When using SqlDependency without providing an options value, SqlDependency.Start() must be called prior to execution of a command added to the SqlDependency instance.

在调试SignalR程序时，提示一个异常：When using SqlDependency without providing an options value, SqlDependency.Start() must be called prior to execution of a command added to the SqlDependency instance.

解决方法是在Global.asax.cs文件中Application_Start()和Application_End()方法中添加下面高亮代码：

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.Mvc;using System.Web.Routing;using Insus.NET.DataBases;using System.Data.SqlClient;namespace Insus.NET{  public class MvcApplication : System.Web.HttpApplication  {    protected void Application_Start()    {      AreaRegistration.RegisterAllAreas();      RouteConfig.RegisterRoutes(RouteTable.Routes);      SqlDependency.Start(DB.ConnectionString);    }    protected void Application_End()    {      SqlDependency.Stop(DB.ConnectionString);    }  }}

Source Code

原标题：When using SqlDependency without providing an options value, SqlDependency.Start() must be called prior to execution of a command added to the SqlDependency instance.

关键词：sql