Shared/Kernelx/Kernelx/Data/Lazy.cs

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#if NET35

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Kernelx.Data
{
    /// <summary>
    /// 
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public class Lazy<T>
    {
        private T _value;

        private readonly Func<T> _valueFactory;

        /// <summary>
        /// 
        /// </summary>
        /// <param name="valueFactory"></param>
        public Lazy(Func<T> valueFactory)
        {
            _valueFactory = valueFactory;
            IsValueCreated = false;
        }

        /// <summary>
        /// 
        /// </summary>
        public bool IsValueCreated { get; private set; }


        /// <summary>
        /// 
        /// </summary>
        public T Value { get 
            {
                if (!IsValueCreated)
                {
                    lock (this)
                        if (!IsValueCreated) 
                        {
                            _value = _valueFactory();
                            IsValueCreated=true;
                        }
                }
                return _value;
            } 
        }

        /// <summary>
        /// 
        /// </summary>
        /// <returns></returns>
        public override string ToString()
        {
            return Value?.ToString();