Tutorial by Examples: l

Double Quotes inside verbatim strings can be escaped by using 2 sequential double quotes "" to represent one double quote " in the resulting string. var str = @"""I don't think so,"" he said."; Console.WriteLine(str); Output: "I don't think s...

Verbatim strings can be combined with the new String interpolation features found in C#6. Console.WriteLine($@"Testing \n 1 2 {5 - 2} New line"); Output: Testing \n 1 2 3 New line Live Demo on .NET Fiddle As expected from a verbatim string, the backslashes are ignored as escap...

Exception filters give developers the ability to add a condition (in the form of a boolean expression) to a catch block, allowing the catch to execute only if the condition evaluates to true. Exception filters allow the propagation of debug information in the original exception, where as using an...

Introduction Properties can be initialized with the = operator after the closing }. The Coordinate class below shows the available options for initializing a property: 6.0 public class Coordinate { public int X { get; set; } = 34; // get or set auto-property with initializer public ...

Index initializers make it possible to create and initialize objects with indexes at the same time. This makes initializing Dictionaries very easy: var dict = new Dictionary<string, int>() { ["foo"] = 34, ["bar"] = 42 }; Any object that has an indexed gette...

String interpolation allows the developer to combine variables and text to form a string. Basic Example Two int variables are created: foo and bar. int foo = 34; int bar = 42; string resultString = $"The foo is {foo}, and the bar is {bar}."; Console.WriteLine(resultString); ...

It is possible to use await expression to apply await operator to Tasks or Task(Of TResult) in the catch and finally blocks in C#6. It was not possible to use the await expression in the catch and finally blocks in earlier versions due to compiler limitations. C#6 makes awaiting async tasks a lot e...

The ?. operator and ?[...] operator are called the null-conditional operator. It is also sometimes referred to by other names such as the safe navigation operator. This is useful, because if the . (member accessor) operator is applied to an expression that evaluates to null, the program will throw ...

Starting with C# 6, collections with indexers can be initialized by specifying the index to assign in square brackets, followed by an equals sign, followed by the value to assign. Dictionary Initialization An example of this syntax using a Dictionary: var dict = new Dictionary<string, int> ...

When a type is defined without a constructor: public class Animal { } then the compiler generates a default constructor equivalent to the following: public class Animal { public Animal() {} } The definition of any constructor for the type will suppress the default constructor genera...

public class Animal { public string Name { get; set; } public Animal() : this("Dog") { } public Animal(string name) { Name = name; } } var dog = new Animal(); // dog.Name will be set to "Dog" by default. var cat = new Ani...

The stackalloc keyword creates a region of memory on the stack and returns a pointer to the start of that memory. Stack allocated memory is automatically removed when the scope it was created in is exited. //Allocate 1024 bytes. This returns a pointer to the first byte. byte* ptr = stackalloc byte...

Adding the volatile keyword to a field indicates to the compiler that the field's value may be changed by multiple separate threads. The primary purpose of the volatile keyword is to prevent compiler optimizations that assume only single-threaded access. Using volatile ensures that the value of the ...

Declaration: class MyGenericClass<T1, T2, T3, ...> { // Do something with the type parameters. } Initialisation: var x = new MyGenericClass<int, char, bool>(); Usage (as the type of a parameter): void AnotherMethod(MyGenericClass<float, byte, char> arg) { ... } ...

A constructor of a base class is called before a constructor of a derived class is executed. For example, if Mammal extends Animal, then the code contained in the constructor of Animal is called first when creating an instance of a Mammal. If a derived class doesn't explicitly specify which constru...

When an object graph is finalized, the order is the reverse of the construction. E.g. the super-type is finalized before the base-type as the following code demonstrates: class TheBaseClass { ~TheBaseClass() { Console.WriteLine("Base class finalized!"); } } ...

To avoid duplicating code, define common methods and attributes in a general class as a base: public class Animal { public string Name { get; set; } // Methods and attributes common to all animals public void Eat(Object dinner) { // ... } public void Stare()...

An interface is used to enforce the presence of a method in any class that 'implements' it. The interface is defined with the keyword interface and a class can 'implement' it by adding : InterfaceName after the class name. A class can implement multiple interfaces by separating each interface with ...

public class Animal { public string Name { get; set; } } public interface INoiseMaker { string MakeNoise(); } //Note that in C#, the base class name must come before the interface names public class Cat : Animal, INoiseMaker { public Cat() { Name = "Ca...

public void SerializeFoo(string fileName, Foo foo) { var serializer = new XmlSerializer(typeof(Foo)); using (var stream = File.Open(fileName, FileMode.Create)) { serializer.Serialize(stream, foo); } }