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