How to create custom string formatters with C# .NET

December 4, 2015 Leave a comment

.NET has a fairly large number of built-in string formatters that you can pass into the string.Format method. Here are some examples from the MSDN page about formatting:

String.Format("{0,-12}{1,8:yyyy}{2,12:N0}{3,8:yyyy}{4,12:N0}{5,14:P1}",
                                city.Item1, city.Item2, city.Item3, city.Item4, city.Item5,
                                (city.Item5 - city.Item3)/ (double)city.Item3);
String.Format("{0,-12}{1,8}{2,12}{1,8}{2,12}{3,14}\n",
                                    "City", "Year", "Population", "Change (%)");
String.Format("{0,-10:C}", 126347.89m);

The IFormatProvider and ICustomFormatter interfaces will provide you with the methods required to create your own formats.

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Domain Driven Design with Web API extensions part 8: domain repository with MongoDb

December 3, 2015 1 Comment

Introduction

Some months 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 how to implement the domain repository in a data store that’s markedly different from SQL Server. In particular we’ll take a look at the NoSql document-based MongoDb.

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Type conversion example in C# .NET using the IConvertible interface

December 2, 2015 1 Comment

In this we saw how to convert between numeric types explicitly and implicitly. There are other ways to implement conversions in C#. You must have come across the System.Convert static methods such as System.ConvertToInt32 or System.ConvertToByte.

You can implement your own conversions by implementing the IConvertible interface. Consider the following object:

public class House
{
	public double Area { get; set; }
	public int NumberOfRooms { get; set; }
	public string Address { get; set; }
	public bool ForSale { get; set; }
        public DateTime DateBuilt { get; set; }
}

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Keyword function arguments in C#

December 1, 2015 Leave a comment

In this post we’ll quickly go through positional vs. keyword function arguments in C#.

Say you have the following function:

public string GetContent(bool base64encode, bool compress, bool withUniqueId, string filename, int maxSize)
{
	return string.Empty;
}

You’ll learn very early in your programming class that you can call a function by supplying the arguments in exactly the same order as they are listed in the method signature. Here’s an example:

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