How to solve the problem that multiple data updates in EFCore cannot be savechanges () at the same time.

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1 add var transaction = ctx.Database.BeginTransaction () under the definition of ModelContext

1.2 add transaction.Commit () after the last SaveChanges ()

3 add transaction.Rollback () to the if (sMsgCode! = "") branch of finally; add transaction.Dispose () at the end

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