教程
https://www.cnblogs.com/zhangpengshou/archive/2013/01/17/2864234.html
https://www.cnblogs.com/Brambling/p/8016060.html
https://blog.csdn.net/tjvictor/article/details/4726933
官方文档: https://docs.microsoft.com/zh-cn/sql/relational-databases/clr-integration-data-access-in-process-ado-net/sqlcontext-object?view=sql-server-ver15
官方类库说明: https://docs.microsoft.com/zh-cn/dotnet/api/microsoft.sqlserver.server.sqltriggercontext?view=netframework-4.8
