[英]Trying to create a signal R chat application but gives error
我正在嘗試創建一個信號R聊天應用程序,在該應用程序中,我希望發送消息的用戶應該是唯一接收消息的人,而不是每個人都應該接收該消息,但不知道我在哪里做錯了,因為任何人都不會收到消息。
我的代碼是這樣的:Hub類
using Microsoft.AspNet.SignalR;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace SignalRTutorials
{
public class ChatHub:Hub
{
public void Send( string message)
{
// Call the broadcastMessage method to update clients.
// Clients.All.broadcastMessage(name, message);
Clients.User(HttpContext.Current.Session["Name"].ToString()).broadcastMessage(message);
}
}
}
索引頁是這樣的:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="index.aspx.cs" Inherits="SignalRTutorials.index1" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>SignalR Simple Chat</title>
<style type="text/css">
.container {
background-color: #99CCFF;
border: thick solid #808080;
padding: 20px;
margin: 20px;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div class="container">
<input type="text" id="message" />
<input type="button" id="sendmessage" value="Send" />
<input type="hidden" id="displayname" runat="server" />
<ul id="discussion">
</ul>
</div>
<!--Script references. -->
<!--Reference the jQuery library. -->
<script src="Scripts/jquery-1.6.4.min.js" ></script>
<!--Reference the SignalR library. -->
<script src="Scripts/jquery.signalR-2.1.0.min.js"></script>
<script src="Scripts/jquery.signalR-2.1.2.min.js"></script>
<!--Reference the autogenerated SignalR hub script. -->
<script src="signalr/hubs"></script>
<!--Add script to update the page and send messages.-->
<script type="text/javascript">
$(function () {
// Declare a proxy to reference the hub.
var chat = $.connection.chatHub;
// Create a function that the hub can call to broadcast messages.
chat.client.OnMessage = function (message) {
// Html encode display name and message.
// var encodedName = $('<div />').text(name).html();
var encodedMsg = $('<div />').text(message).html();
// Add the message to the page. + encodedName
$('#discussion').append('<li><strong>'
+ '</strong>: ' + encodedMsg + '</li>');
};
// Get the user name and store it to prepend to messages.
$('#displayname').val(prompt('Enter your name:', ''));
<% Session["Name"] = displayname.Value ;%>
// Set initial focus to message input box.
$('#message').focus();
// Start the connection.
$.connection.hub.start().done(function () {
$('#sendmessage').click(function () {
// Call the Send method on the hub.
chat.server.send( $('#message').val());
// Clear text box and reset focus for next comment.
$('#message').val('').focus();
});
});
});
</script>
</form>
</body>
</html>
您的問題:我希望發送消息的用戶應該是唯一收到消息的用戶,而不是每個人都應該收到消息。
為了解決這個問題,像這樣修改ChatHub
類。
public void Send(string message)
{
Clients.Caller.broadcastMessage(message); // calling user will be broadcasted the message only.
// OR use below one.
Clients.Client(Context.ConnectionId).broadcastMessage(message); // Context.ConnectionId -- contains connectionid for calling user.
}
當客戶端在服務器端調用函數時,可以通過Context.ConnectionId
檢索其連接ID。
有用的鏈接-http: //www.asp.net/signalr/overview/guide-to-the-api/hubs-api-guide-server#selectingclients
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