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在C#中,我們可以使用ASP.NET Core來實現WebSocket和AJAX的結合,從而實現即時通訊。以下是一個簡單的示例:
首先,創建一個ASP.NET Core Web應用程序,并安裝Microsoft.AspNetCore.WebSockets包。
在Startup.cs文件中,配置WebSocket中間件:
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
// ...
app.UseWebSockets();
app.Use(async (context, next) =>
{
if (context.Request.Path == "/ws")
{
if (context.WebSockets.IsWebSocketRequest)
{
var webSocket = await context.WebSockets.AcceptWebSocketAsync();
await Echo(context, webSocket);
}
else
{
context.Response.StatusCode = 400;
}
}
else
{
await next();
}
});
// ...
}
private async Task Echo(HttpContext context, WebSocket webSocket)
{
var buffer = new byte[1024 * 4];
var result = await webSocket.ReceiveAsync(new ArraySegment<byte>(buffer), CancellationToken.None);
while (!result.CloseStatus.HasValue)
{
await webSocket.SendAsync(new ArraySegment<byte>(buffer, 0, result.Count), result.MessageType, result.EndOfMessage, CancellationToken.None);
result = await webSocket.ReceiveAsync(new ArraySegment<byte>(buffer), CancellationToken.None);
}
await webSocket.CloseAsync(result.CloseStatus.Value, result.CloseStatusDescription, CancellationToken.None);
}
<!DOCTYPE html>
<html>
<head>
<title>WebSocket Demo</title>
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
</head>
<body>
<input type="text" id="message" placeholder="Type a message...">
<button id="send">Send</button>
<ul id="messages"></ul>
<script>
$(function () {
var socket = new WebSocket('ws://localhost:5000/ws');
socket.onopen = function (event) {
console.log('WebSocket connection opened:', event);
};
socket.onmessage = function (event) {
$('#messages').append($('<li>').text('Received: ' + event.data));
};
socket.onclose = function (event) {
console.log('WebSocket connection closed:', event);
};
$('#send').click(function () {
var message = $('#message').val();
socket.send(message);
$('#messages').append($('<li>').text('Sent: ' + message));
$('#message').val('');
});
});
</script>
</body>
</html>
這個示例展示了如何在C#中使用ASP.NET Core、WebSocket和AJAX實現即時通訊。你可以根據自己的需求對其進行擴展和優化。
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