Question

我在MVC上使用了信号器自托管，需要在另一台机器上从客户端调用它，所以我写了这样的代码：

   $(function () {

    jQuery.support.cors = true;

    $.connection.hub.url = "http://[server external Ip]:3031/signalr";

    var chat = $.connection.CustomHub;

    chat.client.addMessage = function (data, IMEI) {
                  //SomeCode
        }
    }

一切顺利，但我在Firefox Firebug中出现此错误：

阻止跨源请求：同源策略禁止在http：// [服务器外部IP] /信号器/协商？读取远程资源？connectionData =％5B％7B％22name％22％3A％22customhub％22％ 7D％5D＆安培; clientProtocol = 1.3＆安培; _ = 1400692033406。这可以通过将资源移动到同一域或启用CORS来解决。

Answer 1

您必须在服务器应用程序上启用跨域，方法是在启动SignalR时安装Microsoft.Owin.Cors软件包并调用UseCors()（假设您使用的是SignalR 2.x）。您不需要在SignalR 2.0中指定jQuery.support.cors = true;，实际上您应该将其删除AFAIK。

Answer 2

错误似乎与网络连接有关，我们已经使用了signalR，而对集线器的Url的标识并不是必须的。
在SignalR for Sales对象的实现下面：

1-在数据库SQL Server上启用服务代理：

ALTER DATABASE BlogDemos SET ENABLE_BROKER WITH ROLLBACK IMMEDIATE ;

2-从nuget安装signalR

Install-Package Microsoft.AspNet.SignalR

3-如果不是通过nuget添加的，则添加对signalr javascript库的引用

<script src="/Scripts/jquery.signalR-2.2.1.js"></script>
<!--Reference the autogenerated SignalR hub script. -->
<script src="/signalr/hubs"></script>

4-添加Java脚本以调用集线器

$(function () {
    // Declare a proxy to reference the hub.
    var salesNotificationsHub = $.connection.salesHub;

    // Create a function that the hub can call to broadcast messages.
    salesNotificationsHub.client.updateClientsales = function () {
        Search();
        //alert('des nouveaux sales');
    };

    // Start the connection.

    $.connection.hub.start().done(function () {
        alert('successful connection');
    }).fail(function (e) {
        alert(e);
    });
});

5-添加在步骤4中创建的搜索功能

function Search() {
    grid.reload({ searchString: searchfields });
}

6-创建代码以从GetList函数的Grid中加载网格控制器

 grid = $("#grid").grid({
                dataKey: "Codsales",
                uiLibrary: "bootstrap",
                dataSource:"/sales/GetList",
                autoLoad: true,
                columns: [
                    { field: "Codsales", title: "Code Demande", width: 200, sortable: true },
                    { field: "Libelsales", title: "Libellé Demande", width: 200, sortable: true },
                ],
                pager: { enable: true, limit: 10, sizes: [10, 20, 30, 40] }
            });

7-在控制器中创建GetList函数

public JsonResult GetList()
{
    List<salesData> objsalesList = GetList().ToList();
    return Json(objGridData, JsonRequestBehavior.AllowGet);
}

8-创建函数GetList SqlDependency对象的附加位置

public static List<salesData> GetList()
{            
    SqlDependency dependency = new SqlDependency();

    using (SqlConnection cn = new SqlConnection(connectionString))
    {
        using (var command = new SqlCommand(@"SELECT Codsales, Libelsales, Datsales,DatDetailledsales FROM [dbo].sales ", cn))
        {
            command.Notification = null;
            dependency = new SqlDependency(command);
            dependency.OnChange += new OnChangeEventHandler(dependency_OnChange);

            if (cn.State == ConnectionState.Closed)
                cn.Open();
            command.ExecuteNonQuery();
        }
    }

    List<salesData> objList = new List<salesData>();
    objList=Fetchsales(filterExpression, sortExpression, pageIndex, pageSize, out total);
    rowsCount = total;
    return objList;
}

    private static void dependency_OnChange(object sender, SqlNotificationEventArgs e)
    {
        if (e.Type == SqlNotificationType.Change)
        {                
            salesHub.Updatesales();
        }
    }

9-创建Hub类

public class salesHub : Hub
{   
    [HubMethodName("updatesales")]
    public static void Updatesales()
    {
        IHubContext context = GlobalHost.ConnectionManager.GetHubContext<salesHub>();
        context.Clients.All.updateClientsales();
    }
}

10- Global.asax文件中SqlDependency的配置

protected void Application_Start()
{            //Start SqlDependency with application initialization
    string connString= ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString;
    SqlDependency.Start(connString);
}

protected void Application_End()
{
    //Stop SQL dependency
    string connString = ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString;
    SqlDependency.Stop(connString);
}

私下

signalr客户端400错误请求

2 个答案: