Tips and tricks in C# .NET
December 24, 2015 Leave a comment
Introduction
In the previous post we looked at a couple of basic operations with the MongoDb .NET driver. I decided to include that “intermediate” post so that you won’t get overwhelmed with a lot of new code if you’re new to MongoDb.
In this post we’ll to be implement the ITimetableRepository interface in the MongoDb repository layer.
December 23, 2015 Leave a comment
A Process object in the System.Diagnostics namespace refers to an operating-system process. This object is the entry point into enumerating the processes currently running on the OS.
This is how you can find the currently active process:
Process current = Process.GetCurrentProcess(); Console.WriteLine(current);
…which will yield the name of the process running this short test code.
It’s probably very rare that you’ll use the above method for anything as it’s not too useful.
December 22, 2015 Leave a comment
It’s a common scenario that you need to write some content to a file. Here you see 5 ways to achieve that.
1. Using a FileStream:
private void WriteToAFileWithFileStream()
{
using (FileStream target = File.Create(@"c:\mydirectory\target.txt"))
{
using (StreamWriter writer = new StreamWriter(target))
{
writer.WriteLine("Hello world");
}
}
}
December 21, 2015 1 Comment
Introduction
In the previous post we successfully seeded our MongoDb load testing data store. We saw that the Seed() method wasn’t all that different from its EntityFramework equivalent.
In this post we’ll look at a range of examples of using the MongoDb driver. We’ll primarily consider CRUD operations. Originally I wanted to simply present the implementation of the domain repository interfaces. However, I thought it may be too overwhelming for MongoDb novices to be presented all the new object types and query functions. The purpose of this “intermediate” post is therefore to provide a soft start in MongoDb queries.
We’ll be working in the MongoDbDatabaseTester project of the DDD demo solution in this post. Make sure you start up the MongoDb server with the “mongod” command in a command prompt.
December 20, 2015 2 Comments
Introduction
In the previous post we discussed class level properties in some detail. The most important detail we learned is that there are only public members in a Python class. Properties can be added to “self” on the fly within the class but those properties will be visible to all external callers. So all you’ve learnt about access modifiers from your Java course, such as private or public is not applicable in Python.
In this post we’ll explore the basics of validating the values that are sent into the object initialiser. Validation is a large topic so consider this only as a light introduction.
December 19, 2015 Leave a comment
Introduction
In the previous post we looked at initializers and class level properties. We saw how to add the init method to a class so that we could provide the name property. We also added a second init method so that we could still have an “empty” Person object with no preset name. We also discussed how to attach class level fields to “self” on the fly. The value assigned to those properties was available from another class level method.
In this post we’ll consider class level properties. I felt it was important to provide a post dedicated to that topic because the behaviour of class properties in Python is markedly different from other popular OOP languages such as Java, C#, C++ or VB.NET. At least I was quite surprised when I was first exposed to these class related details in Python.
December 18, 2015 Leave a comment
It’s easy to override the mathemtical operators like + or – in C# to build custom operations.
Consider the following simple Rectangle class:
public class Rectangle
{
public Rectangle(int width, int height)
{
Height = height;
Width = width;
}
public int Width
{
get;
set;
}
public int Height
{
get;
set;
}
}
December 17, 2015 1 Comment
Introduction
In the previous post we constructed the database objects that represent the database version of the load testing domain objects. Recall that there’s no automated code generation and mapping tool for MongoDb .NET – at least not yet. Therefore decoupling database and domain objects with MongoDb as the backing store usually means some extra coding but in turn you’ll have completely independent database and domain objects.
We also inserted an abstraction and a concrete implementation for the connection string repository.
In this post we’ll seed the database with the same initial values as we had for the EF data store.
December 16, 2015 1 Comment
As you know primitive numeric types in C# – and other modern programming languages – have maximum and minimum values that can be stored in memory. If you’re trying to store a larger number in the variable then you’ll get an overflow with unexpected results.
Let’s see an example with the “byte” type. It is actually not one of the primitive types, like int or long, but simply a keyword for an integral type to store the numbers 0-255. Why 255? 1 byte consists of 8 bits and 8 bits in the computer’s memory allows us to store 255 as the highest number. 255 in binary is all 1’s for all 8 bits:
11111111
What happens if we add 1 to that? On paper we can easily solve it by some basic binary maths:
11111111
+ 00000001
===========
100000000
December 15, 2015 1 Comment
Custom implicit and explicit conversions for numeric types can be defined in C# quite easily. You need to be aware of the “implicit”, “explicit” and “operator” keywords.
Consider the following class:
public class Measurement
{
public int Value { get; set; }
}
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