The finally { ... } block of a try-finally or try-catch-finally will always execute, regardless of whether an exception occurred or not (except when a StackOverflowException has been thrown or call has been made to Environment.FailFast()).
It can be utilized to free or clean up resources acquired i...
var persons = new[]
{
new {Id = 1, Name = "Foo"},
new {Id = 2, Name = "Bar"},
new {Id = 3, Name = "Fizz"},
new {Id = 4, Name = "Buzz"}
};
var names = persons.Select(p => p.Name);
Console.WriteLine(string.Join(",", names....
var persons = new[]
{
new {Id = 1, Name = "Foo"},
new {Id = 2, Name = "Bar"},
new {Id = 3, Name = "Fizz"},
new {Id = 4, Name = "Buzz"}
};
var personsSortedByNameDescending = persons.OrderByDescending(p => p.Name);
Console.WriteL...
var numbers1to5 = new[] {1, 2, 3, 4, 5};
var numbers4to8 = new[] {4, 5, 6, 7, 8};
var numbers1to8 = numbers1to5.Concat(numbers4to8);
Console.WriteLine(string.Join(",", numbers1to8));
//1,2,3,4,5,4,5,6,7,8
Note that duplicates are kept in the result. If this is undesirable, use...
Enumerable.Select returns an output element for every input element.
Whereas Enumerable.SelectMany produces a variable number of output elements for each input element. This means that the output sequence may contain more or fewer elements than were in the input sequence.
Lambda expressions passe...
var numbers = new[] {1,2,3,4,5};
var sameNumbers = new[] {1,2,3,4,5};
var sameNumbersInDifferentOrder = new[] {5,1,4,2,3};
var equalIfSameOrder = numbers.SequenceEqual(sameNumbers);
Console.WriteLine(equalIfSameOrder); //True
var equalIfDifferentOrder = numbers.SequenceEqual(sameNumbersInDi...
Returns a new dictionary from the source IEnumerable using the provided keySelector function to determine keys. Will throw an ArgumentException if keySelector is not injective(returns a unique value for each member of the source collection.) There are overloads which allow one to specify the value t...
const is used to represent values that will never change throughout the lifetime of the program. Its value is constant from compile-time, as opposed to the readonly keyword, whose value is constant from run-time.
For example, since the speed of light will never change, we can store it in a constan...
The namespace keyword is an organization construct that helps us understand how a codebase is arranged. Namespaces in C# are virtual spaces rather than being in a physical folder.
namespace StackOverflow
{
namespace Documentation
{
namespace CSharp.Keywords
{
...
Cast is different from the other methods of Enumerable in that it is an extension method for IEnumerable, not for IEnumerable<T>. Thus it can be used to convert instances of the former into instances of the later.
This does not compile since ArrayList does not implement IEnumerable<T>:
...
public interface IAnimal
{
string Name { get; set; }
}
public interface INoiseMaker
{
string MakeNoise();
}
public class Cat : IAnimal, INoiseMaker
{
public Cat()
{
Name = "Cat";
}
public string Name { get; set; }
public string M...
public class LivingBeing
{
string Name { get; set; }
}
public interface IAnimal
{
bool HasHair { get; set; }
}
public interface INoiseMaker
{
string MakeNoise();
}
//Note that in C#, the base class name must come before the interface names
public class Cat : LivingBei...
try, catch, finally, and throw allow you to handle exceptions in your code.
var processor = new InputProcessor();
// The code within the try block will be executed. If an exception occurs during execution of
// this code, execution will pass to the catch block corresponding to the exception typ...
using System;
using BasicStuff = System;
using Sayer = System.Console;
using static System.Console; //From C# 6
class Program
{
public static void Main()
{
System.Console.WriteLine("Ignoring usings and specifying full type name");
Console.WriteLine("...
