Join custom objects into a concatenated string in .NET C#

Say you have the following Customer object with an overridden ToString method:

public class Customer
{
	public int Id { get; set; }
	public string Name { get; set; }
	public string City { get; set; }

	public override string ToString()
	{
		return string.Format("Id: {0}, name: {1}, city: {2}", Id, Name, City);
	}
}

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How to create custom string formatters with C# .NET

.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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Using NumberStyles to parse numbers in C# .NET

There are a lot of number formats out there depending on the industry we’re looking at. E.g. negative numbers can be represented in several different ways:

  • -14
  • (14)
  • 14-
  • 14.00-
  • (14,00)

…and so on. Accounting, finance and other, highly “numeric” fields will have their own standards to represent numbers. Your application may need to parse all these strings and convert them into proper numeric values. The static Parse method of the numeric classes, like int, double, decimal all accept a NumberStyles enumeration. This enumeration is located in the System.Globalization namespace.

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5 ways to compress/uncompress files in .NET

There are numerous compression algorithm out there for file compression. Here come 5 examples with how-to-do links from this blog.

Compressing individual files

The following algorithms can be used to compress a single file. E.g. source.txt will be compressed to source.txt.gz.

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Calculate standard deviation of integers with C# .NET

Here comes a simple extension method to calculate the standard deviation of a list of integers:

public static double GetStandardDeviation(this IEnumerable<int> values)
{
	double standardDeviation = 0;
	int[] enumerable = values as int[] ?? values.ToArray();
	int count = enumerable.Count();
	if (count > 1)
	{
		double avg = enumerable.Average();
		double sum = enumerable.Sum(d => (d - avg) * (d - avg));
		standardDeviation = Math.Sqrt(sum / count);
	}
	return standardDeviation;
}

Here’s how you can call this method:

List<int> ints = new List<int>() { 4, 7, 3, 9, 13, 90, 5, 25, 13, 65, 34, 76, 54, 12, 51, 23, 3, 1, 7 };
double stdev = ints.GetStandardDeviation();

View all various C# language feature related posts here.

How to build URIs with the UriBuilder class in C#

You can normally use the URI object to construct URIs in C#. However, there’s an object called UriBuilder which lets you build up a URI from various elements.

Here’s an example to construct a simple HTTP address with a scheme, a host and a path:

UriBuilder uriBuilder = new UriBuilder();
uriBuilder.Scheme = "http";
uriBuilder.Host = "cnn.com";
uriBuilder.Path = "americas";
Uri uri = uriBuilder.Uri;

uri will be “http://cnn.com/americas&#8221;.

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Combinable enumerations in C# .NET

You’ve probably encountered cases with combined enum values using the pipe character, i.e. the “bitwise or” operator ‘|’:

Size.Large | Size.ExtraLarge

Let’s see an example of how to create such an enum.

The enumeration is decorated with the Flags attribute like in the following example:

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