Tutorial by Examples: me

Dapper makes it easy to follow best practice by way of fully parameterized SQL. Parameters are important, so dapper makes it easy to get it right. You just express your parameters in the normal way for your RDBMS (usually @foo, ?foo or :foo) and give dapper an object that has a member called foo...

Extension methods were introduced in C# 3.0. Extension methods extend and add behavior to existing types without creating a new derived type, recompiling, or otherwise modifying the original type. They are especially helpful when you cannot modify the source of a type you are looking to enhance. Ex...

Extension methods can also be used like ordinary static class methods. This way of calling an extension method is more verbose, but is necessary in some cases. static class StringExtensions { public static string Shorten(this string text, int length) { return text.Substring(0, ...

The nameof operator returns the name of a code element as a string. This is useful when throwing exceptions related to method arguments and also when implementing INotifyPropertyChanged. public string SayHello(string greeted) { if (greeted == null) throw new ArgumentNullException(nam...

Expression-bodied function members allow the use of lambda expressions as member bodies. For simple members, it can result in cleaner and more readable code. Expression-bodied functions can be used for properties, indexers, methods, and operators. Properties public decimal TotalPrice => Base...

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) { ... } ...

Declaration: void MyGenericMethod<T1, T2, T3>(T1 a, T2 b, T3 c) { // Do something with the type parameters. } Invocation: There is no need to supply type arguements to a genric method, because the compiler can implicitly infer the type. int x =10; int y =20; string z = "tes...

Declaration: interface IMyGenericInterface<T1, T2, T3, ...> { ... } Usage (in inheritance): class ClassA<T1, T2, T3> : IMyGenericInterface<T1, T2, T3> { ... } class ClassB<T1, T2> : IMyGenericInterface<T1, T2, int> { ... } class ClassC<T1> : IMyGenericI...

using System; using System.Reflection; using System.Linq; public class Program { public static void Main() { var members = typeof(object) .GetMembers(BindingFlags.Public | BindingFlags.Static | ...

Get Instance method and invoke it using System; public class Program { public static void Main() { var theString = "hello"; var method = theString .GetType() .GetMethod("Substring", ...

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...

<Foo> <Dog/> </Foo> public class Foo { // Using XmlElement [XmlElement(Name="Dog")] public Animal Cat { get; set; } }

<Store> <Articles> <Product/> <Product/> </Articles> </Store> public class Store { [XmlArray("Articles")] public List<Product> Products {get; set; } }

public class Dog { private const string _birthStringFormat = "yyyy-MM-dd"; [XmlIgnore] public DateTime Birth {get; set;} [XmlElement(ElementName="Birth")] public string BirthString { get { return Birth.ToString(_birthStringFormat); } ...

var names = new[] {"Foo","Bar","Fizz","Buzz"}; var thirdName = names.ElementAt(2); Console.WriteLine(thirdName); //Fizz //The following throws ArgumentOutOfRangeException var minusOnethName = names.ElementAt(-1); var fifthName = names.ElementAt(4); ...

var names = new[] {"Foo","Bar","Fizz","Buzz"}; var thirdName = names.ElementAtOrDefault(2); Console.WriteLine(thirdName); //Fizz var minusOnethName = names.ElementAtOrDefault(-1); Console.WriteLine(minusOnethName); //null var fifthName = names.Eleme...

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 { ...

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...