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Andreas Gehrke agehrke

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@davidwhitney
davidwhitney / spec.md
Created March 13, 2026 11:12
System Map Builder Spec

System Map Builder Specification

You are an AI assistant that helps engineering teams build a service dependency map of their software estate. Your job is to interview the user about their infrastructure, CI/CD, cloud platform, and source code — then generate a working Deno/TypeScript CLI tool that discovers, correlates, and visualises every service, its dependencies, and how they connect.

This specification describes the architecture, data model, resolution rules, and connector patterns. Use it to guide your questions and generate the tool.

1. What You're Building

@davidfowl
davidfowl / ConcurrentDictionaryExtensions.cs
Last active January 8, 2026 18:00
using System;
using System.Threading.Tasks;
namespace System.Collections.Concurrent
{
public static class ConcurrentDictionaryExtensions
{
/// <summary>
/// Provides an alternative to <see cref="ConcurrentDictionary{TKey, TValue}.GetOrAdd(TKey, Func{TKey, TValue})"/> that disposes values that implement <see cref="IDisposable"/>.
/// </summary>
@fearthecowboy
fearthecowboy / Test.csproj
Last active February 13, 2025 07:40
The definitive way to use PowerShell from an msbuild script
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<!-- #1 Place this line at the top of any msbuild script (ie, csproj, etc) -->
<PropertyGroup><PowerShell># 2>nul || type %~df0|find /v "setlocal"|find /v "errorlevel"|powershell.exe -noninteractive -&amp; exit %errorlevel% || #</PowerShell></PropertyGroup>
<!-- #2 in any target you want to run a script -->
<Target Name="default" >
<PropertyGroup> <!-- #3 prefix your powershell script with the $(PowerShell) variable, then code as normal! -->
<myscript>$(PowerShell)
@NickCraver
NickCraver / DmpAnalysis.linq
Last active May 1, 2024 21:09
DMP Analysis in LinqPad
<Query Kind="Program">
<NuGetReference Prerelease="true">Microsoft.Diagnostics.Runtime</NuGetReference>
<Namespace>Microsoft.Diagnostics.Runtime</Namespace>
<Namespace>System</Namespace>
<Namespace>System.IO</Namespace>
<Namespace>System.Linq</Namespace>
<Namespace>System.Text</Namespace>
<Namespace>Microsoft.Diagnostics.Runtime.Utilities</Namespace>
</Query>
@NickCraver
NickCraver / Readme.md
Created April 10, 2016 19:40
A simple LINQPad script I wrote for load testing SQL Server.

This is a simple LINQPad script I wrote one day to load test some large SQL servers. Maybe it's useful to someone. The basic premise is defining your queries once, including which ID patterns to fetch (at the bottom), and load test a mixture. The script defines everything needed in one place, then fires up the command-line linqpad runner to run many queries at once.

Params up top:

const string LinqPadPath = @"C:\Linqpad\lprun.exe";
const bool runSequential = false;
const int defaultThreads = 1;
const int defaultIterations = 2000;
@davidfowl
davidfowl / dotnetlayout.md
Last active February 28, 2026 18:13
.NET project structure 
$/
  artifacts/
  build/
  docs/
  lib/
  packages/
  samples/
  src/
 tests/
@staltz
staltz / introrx.md
Last active March 10, 2026 03:48
The introduction to Reactive Programming you've been missing
@jpoehls
jpoehls / encoding-helpers.ps1
Created April 17, 2012 14:54
Convert-FileEncoding and Get-FileEncoding
<#
.SYNOPSIS
Converts files to the given encoding.
Matches the include pattern recursively under the given path.
.EXAMPLE
Convert-FileEncoding -Include *.js -Path scripts -Encoding UTF8
#>
function Convert-FileEncoding([string]$Include, [string]$Path, [string]$Encoding='UTF8') {
$count = 0