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#参考学习文档
https://www.cnblogs.com/cqpanda/p/16815263.html
# 如果不想指定项目名称，需要进入项目目录 一般pwershell进入的是项目根目录，需要命令指定项目
cd .\IRaCIS.Core.Test
# 该目录下如果有多个上下文，需要手动指定
dotnet ef migrations add Initial -p IRaCIS.Core.Test -c IRCContext -o CodeFirstTest/MSSQL/Migrations