客户端同步方式和异步方式

using System;
using System.Net.Sockets;
using System.Text;
using UnityEngine;
using UnityEngine.UI;

public class EchoClient : MonoBehaviour
{
    public const int port = 8888;
    Socket socket;
    public InputField inputField;
    public Text textShow;
    StringBuilder stringBuilder=new StringBuilder();
    public Button sendButton;
    public Button connetButton;
    byte[] receiveBuffer = new byte[1024];
    string receiveString = "";



    #region 异步模式

    
    /// 

    /// 异步连接
    /// 
    public void AsyncConnection()
    {
        socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
        socket.BeginConnect("192.168.0.105", port, ConnectionCallBack,socket);
    }
    /// 

    /// 异步连接回调
    /// 
    /// 
    private void ConnectionCallBack(IAsyncResult ar)
    {
        try
        {
            Socket socket = ar.AsyncState as Socket;
            socket.EndConnect(ar);
            Debug.Log("成功连接服务器");
            stringBuilder.Append("\n"+"成功连接服务器");
            //连接成功后，就开始异步接收
            socket.BeginReceive(receiveBuffer,0,1024,0,ReceiveCallBack,socket);
        }
        catch (Exception ex)
        {
            stringBuilder.Append("\n" + "连接失败+" + ex.Message);
            Debug.Log("连接失败+"+ex.Message);
        }
    }
    /// 

    /// 异步接收回调
    /// 
    /// 
    private void ReceiveCallBack(IAsyncResult ar)
    {
        try
        {
            Socket socket = ar.AsyncState as Socket;
            int length = socket.EndReceive(ar);
            receiveString = Encoding.Default.GetString(receiveBuffer, 0, length);
            stringBuilder.Append("\n"  + receiveString);
            //接收完消息后，再次开启异步接收
            socket.BeginReceive(receiveBuffer,0,1024,0,ReceiveCallBack,socket);
        }
        catch (Exception ex)
        {
            stringBuilder.Append("\n" + "接收失败+" + ex.Message);
            Debug.Log("接收失败+" + ex.Message);
        }
    }
    /// 

    /// 异步发送
    /// 
    public void  AsyncSend()
    {
        string sendString = inputField.text;
        byte[] sendBuffer = Encoding.Default.GetBytes(sendString);
        socket.BeginSend(sendBuffer,0,sendBuffer.Length,0,SendCallBack,socket);
        //stringBuilder.Append("\n" + "要发送的数据长度" + sendBuffer.Length);
        Debug.Log("要发送的数据长度" + sendBuffer.Length);
    }
    /// 

    /// 异步发送回调
    /// 
    /// 
    /// 
    private void SendCallBack(IAsyncResult ar)
    {
        try
        {
            Socket socket = ar.AsyncState as Socket;
            int length = socket.EndSend(ar);
            Debug.Log("发送成功"+length);
            //stringBuilder.Append("\n" + "发送成功" + length);
        }
        catch (Exception ex)
        {
            stringBuilder.Append("\n" + "发送失败+" + ex.Message);
            Debug.Log("发送失败+" + ex.Message);
        }

    }

    private void Start()
    {
        sendButton.onClick.AddListener(AsyncSend);
        connetButton.onClick.AddListener(AsyncConnection);
    }
    private void Update()
    {
        textShow.text = stringBuilder.ToString();
    }
    #endregion
    #region 同步模式
    /// 

    /// 同步连接
    /// 
    public void OnConnection()
    {
        socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
        socket.Connect("192.168.0.105", 8888);
        textShow.text = "连接成功";
    }
    /// 

    /// 同步发送
    /// 
    public void Send()
    {
        string sendString = inputField.text;
        byte[] sendBuffer = Encoding.Default.GetBytes(sendString);
        socket.Send(sendBuffer);
        byte[] receiveBuffer = new byte[1024];
        int length = socket.Receive(receiveBuffer);
        string receiveString = Encoding.Default.GetString(receiveBuffer, 0, length);
        textShow.text = receiveString;
        socket.Close();
    }
    #endregion
}