有人能说出这个观点有什么问题吗? [英] Can anybody tell whats wrong with the argument?

问题描述

这是代码，我试图摆脱代码文本中标记为粗体的红色花线. ." src ="https://social.msdn.microsoft.com/Forums/getfile/965377">

Here is the code and I am trying to get rid of the red squiggle line that is marked bold in the code text.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net.Sockets;
using System.Net;

namespace ChatMessenger
{
    public partial class Form1 : Form
    {
        Socket sck;
        EndPoint epLocal, epRemote;
        byte[] buffer;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //set up socket
            sck = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

            sck.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
            //get user IP
            IP_tbx.Text = GetLocalIP();
            remIP_tbx.Text = GetLocalIP();
        }

        private void connect_btn_Click(object sender, EventArgs e)
        {
            //binding socket connection
            epLocal = new IPEndPoint(IPAddress.Parse(IP_tbx.Text), Convert.ToInt32(localPort_tbx.Text));
            sck.Bind(epLocal);
            //connect to the user remote IP
            epLocal = new IPEndPoint(IPAddress.Parse(remIP_tbx.Text), Convert.ToInt32(remPort_tbx.Text));
            sck.Connect(epRemote);
            //Listenign the specific port
            buffer = new byte[1500];
            sck.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref epRemote, new AsyncCallback(MessageCallBack), buffer);
        }
        private void MessageCallBack(IAsyncResult aResult)
        {
            try
            {
                byte[] receivedData = new byte[1500];
                receivedData = (byte[])aResult.AsyncState;
                //Converts byte to string
                ASCIIEncoding aEncoding = new ASCIIEncoding();
                string receivedMessaage = aEncoding.GetString(receivedData);

                //Adding the bytes to the message box
                message_box.Items.Add("Friend: " + receivedMessaage);
                buffer = new byte[1500];
                sck.BeginReceive(buffer, 0,buffer.Length, SocketFlags.None, ref epRemote, new AsyncCallback(MessageCallBack), buffer);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }

        private void send_btn_Click(object sender, EventArgs e)
        {
            //Convert string to byte
            ASCIIEncoding aEncoding = new ASCIIEncoding();
            byte[] sendingMessage = new byte[1500];
            sendingMessage = aEncoding.GetBytes(message_box.Text);
            //Sending the encoded message
            sck.Send(sendingMessage);
            //add to the list
            message_box.Items.Add("me: " + ChatBox_tbx.Text);
        }

        private string GetLocalIP()
        {
            
            IPHostEntry host;
            host = Dns.GetHostEntry(Dns.GetHostName());
            foreach (IPAddress ip in host.AddressList)
            {
                if (ip.AddressFamily == AddressFamily.InterNetwork)
                    return ip.ToString();
            }
            return  "127.0.0.1";
        }
    }
}

推荐答案

sck.BeginReceive(buffer, 0,buffer.Length, SocketFlags.None, ref epRemote, new AsyncCallback(MessageCallBack), buffer);

您是否尝试过使用"out"按钮关键字?

... out ref epRemote ...

Have you tried it with the "out" keyword?

... out ref epRemote ...

或:

...退出epRemote ...

Or:

... out epRemote ...

-韦恩

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