SignalR-Core + SqlTableDependency 实现数据库数据 改变 singalR即时通知到客户端 ，注：如需接受所有改变通知，调整【InventoryDatabaseSubscr iption】类，调整枚举，public enum DmlTriggerType { Delete = 1, Insert = 2, Update = 4, All = 8 }，选择对应的类型就好