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:WhenusingSqlDependencywithoutprovidinganoptionsvalue,SqlDependency.Start()mustbecalledpriortoexecutionofacommandaddedtotheSqlDepe...