C# 聊天应用程序写空行

我用以下模型制作了一个聊天应用程序（客户端+服务器）：

区别在于，我也在控制台应用程序中创建了客户机。以下是我的客户端类的代码：

class Program
{
    static TcpClient clientSocket = new TcpClient();
    static NetworkStream serverStream = default(NetworkStream);
    static string readData = null;

    static void Main(string[] args)
    {
        connect();
        while (true)
        {
        string send = Console.ReadLine();
        byte[] outStream = Encoding.ASCII.GetBytes(send + "$");
        serverStream.Write(outStream, 0, outStream.Length);
        serverStream.Flush();
        }
    }

    private static void connect()
    {
            readData = "Connected to Chat Server...";
            msg();
            clientSocket.Connect("localhost", 8888);
            serverStream = clientSocket.GetStream();

            byte[] outStream = Encoding.ASCII.GetBytes("somerandomusername" + "$");
            serverStream.Write(outStream, 0, outStream.Length);
            serverStream.Flush();

            Thread ctThread = new Thread(getMessage);
            ctThread.Start();
    }

    private static void getMessage()
    {
        while (true)
        {
            serverStream = clientSocket.GetStream();
            int buffSize = 0;
            byte[] inStream = new byte[10025];
            buffSize = clientSocket.ReceiveBufferSize;
            serverStream.Read(inStream, 0, buffSize);
            string returndata = Encoding.ASCII.GetString(inStream);
            if (returndata != null)
            {
                readData = "" + returndata;
                msg();
            }
        }
    }

    private static void msg()
    {
        Console.WriteLine(">> " + readData);
    }
}

下面是我的服务器类的代码：

class Program
{
    public static Hashtable clientsList = new Hashtable();

    static void Main(string[] args)
    {
        TcpListener serverSocket = new TcpListener(8888);
        TcpClient clientSocket = default(TcpClient);
        int counter = 0;

        serverSocket.Start();
        Console.WriteLine("Server started...");
        counter = 0;
        while ((true))
        {
            counter += 1;
            clientSocket = serverSocket.AcceptTcpClient();

            byte[] bytesFrom = new byte[10025];
            string dataFromClient = null;

            NetworkStream networkStream = clientSocket.GetStream();
            networkStream.Read(bytesFrom, 0, (int)clientSocket.ReceiveBufferSize);
            dataFromClient = Encoding.ASCII.GetString(bytesFrom);
            dataFromClient = dataFromClient.Substring(0, dataFromClient.IndexOf("$"));

            clientsList.Add(dataFromClient, clientSocket);

            broadcast(dataFromClient + " Joined", dataFromClient, false);

            Console.WriteLine(dataFromClient + " Joined chat room");
            handleClient client = new handleClient();
            client.startClient(clientSocket, dataFromClient, clientsList);
        }

        clientSocket.Close();
        serverSocket.Stop();
        Console.WriteLine("exit");
        Console.ReadLine();
    }

    public static void broadcast(string msg, string uName, bool flag)
    {
        foreach (DictionaryEntry client in clientsList)
        {
            TcpClient broadcastSocket;
            broadcastSocket = (TcpClient)client.Value;
            NetworkStream broadcastStream = broadcastSocket.GetStream();
            Byte[] broadcastBytes = null;
            if (flag == true)
            {
                broadcastBytes = Encoding.ASCII.GetBytes(uName + ": " + msg);
            }
            else
            {
                broadcastBytes = Encoding.ASCII.GetBytes(msg);
            }

            broadcastStream.Write(broadcastBytes, 0, broadcastBytes.Length);
            broadcastStream.Flush();
        }
    }
}

public class handleClient
{
    TcpClient clientSocket;
    string clNo;
    Hashtable clientsList;

    public void startClient(TcpClient inClientSocket, string clineNo, Hashtable cList)
    {
        this.clientSocket = inClientSocket;
        this.clNo = clineNo;
        this.clientsList = cList;
        Thread ctThread = new Thread(doChat);
        ctThread.Start();
    }

    private void doChat()
    {
        int requestCount = 0;
        byte[] bytesFrom = new byte[10025];
        string dataFromClient = null;
        Byte[] sendBytes = null;
        string serverResponse = null;
        string rCount = null;
        requestCount = 0;

        while ((true))
        {
            try
            {
                requestCount = requestCount + 1;
                NetworkStream networkStream = clientSocket.GetStream();
                networkStream.Read(bytesFrom, 0, (int)clientSocket.ReceiveBufferSize);
                dataFromClient = System.Text.Encoding.ASCII.GetString(bytesFrom);
                dataFromClient = dataFromClient.Substring(0, dataFromClient.IndexOf("$"));
                Console.WriteLine("From client - " + clNo + " : " + dataFromClient);
                rCount = Convert.ToString(requestCount);

                Program.broadcast(dataFromClient, clNo, true);
            }
            catch (Exception ex)
            {
                clientsList.Remove(clNo);
                Console.WriteLine(clNo + " hat den Chat verlassen");
                break;
            }
        }
    }
}

不知何故，客户端在接收消息时会显示很多空行。这里有一个截图：。 在第一个红色标记上方有空行。它标记了我输入消息、按enter键并写入服务器响应的区域。要查看它，我必须向下滚动到红色标记。然后是空行。第二个红色标记标记下一条消息将出现的区域

---

如果您能帮我解决这个问题，我将非常感谢。

您确定收到任何文本吗？您发送的文本是否正确？你有什么错误吗？在数据广播之前设置断点，在接收端设置断点，并检查变量是否包含预期的内容

是不是因为您试图从没有任何数据的流中读取数据，并为您提供dummydata，从而导致应用程序打印没有文本的新行，因为它没有要发送的文本

---

空文本的行数是否与您发送的字符串长度相同？

我知道您的问题出在这里是固定代码（在客户端）：

您可以将缓冲区大小读取到需要可用字节的数组中

---

David

您的问题是对

编码.ASCII.GetString

的误用： 字节值0将转换为空格，而不是您可能怀疑的转换为

'\0'

。因为你用10025个零来初始化它，所以有一堆空格填满了你的行。 在将

returndata

附加到

readData

之前对其进行修剪可以解决此问题，但会产生一些副作用，例如不允许在消息中使用前导空格和尾随空格

您可以尝试以下方法来了解问题：

static void Main(string[] args)
{
    byte[] lolempty = new byte[1024];
    string encoded = Encoding.ASCII.GetString(lolempty);
    Console.WriteLine(encoded.Length.ToString());
    Console.WriteLine("[{0}]", encoded);
}

---

我收到了文本。我没有收到任何错误，我已经设置了断点。问题必须在发送消息的服务器部分。当我使用msg（）显示来自客户端的消息时，没有行。只有当我收到来自服务器的消息时。你截屏了服务器。我截屏了客户。这是另一张照片：不，我向下滚动。谢谢，但我已经找到了解决办法。我只需要修剪接收的字节数组，这样就不会有10025个空值。由您决定，但您读取的字节数超过了需要的字节数。我已经更新了我的答案，但不确定您是否收到了警报。

static void Main(string[] args)
{
    byte[] lolempty = new byte[1024];
    string encoded = Encoding.ASCII.GetString(lolempty);
    Console.WriteLine(encoded.Length.ToString());
    Console.WriteLine("[{0}]", encoded);
}