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  1. PO
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    <p>Here's a quick first pass at porting that Java code to C#. Doesn't support SSL mode and has only been very lightly tested, but it's a start.</p> <pre><code>using System; using System.Collections.Generic; using System.IO; using System.Net; using System.Net.Sockets; using System.Text; public class WebSocket { private Uri mUrl; private TcpClient mClient; private NetworkStream mStream; private bool mHandshakeComplete; private Dictionary&lt;string, string&gt; mHeaders; public WebSocket(Uri url) { mUrl = url; string protocol = mUrl.Scheme; if (!protocol.Equals("ws") &amp;&amp; !protocol.Equals("wss")) throw new ArgumentException("Unsupported protocol: " + protocol); } public void SetHeaders(Dictionary&lt;string, string&gt; headers) { mHeaders = headers; } public void Connect() { string host = mUrl.DnsSafeHost; string path = mUrl.PathAndQuery; string origin = "http://" + host; mClient = CreateSocket(mUrl); mStream = mClient.GetStream(); int port = ((IPEndPoint)mClient.Client.RemoteEndPoint).Port; if (port != 80) host = host + ":" + port; StringBuilder extraHeaders = new StringBuilder(); if (mHeaders != null) { foreach (KeyValuePair&lt;string, string&gt; header in mHeaders) extraHeaders.Append(header.Key + ": " + header.Value + "\r\n"); } string request = "GET " + path + " HTTP/1.1\r\n" + "Upgrade: WebSocket\r\n" + "Connection: Upgrade\r\n" + "Host: " + host + "\r\n" + "Origin: " + origin + "\r\n" + extraHeaders.ToString() + "\r\n"; byte[] sendBuffer = Encoding.UTF8.GetBytes(request); mStream.Write(sendBuffer, 0, sendBuffer.Length); StreamReader reader = new StreamReader(mStream); { string header = reader.ReadLine(); if (!header.Equals("HTTP/1.1 101 Web Socket Protocol Handshake")) throw new IOException("Invalid handshake response"); header = reader.ReadLine(); if (!header.Equals("Upgrade: WebSocket")) throw new IOException("Invalid handshake response"); header = reader.ReadLine(); if (!header.Equals("Connection: Upgrade")) throw new IOException("Invalid handshake response"); } mHandshakeComplete = true; } public void Send(string str) { if (!mHandshakeComplete) throw new InvalidOperationException("Handshake not complete"); byte[] sendBuffer = Encoding.UTF8.GetBytes(str); mStream.WriteByte(0x00); mStream.Write(sendBuffer, 0, sendBuffer.Length); mStream.WriteByte(0xff); mStream.Flush(); } public string Recv() { if (!mHandshakeComplete) throw new InvalidOperationException("Handshake not complete"); StringBuilder recvBuffer = new StringBuilder(); BinaryReader reader = new BinaryReader(mStream); byte b = reader.ReadByte(); if ((b &amp; 0x80) == 0x80) { // Skip data frame int len = 0; do { b = (byte)(reader.ReadByte() &amp; 0x7f); len += b * 128; } while ((b &amp; 0x80) != 0x80); for (int i = 0; i &lt; len; i++) reader.ReadByte(); } while (true) { b = reader.ReadByte(); if (b == 0xff) break; recvBuffer.Append(b); } return recvBuffer.ToString(); } public void Close() { mStream.Dispose(); mClient.Close(); mStream = null; mClient = null; } private static TcpClient CreateSocket(Uri url) { string scheme = url.Scheme; string host = url.DnsSafeHost; int port = url.Port; if (port &lt;= 0) { if (scheme.Equals("wss")) port = 443; else if (scheme.Equals("ws")) port = 80; else throw new ArgumentException("Unsupported scheme"); } if (scheme.Equals("wss")) throw new NotImplementedException("SSL support not implemented yet"); else return new TcpClient(host, port); } } </code></pre>
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    1. POIs there a WebSocket client implemented for .NET?
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    1. CONote that StringBuilder.Append(byte) doesn't do what you think it does -- it appends the textual representation of the byte to the buffer. Building a list of bytes and then converting that byte[] to a string using Encoding.UTF8.GetString(bytes) works better.
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      1. USPatrick Linskey
 

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