Question

我有以下javascript调用服务器端signalR集线器。客户端代码

// A simple templating method for replacing placeholders enclosed in curly braces.
if (!String.prototype.supplant) {
    String.prototype.supplant = function (o) {
        return this.replace(/{([^{}]*)}/g,
            function (a, b) {
                var r = o[b];
                return typeof r === 'string' || typeof r === 'number' ? r : a;
            }
        );
    };
}

$(function () {

    var checker = $.connection.LyncPresenceHub,  //generated client side proxy hub
        available = 'available',
        busy = 'busy',
        $presenceTable = $('lyncPresence'),
        $presenceBody = $presenceTable.find('tbody'),
        rowTemplate = '<tr data-id="{Name}"><td><div class="{Status}"></div></td><td><div class="{Name}"></td></tr>';

    function formatPresence(lyncUser) {
        return $.extend(lyncUser, {
            Name: lyncUser.UserName,
            Status: lyncUser.Presence
        });
    }

    function init() {
        checker.server.GetAllUsers()
            .done(function (lyncUsers) {
                $presenceTable.empty();
                $.each(lyncUsers, function () {
                    var user = formatPresence(this);
                    $presenceBody.append(rowTemplate.supplant(user));
                });
            });
    }

    //Client side hub method which will be called by the server
    checker.client.updateLyncUserPresence = function (LyncUser) {
        var displayPresence = formatPresence(LyncUser);
        $row = $(rowTemplate.supplant(displayPresence));

        $presenceBody.find('tr[data-id=' + LyncUser.Name + ']')
        .replaceWith($row);
    }

    $.connection.hub.start().done(init);
});

SignalR集线器代码（C＃）如下

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Microsoft.AspNet.SignalR;
using Microsoft.AspNet.SignalR.Hubs;
using Oobe.Bobs.Lync.Models;

namespace xxx  {
    [HubName("LyncPresenceHub")]
    public class LyncPresenceHub : Hub
    {
        private readonly LyncPresenceChecker _lyncpresenceChecker;

        public LyncPresenceHub() : this(LyncPresenceChecker.Instance) { }

        public LyncPresenceHub(LyncPresenceChecker checker)
        {
            _lyncpresenceChecker = checker;
        }
        public IEnumerable<LyncUser> GetAllUsers()
        {
            return _lyncpresenceChecker.GetAllUsers();
        }
    }
}

我得到的错误如下。 Object不支持属性或方法“GetAllUsers”

Answer 1

您的问题是JavaScript中不存在GetAllUsers。这是因为，默认情况下，SignalR接受第一个字母，如果它是大写的则使其为小写。您可以使用[HubMethodName(string)]属性覆盖此默认行为，如MSDN in this article所示（和解释）：

在客户端上，代理名称是Hub类名称的驼峰版本。 SignalR自动进行此更改，以便JavaScript代码符合JavaScript约定。

public class ContosoChatHub : Hub
{
    [HubMethodName("NewContosoChatMessage")]
    public void NewContosoChatMessage(string name, string message)
    {
        Clients.All.addContosoChatMessageToPage(name, message);
    }
}

SignalR Client不调用Server功能

1 个答案: