#c#

Full-stack static typing with OpenAPI TypeScript and Microsoft.AspNetCore.OpenApi

This post will show you how to write full stack applications with static typing from back to front using OpenAPI, TypeScript and .NET.

Keeping front end and back end in sync with NSwag generated clients

By generating clients from OpenAPI specs, it is possible to have integration tests that check your front end and your back end are aligned. This post will show you how to do that using NSwag.

Serialising ASP.NET method calls for later execution

How can we take a method call, serialise it, perhaps store it in a database, and then later rehydrate and execute?

Large Language Models, Open API, View Models and the Backend for Frontend Pattern

To integrate LLMs with APIs, there is a need for the LLM equivalent of view models and the backend for frontend pattern. This discusses it in the context of Semantic Kernel.

Using Kernel Memory to Chunk Documents into Azure AI Search

To build RAG (Retrieval Augmented Generation) experiences, where LLMs can query documents, you need a strategy to chunk those documents. Kernel Memory supports this.

Azure Cosmos DB: container items and generics

Learn how to use generics to store and retrieve different types of object in an Azure Cosmos DB Container. And how to deserialize the data property into a C# object of a specific type.

Snapshot log tests in .NET

This post demonstrates how to write high quality and low effort log assertions using snapshot testing.

Graph API: getting users Active Directory group names and ids with the C# SDK

Learn how to get the Azure Active Directory group names and ids from the Graph API using the C# SDK.

Reverse engineering the Azure Application Insights Transactions URL

This post reverse engineers the Azure Application Insights Transactions URL, showing how to make a link href, using both TypeScript and C#.

ESLint your C# in VS Code with Roslyn Analyzers

ESLint provides linting for TypeScript and JavaScript in VS Code. A similar experience is available for C# in VS Code through Roslyn Analyzers.

NSwag generated C# client: Open API property name clashes and decimal types rather than double

Generate C# and TypeScript client libraries from OpenAPI / Swagger definitions using NSwag while overcoming language conflicts and numeric types.

Directory.Build.props: C# 9 for all your projects

Learn how to use C# 9 with .NET Core by creating a `Directory.Build.props` file. All projects in the solution will support C#9 with no further steps.

C# 9 in-process Azure Functions

Learn to use C# 9 with .NET Core 3.1 Azure Functions in this step-by-step guide by adding new elements to your .csproj file.

NSwag: TypeScript and CSharp client generation based on an API

NSwag simplifies APIs by auto-generating OpenAPI specs and clients. Learn to create TypeScript clients from NSwag using a .NET console app.

Nullable reference types; CSharp's very own strictNullChecks

C# introduces nullable reference types similar to TypeScripts `strictNullChecks`. Enabling raises warnings and solves null reference risks.

Task.WhenAll / Select is a footgun 👟🔫

The writer warns against LINQ code that causes concurrent API requests and shares plans for better metrics and a development container.

Snapshot Testing for C#

Snapshot testing is an efficient test technique for comparing outputs with JSON. Its applicable to C# too, using Fluent Assertions and a helper tool.

Drifting away from .Net

Flexibility Through Immutability, part 2: How and When?

Flexibility Through Immutability, part 1: Why?

Flexibility Through Immutability

Concatting IEnumerables in C#

Author proposes clean alternatives to `IEnumerable`s concatenation which entail creating custom extensions & using nulls for null-conditional operator.

TFS 2012, .NET 4.5 and C# 6

Use C# 6 features on .NET 4.5 with Visual Studio 2015, set MSBuild Arguments and install Microsoft.Net.Compilers on the old build server.

IQueryable... IEnumerable... Hmmm...

The debate surrounding passing IQueryable<T> as IEnumerable<T> is discussed. Changing the method signature is proposed as a solution.

(Top One, Nice One) Get Sorted

John creates a way to use .NETs LINQ feature to sort JavaScript arrays. The tools allow sorting by one or more criteria.

Getting up to speed with Bloomberg's Open API...

John documents his experience investigating Bloombergs Open API. He includes a simple C# console application wrapper for the API.

Giving OData to CRM 4.0

The article explains how to create an OData service to access Dynamics CRM 4.0 by using LINQ to CRM provider and WCF Data Services.

ClosedXML - the real SDK for Excel

Closed XML simplifies Excel document creation for developers with its straightforward API, sitting on top of Open XML. A frustration-solver for many!

Making PDFs from HTML in C# using WKHTMLtoPDF

Create PDF reports from HTML with WKHTMLtoPDF, an open source tool that renders web pages to PDF, using a simple wrapper class.

JavaScript - getting to know the beast...

Discovering jQuery and advice from Elijah Manor and Douglas Crockford changes Johns initial dislike of JavaScripts quirks.