Vaughan

What is AyncLocal in C#?

.NET Core

An interesting class that is useful to know about but you most probably won’t directly use is AsyncLocal. It stores data local to the async flow. This means that if a method further down the chain changes the underlying value, the change will only apply to that and its children. A potential use case might […]

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Vaughan

Why you should start using property based testing

.NET Core, Testing

I recently watched a talk on Property-based testing and its a really interesting approach. When we write a unit test we generally use what they call example based testing. What this means is that we create an expected response and run our test to confirm that the function returns that response. Its great but the […]

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Vaughan

Classifying tweet sentiment with ML.NET

.NET Core, MachineLearning, ML.NET

Following from my previous post on getting paged data from twitter, I thought it would be fun to use ML.NET to do a little analysis. A common problem solved with machine learning is doing sentiment analysis on text to evaluate how positive or negative something is. To solve this problem with ML.NET really isn’t that […]

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Vaughan

Consuming paged Twitter data with async enumerable

.NET Core

A really nice feature in C# 8 is async enumerables. A popular use case is if you want to consume paged data and potentially aggregate each page of data without having to get everything first. Previously the consuming code would have to handle the paging but now your method can just enumerate over the IAsyncEnumerable […]

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Vaughan

Creating an AWS Lambda function written in C# .NET Core

.NET Core, AWS

With more and more companies moving to the cloud, the idea of serverless execution of your code has more and more appeal. AWS has Lambda and Azure has Functions. The idea is the same: You give them a method that you want to execute and the provider works out the scaling. As you get more […]

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Vaughan

ASP.NET Core integration tests with WebApplicationFactory

.NET Core, Testing

We all agree that we want to have tests that cover as much of our application as possible. Right? The general approach with ASP.NET applications has been to extract meaningful business logic out of your controllers. Pretty much everything that needs to be tested would be injected with an interface so that its easy to […]

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Vaughan

Performance with ref readonly returns

.NET Core

When looking at performance of an application, there is a trade off between when you should be using value types and when you should be using reference types. People often talk about minimizing allocations to the heap for reference types but allocations themselves are actually very quick. The reason why its an issue is that […]

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Vaughan

Understanding default interface members in .NET Core

.NET Core

A new feature in C# 8.0 and .NET Core 3.0 is that of default interface members. The motivation for it is where authors of a public interface would like to add functionality to an existing interface but don’t want to force all the consuming code to implement it. You are able to add a default […]

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Vaughan

Using the new Index and range operators

.NET Core

A great C# feature that was recently released is the new Index and Range operators. Two new system objects were created to make accessing elements or range of elements in arrays shorter and more convenient. Index You can now index an array from the end of the array instead of using Array.Length. To be honest, […]

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Vaughan

A case for pattern matching

.NET Core

Over the years developers using more functional languages like F# have boasted about how much easier their code is to read and how imperative C# can be. NO LONGER! Well maybe not much longer. We are starting to move in the right direction with pattern matching as a good replacement for switch statements. switch statements […]

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