What causes “extension methods cannot be dynamically dispatched” here?

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So, can somebody please help me understand why leveraging the same overload inside of those other methods is failing with that error?

Precisely because you’re using a dynamic value (param) as one of the arguments. That means it will use dynamic dispatch… but dynamic dispatch isn’t supported for extension methods.

The solution is simple though: just call the static method directly:

return SqlMapper.Query(_connection, sql, param, transaction,
                       buffered, commandTimeout, commandType);

(That’s assuming you really need param to be of type dynamic, of course… as noted in comments, you may well be fine to just change it to object.)

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