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http://www.cnblogs.com/webenh/p/7897195.html 

 

在.net core webapi里面集成signalr,我们就可以通过调用webapi来实现服务器向客户端推送消息

第一步引用nuget:Mrcrosoft.AspNetCore.SignalR

 

第二步添加配置代码:

首先ConfigureServices里面添加如下代码:

 
 
public void ConfigureServices(IServiceCollection services)
        {
            services.AddSignalR();
            services.AddCors(options =>
            {
                options.AddPolicy("SignalrCore",
                    policy => policy.AllowAnyOrigin()
                                    .AllowAnyHeader()
                                    .AllowAnyMethod());
            });
            services.AddSingleton<IServiceProvider, ServiceProvider>();
        }
 
 

然后Configure里面添加

 
 
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            //跨域支持
            app.UseCors("SignalrCore");
            app.UseSignalR(routes =>
            {
                routes.MapHub<SignalrHubs>("signalrHubs");
            });
            app.UseWebSockets();

            app.UseMvc();
        }
 
 

 

然后我们添加一个hubs

 
 
public class SignalrHubs:Hub
    {
        /// <summary>
        /// 创建signalr链接
        /// </summary>
        /// <param name="parentId">pid(作为用户组)</param>
        /// <param name="shopId">sid</param>
        public Task InitUser(string parentId, string shopId)
        {
            Groups.AddAsync(Context.ConnectionId, parentId);
            SignalrGroups.UserGroups.Add(new SignalrGroups()
            {
                ConnectionId = Context.ConnectionId,
                GroupName = parentId,
                ShopId = shopId
            });
            return Clients.All.InvokeAsync("NoticeOnline", "用户组数据更新完成,新增id为:" + Context.ConnectionId + " pid:" + parentId + "   sid:" + shopId + "");
        }

        public override Task OnDisconnectedAsync(Exception exception)
        {
            //掉线移除用户
            var user = SignalrGroups.UserGroups.FirstOrDefault(c => c.ConnectionId == Context.ConnectionId);
            if (user != null)
            {
                SignalrGroups.UserGroups.Remove(user);
                Groups.RemoveAsync(Context.ConnectionId, user.GroupName);
            }
            return base.OnDisconnectedAsync(exception);
        }
    }
 
 

PS:我这里是根据本人业务需要来做的,大家可以修改成其他的(用户量大的时候内存占用肯定高,这里只做一个简单的例子)

以上基本的环境搭建就已经完成了

接下来控制器里面的代码

 
 
[Produces("application/json")]
    [Route("api/MRSoftPush")]
    public class MRSoftPushController : Controller
    {
        private IHubContext<SignalrHubs> hubContext;
        public MRSoftPushController(IServiceProvider service)
        {
            hubContext = service.GetService<IHubContext<SignalrHubs>>();
        }

        [HttpGet]
        public string Get()
        {
            return DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:ffff");
        }

        /// <summary>
        /// 单个connectionid推送
        /// </summary>
        /// <param name="groups"></param>
        /// <returns></returns>
        [HttpPost,Route("AnyOne")]
        public IActionResult AnyOne([FromBody]IEnumerable<SignalrGroups> groups)
        {
            if (groups != null && groups.Any())
            {
                var ids = groups.Select(c=>c.ShopId);
                var list = SignalrGroups.UserGroups.Where(c=>ids.Contains(c.ShopId));
                foreach (var item in list)
                    hubContext.Clients.Client(item.ConnectionId).InvokeAsync("AnyOne", $"{item.ConnectionId}: {item.Content}");
            }
            return Ok();
        }

        /// <summary>
        /// 全部推送
        /// </summary>
        /// <param name="message"></param>
        /// <returns></returns>
        [HttpGet,Route("EveryOne")]
        public IActionResult EveryOne(string message)
        {
            hubContext.Clients.All.InvokeAsync("EveryOne", $"{message}");
            return Ok();
        }

        /// <summary>
        /// 组推送
        /// </summary>
        /// <param name="group"></param>
        /// <returns></returns>
        [HttpPost,Route("AnyGroups")]
        public IActionResult AnyGroups([FromBody]SignalrGroups group)
        {
            if (group != null)
            {
                hubContext.Clients.Group(group.GroupName).InvokeAsync("AnyGroups", $"{group.Content}");
            }
            return Ok();
        }

        /// <summary>
        /// 多参数接收方式
        /// </summary>
        /// <param name="message"></param>
        /// <returns></returns>
        [HttpGet,Route("MoreParamsRequest")]
        public IActionResult MoreParamsRequest(string message)
        {
            hubContext.Clients.All.InvokeAsync("MoreParamsRequest", message, DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:ffff"));
            return Ok();
        }
    }
 
 

服务器端的代码到这里全部完成,接下来咱们看客户端的代码

我的客户端代码是在另外一个项目里面,和服务器端是分离的

 
 
<input type="text" id="ParentId" placeholder="ParentId" />
<br />
<input type="text" id="ShopId" placeholder="ShopId" />
<br />
<button id="fuckyou">用户上线</button>
<br />
<br />
<br />

<ul id="message" style="color:red;"></ul>

@section scripts {
    <script>
        $(function () {

            let hubUrl = 'http://192.168.0.149:8009/signalrHubs';
            let httpConnection = new signalR.HttpConnection(hubUrl);
            let hubConnection = new signalR.HubConnection(httpConnection);
            $("#fuckyou").click(function () {
                hubConnection.invoke('InitUser', $("#ParentId").val(), $("#ShopId").val());
            });
            hubConnection.on('NoticeOnline', data => {
                $("#message").append("<li>" + data + "</li>");
            });
            hubConnection.on('EveryOne', data => {
                $("#message").append("<li style=\"color:red;\">全部推送:" + data + "</li>");
            });
            hubConnection.on('AnyGroups', data => {
                $("#message").append("<li style=\"color:black;\">单个用户组推送:" + data + "</li>");
            });
            hubConnection.on('AnyOne', data => {
                $("#message").append("<li style=\"color:blue;\">单个ID推送:" + data + "</li>");
            });
            hubConnection.on('MoreParamsRequest', (message, date) => {
                $("#message").append("<li style=\"color:green;\">多参数接收:" + message + " : " + data + "</li>");
            });
            hubConnection.start();

        });
    </script>
}
 
 

页面上引用连个js

<script src="/js/signalr-client.min.js"></script>
<script src="/js/jquery.min.js"></script>

 

到这里基本就已经完成了,下面看一下运行效果