如何在不创建新数组的情况下用字符串填充字节数组？

Question

我正在尝试打开多个 websocket，我需要以某种方式为每个套接字使用相同的缓冲区或在 sending/receiving 新消息之前清除它们。接收方法很好，因为我可以传递字节数组的参数，它会在不创建新的字节数组实例的情况下填充该参数。

我可以用 BitConverter.GetBytes 方法做什么？我需要开始使用不安全的上下文并使用带指针参数的重载 GetBytes 吗？还有其他方法吗？我需要它来填充我将在构造函数中定义的 outBytes 变量。

public class Client:IDisposable
{
    //Fields
    public char[] innerData { get; private set; }

    private byte[] inBytes;
    private byte[] outBytes;

    private ArraySegment<byte> inSegment;
    private ArraySegment<byte> outSegment;


    private WebSocket webSocket;
    public WebSocket Socket => this.webSocket;

    public readonly string clientID;
    //Auxiliary
    private const int BufferSize = 1024;

    public static Client CreateClient(WebSocket socket, string id)
    {
        Client client = new Client(socket, id);

        return client;
    }

    public Client(WebSocket socket, string id)
    {
        this.inBytes = new byte[BufferSize];
        this.inSegment = new ArraySegment<byte>(inBytes);

        this.outBytes = new byte[BufferSize];
        this.outSegment = new ArraySegment<byte>(outBytes);


        this.webSocket = socket;
        this.clientID = id;
        this.innerData = new char[BufferSize];
    }
    public  async Task<WebSocketReceiveResult> ReceiveResult()
    {
        if(this.webSocket.State!=WebSocketState.Open)
        {
            return null;
        }

        WebSocketReceiveResult result = await this.webSocket.ReceiveAsync(this.inSegment, CancellationToken.None);
        Encoding.UTF8.GetChars(this.inSegment.Array, 0, BufferSize, this.innerData, 0);
        return result;
    }

    public async Task SendMessage(string message)
    {
        if(this.webSocket.State==WebSocketState.Open)
        {

            this.outBytes = Encoding.UTF8.GetBytes(message, 0, message.Length); //How can i fill the already existing outBytes?
            await this.webSocket.SendAsync(this.outSegment, WebSocketMessageType.Text, true, CancellationToken.None);
        }

    }

    public void Dispose()
    {
        if(this.webSocket.State!=WebSocketState.Closed)
        {
            this.webSocket.Dispose();
            this.webSocket = null;
        }
    }


}

我需要以某种方式使用已经存在的outBytes，当我转换我将send.At的消息时，outBytes的行为就像一个指针，每次SendMessage方法的迭代GetBytes 将产生一个新的字节数组。

Answer 1

你显然对 GetBytes 的工作原理有错误的误解，它不会每次都生成一个新数组，这个重载:

Encoding.GetBytes Method (String, Int32, Int32, Byte[], Int32)

将

encodes a set of characters from the specified string into the specified byte array (From MSDN)

所以你的台词应该是

Encoding.UTF8.GetBytes(message, 0, message.Length, this.outBytes, 0);

该函数将使用 UTF8 编码将此字符串转换为字节来填充您的数组... 您可以使用整数 return 值来检查已写入数组的字节数。

如何在不创建新数组的情况下用字符串填充字节数组？

How can i fill a byte array with a string without creating a new array?

c#

dispose

unsafe

websocket

.net-core