C# – Page 3 – Frank DeCaire

DBContextOptionsBuilder does not contain a definition for ‘UseSqlServer’

February 13, 2019April 2, 2017 by Frank DeCaire

Attempting to use the correct NuGet packages for your code in .Net Core can be challenging. In this instance there is no project.json error and yet this one property is missing: This will happen when your EF database project contains at least these two NuGet packages: “dependencies”: { “Microsoft.EntityFrameworkCore”: “1.1.1”, “NETStandard.Library”: “1.6.1” … Read moreDBContextOptionsBuilder does not contain a definition for ‘UseSqlServer’

Dot Net Core Using the IOC Container

February 13, 2019April 2, 2017 by Frank DeCaire

I’ve talked about Inversion Of Control in previous posts, but I’m going to go over it again. If you’re new to IOC containers, breaking dependencies and unit testing, then this is the blog post you’ll want to read. So let’s get started… Basic Concept of Unit Testing Developing and maintaining software is one of the … Read moreDot Net Core Using the IOC Container

Dot Net Core In Memory Unit Testing Using xUnit

May 23, 2020April 2, 2017 by Frank DeCaire

When I started using .Net Core and xUnit I found it difficult to find information on how to mock or fake the Entity Framework database code. So I’m going to show a minimized code sample using xUnit, Entity Framework, In Memory Database with .Net Core. I’m only going to setup two projects: DataSource and UnitTests. … Read moreDot Net Core In Memory Unit Testing Using xUnit

Building an ALU from an EPROM

December 24, 2022February 5, 2017 by Frank DeCaire

This blog post is a “what-if” scenario, rather than a practical application. Still, if EPROMs ever become super fast, this is a viable option. I’ve discussed Arithmetic Logic Units in previous posts. I have the circuit for the TTL 74381 and 74382 chips. The circuit is easy to find on the internet and it’s included … Read moreBuilding an ALU from an EPROM

Digital Logic Simulator Progress

February 14, 2019January 7, 2017 by Frank DeCaire

Summary In this post I’m going to talk more about creating simulation software and the difficulties of inventing something new. Writing Software is Like Working in a Sausage Factory Writing new software is more of an art than a science. Sure, we call ourselves scientists and we have methods and proven algorithms for getting things … Read moreDigital Logic Simulator Progress

Simulating TTL Circuits

December 24, 2022December 23, 2016 by Frank DeCaire

Summary I’m going to continue with my logic simulator project in this post. This project has turned into a serious obsession, ahem, hobby. My final goal is to be able to simulate a full computer circuit. TTL Logic As I’ve mentioned in my previous posts, there is a wiki page for TTL logic that lists … Read moreSimulating TTL Circuits

JK Master/Slave Flip Flop

February 14, 2019December 10, 2016 by Frank DeCaire

Introduction I’m sure readers are becoming bored with Flip Flops by now, but bear with me. The previous JK flip flop was a simple 4-NAND gate device, this circuit is the standard two flip flop device that is more stable when used in toggle mode. The Circuit The Master/Slave flip flop circuit is a bit … Read moreJK Master/Slave Flip Flop

JK Flip Flop Simulator

February 14, 2019December 3, 2016 by Frank DeCaire

Introduction I’ve been working on a simulation of the JK flip flop for quite some time now. I had to tweak my algorithms a bit to overcome problems with an unstable condition that I’ll discuss in this blog post. Handling Unknown Inputs One of the problems with circuits that contain feed back connections is that … Read moreJK Flip Flop Simulator

Falstad Circuit Simulator and the SR Latch

February 14, 2019November 14, 2016 by Frank DeCaire

Summary In my last post I described a logic circuit simulator that I was working on. I have continued to work on this simulator source code and have discovered a difficulty in simulating a flip-flop. While researching for a creative solution to my dilemma I stumbled across a circuit called a Falstad circuit. This … Read moreFalstad Circuit Simulator and the SR Latch

Digital Logic Simulator

December 24, 2022November 12, 2016 by Frank DeCaire

Summary One of my favorite college courses was a computer simulation. This was a 400-level course that required calculus-based statistics. Our projects included a project to simulate real-world queuing problems like a Mcdonald’s drive-through line and an airport with one runway. The answers that we were required to ask were things like: How many cars … Read moreDigital Logic Simulator