问题
Is it possible to add and remove criteria on the fly with dapper? I need this to implement user driven filtering. It is not feasible to have a query for each filter as there are too many combinations.
回答1:
At the most basic level, you can just build the TSQL dynamically in a StringBuilder - adding extra and c.Name = @name etc . Don't worry about extra parameters; send them all - the library inspects the command and doesn't add any parameters that obviously aren't used. There is a second, newer API for this specific scenario, but I can't remember the specifics without checking (and I'm not at a computer). I can try to add more details later (assuming Sam doesn't).
来源：https://stackoverflow.com/questions/7777765/dynamic-where-clause-in-dapper