C＃返回ConcurrentBag的副本 [英] C# Return a Copy of ConcurrentBag

问题描述

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Collections.Concurrent;

namespace Crystal_Message
{
    class Message
    {
        private int messageID;
        private string message;
        private ConcurrentBag <Employee> messageFor;
        private Person messageFrom;
        private string calltype;

        public Message(int iden,string message, Person messageFrom, string calltype, string telephone)
        {
            this.messageID = iden;
            this.messageFor = new ConcurrentBag<Employee>();
            this.Note = message;
            this.MessageFrom = messageFrom;
            this.CallType = calltype;
        }

        public ConcurrentBag<Employee> ReturnMessageFor
        {
            get
            {

                return messageFor;
            }

        }

        public int MessageIdentification
        {
            get { return this.messageID; }

            private set
            {
                if(value == 0)
                {
                    throw new ArgumentNullException("Must have Message ID");
                }

                this.messageID = value;
            }

        }

        public string Note
        {
            get { return message; }

            private set
            {
                if (string.IsNullOrWhiteSpace(value))
                {
                    throw new ArgumentException("Must Have a Message");

                }
                this.message = value;


            }

        }

        public Person MessageFrom
        {
            get { return messageFrom; }

            private set
            {
                this.messageFrom = value;
            }

        }

        public string CallType
        {
            get { return this.calltype; }

            private set
            {
                if (string.IsNullOrWhiteSpace(value))
                {
                    throw new ArgumentNullException("Please specify call type");
                }

                this.calltype = value;

            }

        }

        public void addEmployee(Employee add)
        {
            messageFor.Add(add);
        }


        public override string ToString()
        {
            return "Message: " + this.message + " From: " + this.messageFrom + " Call Type: " + this.calltype + " For: " + this.returnMessagefor();
        }

        private string returnMessagefor() 
        {
            string generate="";

            foreach(Employee view in messageFor)
            {
                generate += view.ToString() + " ";
            }

            return generate;
        }

        public override bool Equals(object obj)
        {
            if (obj == null)
            {
                return false;
            }

            Message testEquals = obj as Message;

            if((System.Object)testEquals == null)
            {
                return false;
            }

            return (this.messageID == testEquals.messageID) && (this.message == testEquals.message) && (this.messageFor == testEquals.messageFor) && (this.messageFrom == testEquals.messageFrom) && (this.calltype == testEquals.calltype);

        }

        public bool Equals(Message p)
        {
            if ((Object)p == null)
            {
                return false;
            }

            return (this.messageID == p.messageID) && (this.message == p.message) && (this.messageFor == p.messageFor) && (this.messageFrom == p.messageFrom) && (this.calltype == p.calltype);

        }

        public override int GetHashCode()
        {


            unchecked
            {
                return this.messageID.GetHashCode() * 33 ^ this.message.GetHashCode() * 33 ^ this.messageFor.GetHashCode() * 33 ^ this.messageFrom.GetHashCode() * 33 ^ this.calltype.GetHashCode();
            }


        }

    }
}

我有一个Message类，其中用户可以留言给多个人。我有这方面的吸气剂，但是，返回一个ConcurrentBag<>我做了正确的做法的方式吗？如果不是，我怎么返回ConcurrentBag<？>这样我就可以通过它循环，并显示它

I have a Message class where a user could leave a message for more than one person. I have a getter for it, however, is returning a ConcurrentBag<> the way I've done proper practice? If not, how do i return the ConcurrentBag<> so I can loop through it and display it?

推荐答案

ConcurrentBag< T> 是的IEnumerable< T> 。你可以通过它循环如常。然而，由于这是一个线程安全的集合，也有性能问题来使用它。

ConcurrentBag<T> is an IEnumerable<T>. You can loop through it as usual. However, as this is a thread safe collection, there are performance concerns to using it.

如果你想摆脱对性能的影响，而循环，调用的ToArray 上并返回新数组。而不是

If you want to get rid of the performance impact while looping, call ToArray on it and return the new array instead.

    public IEnumerable<Employee> ReturnMessageFor
    {
        get
        {

            return messageFor.ToArray();
        }

    }

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