Enabling C# 7.1 and 7.2 features in your .NET code

C# 7.0 has been quickly enhanced with a couple of new features in 7.1 and 7.2. If you start Visual Studio 2017 and try e.g. the new “private protected” access modifier then the compiler may not accept it:

public abstract class Animal
{
	private String privateName = "Private name";
	protected String protectedName = "Protected name";
	protected internal String protectedInternalName = "Protected internal name"; 
	private protected String privateProtectedName = "Private protected name";
	public String publicName = "Public name";
}

If it puts a red line under “private protected” saying that this access modifier combination is not allowed then you’ll know that C# 7.2 has not been enabled yet.

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Throwing exceptions in expressions in C# 7.0

C# 7.0 makes it possible to throw exceptions with ternary and null-coalescing operators.

Here’s an example where we throw an exception if the divisor is 0:

private double Divide(double what, double withWhat)
{
	return withWhat != 0 ? what / withWhat : throw new ArgumentException("nono");
}

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Efficient linked lists in .NET

Sometimes you need a collection that’s modified a lot: you insert, update and remove items. A List of T is then inefficient as it needs to constantly rearrange all other items. The LinkedList class might be a better candidate.

A linked list is a doubly-linked list. Each item has a Next and Previous pointer to look at which element comes right before and after a particular object in the list. A linked list is very efficient at inserting and deleting items in particular.

Initialisation:

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Performing some action while waiting for a key to be pressed in .NET console applications

You can wait for the user to press some button in a .NET console application using the Console.ReadKey() method. That’s simple and easy to use, but occasionally you might want to perform some action while waiting for the user to press a key.

The KeyAvailable property of the Console object helps you achieve just that.

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How to hide the text entered in a .NET console application

You’ve probably encountered console applications that ask for a password. It’s very likely that the password will stay hidden otherwise other people viewing your screen can easily read it.

This short post will present a possible solution on how to achieve a hidden string input in a .NET console application.

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Implementing an enumerator for a custom object in .NET C#

You can create an enumerator for a custom type by implementing the generic IEnumerable of T interface. Normally you’d do that if you want to create a custom collection that others will be able to iterate over using foreach. However, there’s nothing stopping you from adding an enumerator to any custom type if you feel like it, it’s really simple.

Consider the following Guest class:

public class Guest
{
	public string Name { get; set; }
	public int Age { get; set; }
}

Guests can be invited to a Party:

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Keeping the key-values sorted by using a SortedDictionary with C# .NET

You can use the generic SortedDictionary of Key and Value to automatically keep the key value items sorted by their keys. Any time you add a new key value pair the dictionary will reorder the items. The SortedDictionary was optimised for frequent changes to its list of items. Keep in mind that the items will be sorted by their key and not their value.

Consider the following simple custom object:

public class Student
{
	public string Name { get; set; }
	public string SchoolName { get; set; }
}

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