Python language basics 59: catching multiple exception types

October 31, 2015 2 Comments

Introduction

In the previous post we looked at how to handle exceptions in python. The most important keywords you’ll need to know of are “try” and “except”. We saw how code execution stops at the point where the exception is raised. It continues on the first line of a matching except-block, i.e. which handles just that type of exception that was raised.

This short post shows a little trick if you want to handle different types of exception in the same way.

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Calculate the number of months between two dates with C#

October 30, 2015 2 Comments

Say you’d like to calculate the difference between two dates in terms of number of months.

The following simple function will do just that: return the absolute number of months between two dates:

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Domain Driven Design with Web API extensions part 3: starting with domain events

October 29, 2015 1 Comment

Introduction

In the previous post we looked at how to apply the decorator pattern for our emailing scenario in the domain driven design demo project. We saw how the pattern helped us augment the functionality of the original TimetableService in an object oriented fashion. We also managed to wire up the decorator in StructureMap.

In this post we’ll solve the same problem in a different way. Well, at least we’ll start looking at another solution. Also, we’ll start discussing another concept from DDD: domain events. This part of the topic will be divided into two posts: the current post lays the theoretical foundations for the concepts and the next post will show the code.

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Various quarter-related DateTime functions in C#

October 28, 2015 2 Comments

The DateTime object – or struct – lacks functions for quarters. You can e.g. add minutes, months, days etc. to a date but not quarters.

Here comes a short list of simple quarter-related functions.

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How to change the size of the command prompt in a .NET console application

October 27, 2015 1 Comment

Occasionally you might need to change the size of the console window in a .NET console application. There are methods and properties available in the Console object that enable you to perform this operation easily.

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Domain Driven Design with Web API extensions part 2: notifications with the decorator pattern

October 26, 2015 Leave a comment

Introduction

In the previous post we started building an extension to our DDD skeleton project. We saw a simple way of adding a component to the TimetableService so that we could send an email upon inserting or updating a load test. We also discussed the pros and cons of the current implementation.

In this post we’ll see an alternative solution using the Decorator design pattern.

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Python language basics 58: exception handling in code

October 24, 2015 2 Comments

Introduction

In the previous post we started discussing exceptions and errors. We looked at a couple of important terms, such as throwing, catching and handling exceptions. Good exception handling will make your application more stable. Your users may still be irritated by exception messages but it’s nothing compared to how they feel when an application simply crashes, closes by itself or even freezes the device it’s running on so that it needs rebooting.

In this post we’ll look at how to handle exceptions in code.

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Encrypt and decrypt plain string with triple DES in C#

October 23, 2015 5 Comments

We looked at encryption mechanisms in details on this blog – refer to the link at the end of this post. This is only a quick extension showing how to encrypt a plain string using Triple DES.

Consider the following method which encrypts a plain string with a key a cipher mode ECB:

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Domain Driven Design with Web API extensions part 1: notifications

October 22, 2015 3 Comments

Introduction

A couple of weeks ago we went through an updated series on Domain Driven Design starting with this post. We built a functioning skeleton project with EntityFramework as the backing store, a Web API layer as the top consumer, a loosely coupled service layer and a central domain layer with some logic.

In this extension series we’ll investigate a couple of ways to add various dependencies to the project. In particular we’ll look into how to send email notifications in case a new load test has been booked.

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Collect day and month names of a culture in C#

October 21, 2015 1 Comment

The CultureInfo class helps you get the names of days and months in various languages that belong to the selected culture.

Here come 2 simple functions to collect the day and month names in string lists:

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