C#tcplistener错误 [英] C# tcplistener error

问题描述

public void timer1_Tick(object sender, EventArgs e)
        {

            try
            {
                if (listener.Pending() == true)
                {
                    message = "";
                    client = listener.AcceptTcpClient();
                    StreamReader reader = new StreamReader(client.GetStream());
                    while (reader.Peek() > -1)
                    {
    // I got an error in this code ->>//
                     message = (message +             Convert.ToChar(reader.Read()).ToString);
                    }
                    this.Focus();
                    rtbConversation.Text = (rtbConversation.Text
                                + (message + "\r\n"));


                    //p_objSynth.SelectVoice(cmbInstalled.Text)
                    //p_objSynth.SpeakAsync(TextBox3.Text)
                }

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);

            }
            }

推荐答案

首先，为什么在Timer Tick事件中使用此代码?这是一种糟糕的方式来监听连接，因为您只能以计时器的滴答速度接受连接.

其次，您对message的使用非常混乱.由于无法修改字符串，因此在每次读取字符时，都需要分配一个新的字符串对象，将数据从旧字符串复制到新实例，然后删除旧字符串.请改用StringBuilder.

最后，StreamReader.Read(无论如何，您正在使用的重载)返回一个int，因此您只需执行以下操作即可获得一个char:

First, why is this code in a Timer Tick event?? That''s a lousy way to listen for connections as you can only accept connections at the rate of the timer tick.

Second, your use of message is very messy. Since you cannot modify a string, your allocating a new string object, copying the data from the old string to the new instance, then deleting the old string, ON EVERY READ OF A CHARACTER. Use a StringBuilder instead.

Lastly, StreamReader.Read (the overload that you''re using anyway) returns an int, so you just do this to get a char out of it:

// message should be declared as a StringBuilder.
message.Append((char)reader.Read());

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