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The purpose of this article is to present a fast and lightweight implementation of the CQRS+ES pattern using the C# programming language and the .NET Framework. This implementation is relatively full-featured, including support for SQL Server serialization of commands and events, scheduled commands, snapshots, sagas (i.e., process managers), and plug-and-play overrides for multitenant customization. I will describe how the code is structured, and illustrate how it works with a sample application.
The System.Text.RegularExpressions namespace has been in .NET for years, all the way back to .NET Framework 1.1. It’s used in hundreds of places within the .NET implementation itself, and directly by thousands upon thousands of applications. Across all of that, it represents a significant source of CPU consumption.
I wanted to describe what I do to diagnose memory perf issues, or rather the common part of various work flows of doing such diagnostics. Diagnosing performance issues can take many forms because there’s no fixed steps you follow. But I’ll try to break it down into basic blocks that get invoked for a variety of diagnostics.
Each technology becomes obsolete after some time. It is no different with the .NET Framework – it can be safely said that after the appearance of the .NET Core platform, the old Framework is slowly disappearing. Few people write about this platform, at conferences it has not been heard for a long time in this topic. Nobody starts a project in this technology. Only the .NET Core everywhere… except for a beloved legacy systems!
.NET application is “just” a piece of CIL bytecode to be executed by the .NET runtime. And .NET runtime is “just” a program that is able to perform this task. It happens that currently .NET Framework/.NET Core runtimes are written in C++. I am also fully aware of CoreRT that was .NET runtime with many parts rewritten to C# (like type system) but still, crucial parts (including JIT compiler and the GC) were left written in C++.