https://blog.tedd.no/Notes on software, systems, and the details that make them work. C#, .NET, performance, and engineering by Tedd.enhttps://blog.tedd.no/2022/03/07/unsafe-reference-arithmetic-in-net/https://blog.tedd.no/2022/03/07/unsafe-reference-arithmetic-in-net/Mon, 07 Mar 2022 22:14:31 GMTA closer look at CompilerServices.Unsafe as the modern alternative to the fixed statement: doing reference arithmetic on GC-managed memory without pinning, what "unsafe" really means, and what the CLR does and doesn't promise you.C#Performance.NETMSILhttps://blog.tedd.no/2021/10/07/why-c-multidimensional-arrays-are-slow/https://blog.tedd.no/2021/10/07/why-c-multidimensional-arrays-are-slow/Thu, 07 Oct 2021 14:37:44 GMTint[,] looks like the natural choice and performs like the wrong one. Digging into IL and JIT output to show what actually happens when you access single-dimensional, multidimensional and jagged arrays — and why the rectangular one loses.C#PerformanceMSILBenchmarkhttps://blog.tedd.no/2020/06/01/faster-c-array-access/https://blog.tedd.no/2020/06/01/faster-c-array-access/Mon, 01 Jun 2020 15:18:48 GMTEvery array access in .NET pays for a bounds check — unless you convince the compiler it can skip it. I read the JIT'ed x64 assembly and benchmark tricks that make plain array access 18-34% faster.C#PerformanceMSILBenchmarkhttps://blog.tedd.no/2020/05/24/automatic-unlock-qnap-volumes-from-network/https://blog.tedd.no/2020/05/24/automatic-unlock-qnap-volumes-from-network/Sun, 24 May 2020 09:58:02 GMTEncrypted QNAP volumes protect against stolen hardware, but someone must enter the key after every power loss. This BASH script in a cron job on another machine logs in, finds locked volumes and unlocks them automatically — security without the 3AM wake-up.AdminEncryptionStorageLinuxhttps://blog.tedd.no/2020/05/07/demystifying-async-await/https://blog.tedd.no/2020/05/07/demystifying-async-await/Thu, 07 May 2020 18:44:19 GMTAsync/await looks simple and is widely misunderstood — I have seen entire conference talks get it wrong. A trip down the rabbit hole with examples (and memes) of what the compiler actually does: no, async does not create a thread.C#Async.NEThttps://blog.tedd.no/2020/04/13/recompress-zip-files-powershell/https://blog.tedd.no/2020/04/13/recompress-zip-files-powershell/Mon, 13 Apr 2020 10:32:27 GMTA PowerShell script that recursively re-compresses ZIP files with 7-Zip at maximum settings (Deflate64), reporting how much space each file saved.PowerShellCompressionTipshttps://blog.tedd.no/2019/06/25/asp-net-core-typescript/https://blog.tedd.no/2019/06/25/asp-net-core-typescript/Tue, 25 Jun 2019 10:20:06 GMTPart of my ASP.NET Core recipe series: compiling TypeScript as part of the project so the frontend gets types too.ASP.NET CoreTypeScriptASP.NEThttps://blog.tedd.no/2019/06/25/asp-net-core-memory-cache/https://blog.tedd.no/2019/06/25/asp-net-core-memory-cache/Tue, 25 Jun 2019 10:05:53 GMTPart of my ASP.NET Core recipe series: using the built-in memory cache for data you don't want to fetch on every request.ASP.NET CoreC#ASP.NEThttps://blog.tedd.no/2019/06/25/asp-net-core-response-cache/https://blog.tedd.no/2019/06/25/asp-net-core-response-cache/Tue, 25 Jun 2019 10:00:31 GMTPart of my ASP.NET Core recipe series: enabling response caching so identical requests are served without re-executing the pipeline.ASP.NET CoreC#ASP.NEThttps://blog.tedd.no/2019/06/20/asp-net-core-automapper/https://blog.tedd.no/2019/06/20/asp-net-core-automapper/Thu, 20 Jun 2019 11:35:22 GMTPart of my ASP.NET Core recipe series: wiring up AutoMapper to map between entities and view/API models without hand-written copy code.ASP.NET CoreC#ASP.NEThttps://blog.tedd.no/2019/06/20/ef-core-in-separate-project/https://blog.tedd.no/2019/06/20/ef-core-in-separate-project/Thu, 20 Jun 2019 11:30:36 GMTPart of my ASP.NET Core recipe series: moving EF Core into its own project so the data layer stays separated from the web application.ASP.NET CoreEF CoreC#ASP.NEThttps://blog.tedd.no/2019/06/20/asp-net-core-api-with-swagger-ui/https://blog.tedd.no/2019/06/20/asp-net-core-api-with-swagger-ui/Thu, 20 Jun 2019 11:25:08 GMTPart of my ASP.NET Core recipe series: exposing your API with Swagger UI so it documents and exercises itself.ASP.NET CoreC#ASP.NEThttps://blog.tedd.no/2019/06/20/asp-net-core-api-versioning/https://blog.tedd.no/2019/06/20/asp-net-core-api-versioning/Thu, 20 Jun 2019 10:20:08 GMTPart of my ASP.NET Core recipe series: adding API versioning so /api/v1/ and /api/v2/ can coexist while clients migrate at their own pace.ASP.NET CoreC#ASP.NEThttps://blog.tedd.no/2019/06/20/asp-net-core-mvc-with-api-area/https://blog.tedd.no/2019/06/20/asp-net-core-mvc-with-api-area/Thu, 20 Jun 2019 10:15:34 GMTPart of my ASP.NET Core recipe series: carving out an /api/-area in an MVC project so pages and API endpoints live cleanly side by side.ASP.NET CoreC#MVCASP.NEThttps://blog.tedd.no/2019/06/20/asp-net-core-managed-config/https://blog.tedd.no/2019/06/20/asp-net-core-managed-config/Thu, 20 Jun 2019 10:10:03 GMTPart of my ASP.NET Core recipe series: binding appsettings.json to typed config classes so settings are managed code instead of magic strings.ASP.NET CoreC#ConfigurationASP.NEThttps://blog.tedd.no/2019/06/20/asp-net-core-logging-with-serilog/https://blog.tedd.no/2019/06/20/asp-net-core-logging-with-serilog/Thu, 20 Jun 2019 10:05:15 GMTPart of my ASP.NET Core recipe series: replacing the default logging with Serilog for structured logs with proper sinks.ASP.NET CoreC#ASP.NEThttps://blog.tedd.no/2019/06/20/asp-net-core-mvc/https://blog.tedd.no/2019/06/20/asp-net-core-mvc/Thu, 20 Jun 2019 10:00:19 GMTThe opening recipe in my ASP.NET Core series: setting up a clean MVC project as the foundation the rest of the recipes build on.ASP.NET CoreC#MVCASP.NEThttps://blog.tedd.no/2019/05/07/extension-support-for-net-core-application/https://blog.tedd.no/2019/05/07/extension-support-for-net-core-application/Tue, 07 May 2019 14:19:25 GMTPlugins for a .NET Core app boil down to loading .dlls at runtime, finding the interesting interfaces and registering them in IoC. Since IoC already gives you loose coupling, dynamic loading is a small step — shown here..NET CoreC#https://blog.tedd.no/2019/05/07/net-core-console-application-ioc/https://blog.tedd.no/2019/05/07/net-core-console-application-ioc/Tue, 07 May 2019 12:31:53 GMTMVC gets IoC boilerplate generated for free; console apps don't. With HostBuilder from the Generic Host it's easy to wire up the same dependency injection, config and logging in a console application — here is the boilerplate..NET CoreC#https://blog.tedd.no/2018/12/30/benchmarking-dynamic-method-invocation-in-net/https://blog.tedd.no/2018/12/30/benchmarking-dynamic-method-invocation-in-net/Sun, 30 Dec 2018 12:21:59 GMTInterface, base class, virtual, override, dynamic, reflection or expression trees — .NET gives you many ways to call a method, and their costs differ wildly. Full benchmark with numbers for each.C#BenchmarkPerformanceMSILhttps://blog.tedd.no/2018/12/22/building-a-voxel-engine-part-2/https://blog.tedd.no/2018/12/22/building-a-voxel-engine-part-2/Sat, 22 Dec 2018 15:34:11 GMTPart 2 of the voxel engine introduction: turning chunk data into renderable polygon meshes in Unity, one Mesh per chunk, and only drawing the faces that can actually be seen.UnityGame DevelopmentC#https://blog.tedd.no/2018/12/22/building-a-voxel-engine-part-1/https://blog.tedd.no/2018/12/22/building-a-voxel-engine-part-1/Sat, 22 Dec 2018 15:31:45 GMTMy Christmas vacation project: a basic introduction to voxel engines à la Minecraft. Part 1 covers what voxels are, polygon meshes, and how to represent a voxel world in memory without hitting limits.UnityGame DevelopmentC#https://blog.tedd.no/2018/12/08/code-sharing-between-vs-and-unity-3d/https://blog.tedd.no/2018/12/08/code-sharing-between-vs-and-unity-3d/Sat, 08 Dec 2018 16:37:57 GMTUnity happily lets you write C# but not structure it. Four ways to share code between proper Visual Studio projects and Unity — so your libraries stay testable and your Unity project stops being a big ball of mud.UnityVisual StudioC#.NEThttps://blog.tedd.no/2018/06/20/setting-up-new-net-projects/https://blog.tedd.no/2018/06/20/setting-up-new-net-projects/Wed, 20 Jun 2018 10:13:33 GMTAfter ~30 years and a few thousand projects, this is how I set up new .NET solutions: naming, project structure, .NET Standard vs Core choices — and the reasoning behind each habit. Not a book on architecture, just a clean, consistent setup..NETC#Visual StudioASP.NEThttps://blog.tedd.no/2018/03/18/sizeof-vs-marshal-sizeof/https://blog.tedd.no/2018/03/18/sizeof-vs-marshal-sizeof/Sun, 18 Mar 2018 23:12:00 GMTsizeof() compiles to a constant; Marshal.SizeOf() measures the marshaled struct at runtime. What each one really returns, what it costs, and when to use which — with IL to prove it.C#MSILBenchmarkhttps://blog.tedd.no/2018/01/17/cost-of-method-wrapper/https://blog.tedd.no/2018/01/17/cost-of-method-wrapper/Wed, 17 Jan 2018 00:08:56 GMTWhat does a method that just calls another method actually cost? Using the == operator vs IEquatable.Equals as the guinea pig, I benchmark wrapper calls across compilers, JITs and runtimes — and read the disassembly to see why.C#MSILBenchmarkPerformancehttps://blog.tedd.no/2018/01/13/speeding-up-unitys-vector-in-lists-dictionaries/https://blog.tedd.no/2018/01/13/speeding-up-unitys-vector-in-lists-dictionaries/Sat, 13 Jan 2018 12:40:08 GMTUnity's Vector2/3/4 and Quaternion lack IEquatable and have a poor GetHashCode, which quietly murders performance the moment you put them in lists or dictionaries. Measurements, explanation, and the fix I reported to Unity.UnityC#PerformanceBenchmarkhttps://blog.tedd.no/2017/10/30/simple-app-config-appsettings-deserializer-with-tree-structure/https://blog.tedd.no/2017/10/30/simple-app-config-appsettings-deserializer-with-tree-structure/Mon, 30 Oct 2017 23:54:56 GMTReading appSettings shouldn't require custom sections, XML readers or per-access string conversion. A small base class that maps keys like Config.SmtpClient.Host to a typed tree, converted once at startup.C#Configurationhttps://blog.tedd.no/2017/09/26/automatic-class-generator-for-csvhelper/https://blog.tedd.no/2017/09/26/automatic-class-generator-for-csvhelper/Tue, 26 Sep 2017 13:16:45 GMTCsvHelper is great, but writing the model and mapper classes is tedious. Paste your CSV header on this page and it generates both classes for you.C#Toolshttps://blog.tedd.no/2017/05/09/iis-redirect-http-to-https-but-allow-lets-encrypt/https://blog.tedd.no/2017/05/09/iis-redirect-http-to-https-but-allow-lets-encrypt/Tue, 09 May 2017 16:11:14 GMTRedirecting all HTTP to HTTPS in IIS breaks Let's Encrypt's renewal challenge. Two URL Rewrite rules fix it: let .well-known through, redirect everything else.IISSecurityAdmin