apis

REST API Development in C# Articles, Tutorials & News

REST API Development in C# articles, tutorials, and news from the DotNetNews archive.

150 articles Updated Nov 01, 2026

REST API in C# is the focus of this topic page. REST API Development in C# is a recurring focus for C# and .NET developers working in the Microsoft ecosystem. Intermediate and senior .NET developers use this hub to scan practical writing without treating every link as an endorsement.

Recurring subtopics in recent issues include REST API in C#, REST API ASP.NET Core, RESTful API .NET, and HTTP API C#. Those themes are drawn from titles and excerpts in the newest archive entries for this tag, not from a marketing outline.

Expect publisher tutorials, release notes, architecture write-ups, and field notes linked from DotNetNews issues. Start here is a short editorial shortlist for REST API Development in C#; the archive list is chronological and larger. Secondary angles such as REST API in C# and REST API ASP.NET Core appear when the archive actually covered them. Nearby reading often overlaps with ASP.NET Core Web API and ASP.NET Core Minimal APIs.

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Archive

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How to Mock External HTTP APIs in .NET Integration Tests

C# Corner Oct 30, 2026 Issue #574

Learn how to mock external HTTP APIs in .NET integration tests with a custom HttpMessageHandler, HttpClient, and xUnit to test successful and error responses reliably.

Unit Testing xUnit.net

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Unwiring WireMock .NET: Elevate Your API Testing

Medium Oct 30, 2026 Issue #574

Overview: WireMock .NET is a free, open-source C# tool that lets integration tests talk to a simulated API over HTTP instead of real…Continue reading on T.8ytes by Titansoft »

Unit Testing

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C# Concepts Every .NET Backend Developer Should Know in 2026

Medium Oct 29, 2026 Issue #573

A .NET API can feel perfectly fine with a little traffic and then start struggling as the app grows. Queries get slower, outgoing HTTP…

C# Performance

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How to Use ETags in ASP.NET Core to Prevent Users from Overwriting Each Other’s Changes

C# Corner Oct 28, 2026 Issue #572

Learn how to use ETags, If-Match headers, EF Core rowversion columns, and HTTP 412 responses to prevent conflicting updates in ASP.NET Core APIs.

ASP.NET Core EF Core

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How to Add API Versioning to an ASP.NET Core Web API

C# Corner Oct 27, 2026 Issue #571

Learn to add URL-based API versioning to an ASP.NET Core Web API using Asp.Versioning, create v1 and v2 controllers, and preserve compatibility for existing clients.

ASP.NET Core Web API

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How to Add Rate Limiting to ASP.NET Core APIs

C# Corner Oct 26, 2026 Issue #570

Learn how to configure and apply ASP.NET Core rate limiting policies, choose limiter algorithms, and return HTTP 429 responses for excessive API requests.

ASP.NET Core Security

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gRPC vs. REST in .NET: When to Use Which

Medium Oct 26, 2026 Issue #570

Use REST for public, browser-facing, and third-party APIs, and gRPC for internal, high-throughput service-to-service communication. Most…

gRPC

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How to Mock External HTTP APIs in .NET Integration Tests

C# Corner Oct 23, 2026 Issue #569

Learn how to mock external HTTP APIs in .NET integration tests with a custom HttpMessageHandler, including success, error, and not-found response scenarios.

Unit Testing

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How to Mock External HTTP APIs in .NET Integration Tests

C# Corner - Nidhi Sharma Oct 23, 2026 Issue #569

Learn how to mock external HTTP APIs in ASP.NET Core integration tests by replacing HttpMessageHandler for typed HttpClient instances in WebApplicationFactory.

ASP.NET Core Unit Testing

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How to Use ETags in ASP.NET Core to Prevent Users from Overwriting Each Other’s Changes

C# Corner Oct 22, 2026 Issue #568

Learn how to use HTTP ETags, If-Match headers, and EF Core rowversion tokens in ASP.NET Core APIs to detect concurrent edits and prevent lost updates.

ASP.NET Core EF Core

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Designing APIs for AI agents: your API has a new user

elmah.io Blog - .NET Technical tutorials/guides and new features - Ali Hamza Ansari Oct 22, 2026 Issue #568

AI agents are a new kind of API consumer: they call endpoints, retry requests, and chain multi-step workflows on their own. This post covers practical ASP.NET Core patterns for building agent-ready AP...

ASP.NET Core

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Resolving Common Pitfalls in ASP.NET Core Hybrid Projects: APIs, HTML Redirects, and Decimal Parsing

C# Corner - Sardar Mudassar Ali Khan Oct 20, 2026 Issue #566

ASP.NET Core

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Data API builder 2.1.5: JSON and Vector Data Type Support, and More

Microsoft Dev Blogs - Carlos Robles Oct 19, 2026 Issue #565

Data API builder (DAB) 2.1.5 is now available as a stable release, and it is about meeting modern data where it lives: documents next to rows, embeddings next to both. This release brings native suppo...

Azure

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Use ETags in ASP.NET Core to Prevent Lost Updates

C# Corner - Bhavya Singh Oct 19, 2026 Issue #565

Learn how to use ETags, If-Match headers, and EF Core rowversion tokens in ASP.NET Core to detect stale updates and prevent lost data changes.

ASP.NET Core EF Core

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Test Apigee Proxies Locally Before Deploying Them to Google Cloud

C# Corner - Nidhi Sharma Oct 13, 2026 Issue #561

AOT ASP.NET Core Authentication

Read article Issue #561
Launching Calcifer 2.0:

Medium - Rakibul H. Rabbi Oct 12, 2026 Issue #560

Every new API starts with the same chores.

Application Insights ASP.NET Core Azure

Read article Issue #560
Step-by-Step Guide to Create Your First Dataverse Custom API

C# Corner - Arun Potti Oct 09, 2026 Issue #559

ASP.NET Core .NET Aspire Authentication

Read article Issue #559
Committed but Unconfirmed: Handling a Lost Response After a Successful Save

C# Corner - dhana gani Oct 08, 2026 Issue #558

ASP.NET Core .NET Aspire Blazor

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What I Wish I Knew Before Building APIs in ASP.NET Core

Medium - Somnath Mukherjee Oct 05, 2026 Issue #555

Leaked entities, 9-second endpoints, and a breaking change I never saw coming. Here’s what I’d tell my past self.

ASP.NET Core Web API

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The Day One Downstream API Took Down Our Service

Medium - Anirban Banerjee Oct 02, 2026 Issue #554

It started with a few slow API calls.

Performance

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Swagger vs. Scalar: A comparison for ASP.NET Core developers

elmah.io Blog - .NET Technical tutorials/guides and new features - Ali Hamza Ansari Sep 28, 2026 Issue #550

Swagger UI used to ship by default with ASP.NET Core API projects, but recent .NET versions replaced it with a bare OpenAPI document. This post compares Swagger and Scalar as documentation UIs, walks ...

ASP.NET Core

Read article Issue #550
Avoid API Breaking Changes

codeopinion.com Sep 25, 2026 Issue #549

Have you ever changed your backing data model and then all of a sudden all your clients explode? It’s not because you broke your code. You broke your contract. Most times API breaking changes occur be...

Azure Blazor Clean Architecture

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Building More Resilient ASP.NET Core Applications with Http.Resilience

Medium Sep 21, 2026 Issue #545

When your ASP.NET Core application depends on external APIs, temporary failures are inevitable — network glitches, timeouts, 5xx responses…

ASP.NET Core

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GraphQL for Beginners

C# Corner Sep 18, 2026 Issue #544

Learn GraphQL for beginners by comparing it with REST and gRPC, understanding queries, mutations, subscriptions, schemas, over-fetching, under-fetching, N+1 queries, and practical API use cases.

gRPC

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Building Apps That Live Inside Someone Else’s Software

Medium Sep 16, 2026 Issue #542

What we learned building inside Reapit’s AppMarket

Design Patterns

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