2 Comments

You can easily add your custom HTTP module to a .NET web application. Here’s an excerpt from the MSDN article referenced in the previous sentence:

“An HttpModule is an assembly that implements the IHttpModule interface and handles events. ASP.NET includes a set of HttpModules that can be used by your application.”

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Building a Web API 2 project from scratch using OWIN/Katana .NET Part 3: hosting on Helios

July 9, 2015 Leave a comment

Introduction

In the previous post we discussed how to use OWIN host to self-host a Web API 2 application. We saw how easy and straightforward it was to install the OWIN hosting package with NuGet.

In this post we’ll look at another hosting option: Helios.

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Implementing equality for reference objects using IEquatable and the == operator: summary

July 8, 2015 Leave a comment

We have looked at implementing IEquatable and overriding various equality-related methods and operators in various other posts on this blog. You can look at this page and scroll down to the section called “Comparison and equality” to view all of them.

In this post we’ll put all of these together and implement a joined equality strategy for our reference type.

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Thread-safe stacks in .NET

July 7, 2015 3 Comments

We saw how Stacks work in .NET in this post. Stacks are last-in-first-out collections where the last element added to the collection will the first to be removed.

If you’d like to have a Stack that is shared among multiple threads in a multi-threaded application then the “normal” Stack of T object won’t be enough. You can never be sure of the current state of the stack in the very moment when a certain thread tries to pop an item from it. The stack may have been modified by another thread just a millisecond before and then the Pop method will fail. In general you should be very careful with how you share the resources among different threads.

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Building a Web API 2 project from scratch using OWIN/Katana .NET Part 2: OWIN host

July 6, 2015 8 Comments

Introduction

In the previous post we saw how to build a simple Web API from scratch using a couple of OWIN/Katana components. We added a couple of Katana libraries from NuGet, wired up the routing from the Startup class and we were good to go.

In this post we’ll see one way to make the application run independently of IIS. As we stated before an important benefit of this new OWIN infrastructure is that you can make your ASP.NET web application run on multiple hosts, not only IIS. IIS is only one of the options.

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FIFO collections with Queue of T in .NET C#

July 3, 2015 2 Comments

FIFO, that is first-in-first-out, collections are represented by the generic Queue of T class in .NET. Queues are collections where a new element is placed on top of the collection and is removed last when the items are retrieved.

Let’s say that you’re throwing a party where you follow a Queue policy as far as guests are concerned. As time goes by you’d like all of them to leave eventually and the first one to go will be the first person who has arrived. This is probably a most just policy than what we saw in the post on stack collections.

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Filed under .NET, C# language features, Generics Tagged with ,

Building a Web API 2 project from scratch using OWIN/Katana .NET Part 1

July 2, 2015 13 Comments

Introduction

If you’re a .NET developer then you must have come across the new light-weight web framework standard called OWIN. Its implementation by Microsoft in .NET is called Katana. We’ve looked at OWIN/Katana on this blog already starting here. I won’t go through the same exact same topic in this new series. Instead we’ll concentrate on the basic components that are required at a minimum to build a functioning, platform independent Web API 2 project.

If you’ve read other posts on this blog then you’ll know about my preference for web services as opposed to shiny GUI development á la ASP.NET MVC. Also we’ll be looking into other Web API 2 features in OWIN later on so this will be a good foundation.

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How to check whether two HashSets are equal in C# .NET

July 1, 2015 Leave a comment

Two HashSet objects in C# are equal if they contain the same values regardless of their order in the collection.

Consider the following integer sets:

HashSet<int> intHashSetOne = new HashSet<int>()
{
	1,2,6,5,7,5
};

HashSet<int> intHashSetTwo = new HashSet<int>()
{
	2,2,8,5,9,4
};

HashSet<int> intHashSetThree = new HashSet<int>()
{
	6,7,5,5,2,1
};

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Filed under .NET, C# language features, Generics Tagged with , , ,

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