NMZivkovic

namespace SingletonExamples
{
    /// <summary>
    /// Broken, non thread-save solution.
    /// Don't use this code.
    /// </summary>
    public class SingletonFirst
    {
        private static SingletonFirst _instance;

NMZivkovic

namespace SingletonExamples
{
    /// <summary>
    /// Simple Thread safe solution.
    /// </summary>
    public class SingletonThreadSafe
    {
        private static SingletonThreadSafe _instance;
        private static readonly object _lock = new object();

NMZivkovic

namespace SingletonExamples
{
    /// <summary>
    /// Using static constructor.
    /// </summary>
    public class SingletonStatic
    {
        private static SingletonStatic instance;

        private SingletonStatic() { }

NMZivkovic

using System;

namespace SingletonExamples
{
    /// <summary>
    /// Solution using Lazy implementation.
    /// </summary>
    public class SingletonLazy
    {
        private static readonly Lazy<SingletonLazy> instance =

NMZivkovic

string data = "Item1";

var action1 = new Action(() => { Console.Write("This is one!"); });
var action2 = new Action(() => { Console.Write("This is two!"); });
var action3 = new Action(() => { Console.Write("This is three!"); });

switch (data)
{
    case "Item1":
        action1();

NMZivkovic

public class Entity
{
    public string Type { get; set; }

    public int GetNewValueBasedOnType(int newValue)
    {
        int returnValue;
        switch (Type)
        {
            case "Type0":

NMZivkovic

var entity = new Entity() { Type = "Type1" };
var value = entity.GetNewValueBasedOnType(6);

NMZivkovic

public enum EntityType
{
    Type0 = 0,
    Type1 = 1,
    Type2 = 2
}

public abstract class Entity
{
    public abstract int GetNewValue(int newValue);

NMZivkovic

public class EntityFactory
{
    private Dictionary<EntityType, Func<entity>> _entityTypeMapper;

    public EntityFactory()
    {
        _entityTypeMapper = new Dictionary<entitytype, func<entity="">>();
        _entityTypeMapper.Add(EntityType.Type0, () => { return new Type0Entity(); });
        _entityTypeMapper.Add(EntityType.Type1, () => { return new Type1Entity(); });
        _entityTypeMapper.Add(EntityType.Type2, () => { return new Type2Entity(); });

NMZivkovic

public class Type0Entity : Entity
{
    public override int GetNewValue(int newValue)
    {
        return newValue;
    }
}

public class Type1Entity : Entity
{