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