C#线程安全类型

1、IProducerConsumerCollection (线程安全接口)
　　此接口的所有实现必须都启用此接口的所有成员，若要从多个线程同时使用。

using System;
using System.Collections;
using System.Collections.Concurrent;
using System.Collections.Generic;

namespace ConsoleApp1
{
    public class SafeStack<T> : IProducerConsumerCollection<T>
    {
        // Used for enforcing thread-safety
        private object m_lockObject = new object();

        // We'll use a regular old Stack for our core operations
        private Stack<T> m_sequentialStack = null;

        //
        // Constructors
        //
        public SafeStack()
        {
            m_sequentialStack = new Stack<T>();
        }

        public SafeStack(IEnumerable<T> collection)
        {
            m_sequentialStack = new Stack<T>(collection);
        }

        //
        // Safe Push/Pop support
        //
        public void Push(T item)
        {
            lock (m_lockObject) m_sequentialStack.Push(item);
        }

        public bool TryPop(out T item)
        {
            bool rval = true;
            lock (m_lockObject)
            {
                if (m_sequentialStack.Count == 0) { item = default(T); rval = false; }
                else item = m_sequentialStack.Pop();
            }
            return rval;
        }

        //
        // IProducerConsumerCollection(T) support
        //
        public bool TryTake(out T item)
        {
            return TryPop(out item);
        }

        public bool TryAdd(T item)
        {
            Push(item);
            return true; // Push doesn't fail
        }

        public T[] ToArray()
        {
            T[] rval = null;
            lock (m_lockObject) rval = m_sequentialStack.ToArray();
            return rval;
        }

        public void CopyTo(T[] array, int index)
        {
            lock (m_lockObject) m_sequentialStack.CopyTo(array, index);
        }



        //
        // Support for IEnumerable(T)
        //
        public IEnumerator<T> GetEnumerator()
        {
            // The performance here will be unfortunate for large stacks,
            // but thread-safety is effectively implemented.
            Stack<T> stackCopy = null;
            lock (m_lockObject) stackCopy = new Stack<T>(m_sequentialStack);
            return stackCopy.GetEnumerator();
        }


        //
        // Support for IEnumerable
        //
        IEnumerator IEnumerable.GetEnumerator()
        {
            return ((IEnumerable<T>)this).GetEnumerator();
        }

        // 
        // Support for ICollection
        //
        public bool IsSynchronized
        {
            get { return true; }
        }

        public object SyncRoot
        {
            get { return m_lockObject; }
        }

        public int Count
        {
            get { return m_sequentialStack.Count; }
        }

        public void CopyTo(Array array, int index)
        {
            lock (m_lockObject) ((ICollection)m_sequentialStack).CopyTo(array, index);
        }
    }
}

SafeStack