How to Use Dapper's `IN` Clause with Dynamically Generated Lists?

Executing IN Queries with Dynamic Lists in Dapper ORM

Question:

How to construct a Dapper ORM query with an IN clause when the list of values is obtained dynamically from business logic?

Answer:

Dapper ORM natively supports this scenario. Here's how you do it:

string sql = "SELECT * FROM SomeTable WHERE id IN @ids";
var results = conn.Query(sql, new { ids = new[] { 1, 2, 3, 4, 5 }});

Simply provide an object where the property name matches the parameter name in your query. Dapper will handle the conversion to the correct IN clause syntax.

Note: For Postgres databases, you may need to use a slightly different approach. Refer to this answer for details: https://stackoverflow.com/a/41266264

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