Enum Flags and HasConversion<string>()

[vflame]

Currently, there's nothing prevent an enum with the [Flags] attribute from also having a conversion to string when configuring the model: HasConversion<string>()

This works fine for client side evaluations but for server side, an issue arises when using enum.HasFlags() in a query since the generated SQL attempts to perform a bitwise & operation on a SQL string equivalent (e.g., varchar/nvarchar).

[ajcvickers]

Team notes: specific case of #10434