下一页上显示的示例不起作用: Using c# ClientWebSocket with streams
它挂在以下行上:
等待ws.ConnectAsync(serverUri,CancellationToken.None);
似乎没有建立连接。
请指出最简单的修改,以使以下代码正常工作。我不希望使用任何第三方工具或库。
private static async Task DoClientWebSocket()
{
using (ClientWebSocket ws = new ClientWebSocket())
{
Uri serverUri = new Uri("wss://echo.websocket.org/");
await ws.ConnectAsync(serverUri, CancellationToken.None);
while (ws.State == WebSocketState.Open)
{
string msg = "hello123";
ArraySegment<byte> bytesToSend = new ArraySegment<byte>(Encoding.UTF8.GetBytes(msg));
await ws.SendAsync(bytesToSend, WebSocketMessageType.Text, true, CancellationToken.None);
ArraySegment<byte> bytesReceived = new ArraySegment<byte>(new byte[1024]);
WebSocketReceiveResult result = await ws.ReceiveAsync(bytesReceived, CancellationToken.None);
Console.WriteLine(Encoding.UTF8.GetString(bytesReceived.Array, 0, result.Count));
}
}
}
答案 0 :(得分:1)
您是正确的。您无需添加任何标头即可使用wss://echo.websocket.org/
。您的代码在我的末端运行得很好。但是,我建议您进行一项改进,为您的timeout
,ConnectAsync
和SendAsync
通话添加ReceiveAsync
,以免长时间停留。
我将代码限制为只能SendAsync
调用5次,以便更容易验证输出。
[已编辑:] 包含多次调用`ReceiveAsync来接收完整响应的逻辑。
private static async Task DoClientWebSocket()
{
using (ClientWebSocket ws = new ClientWebSocket())
{
Uri serverUri = new Uri("wss://echo.websocket.org/");
//Implementation of timeout of 5000 ms
var source = new CancellationTokenSource();
source.CancelAfter(5000);
await ws.ConnectAsync(serverUri, source.Token);
var iterationNo = 0;
// restricted to 5 iteration only
while (ws.State == WebSocketState.Open && iterationNo++ < 5)
{
string msg = "hello0123456789123456789123456789123456789123456789123456789";
ArraySegment<byte> bytesToSend =
new ArraySegment<byte>(Encoding.UTF8.GetBytes(msg));
await ws.SendAsync(bytesToSend, WebSocketMessageType.Text,
true, source.Token);
//Receive buffer
var receiveBuffer = new byte[200];
//Multipacket response
var offset = 0;
var dataPerPacket = 10; //Just for example
while (true)
{
ArraySegment<byte> bytesReceived =
new ArraySegment<byte>(receiveBuffer, offset, dataPerPacket);
WebSocketReceiveResult result = await ws.ReceiveAsync(bytesReceived,
source.Token);
//Partial data received
Console.WriteLine("Data:{0}",
Encoding.UTF8.GetString(receiveBuffer, offset,
result.Count));
offset += result.Count;
if (result.EndOfMessage)
break;
}
Console.WriteLine("Complete response: {0}",
Encoding.UTF8.GetString(receiveBuffer, 0,
offset));
}
}
}
static void Main(string[] args)
{
var taskWebConnect = Task.Run(() => DoClientWebSocket());
taskWebConnect.Wait();
}
在命令提示符下输出:
Data:hello01234
Data:5678912345
Data:6789123456
Data:7891234567
Data:8912345678
Data:9123456789
Complete response: hello0123456789123456789123456789123456789123456789123456789