How Can LINQ Replace Manual Looping in a WHERE IN Clause Equivalent?

LINQ's Where IN Clause

The SQL WHERE IN clause allows you to filter results based on a list of values. LINQ provides a similar functionality with its Where method.

How to Improve Existing Implementation

Your current approach involves iterating through a list of country codes and manually building a result list by querying for each code. This can be inefficient and doesn't leverage the expressiveness of LINQ.

LINQ Alternative

A more concise and efficient way to achieve the same result is to use LINQ's Contains method:

dataSource.StateList.Where(s => countryCodes.Contains(s.CountryCode))

This expression:

1. Selects the StateList from the provided dataSource.
2. Filters the list to include states whose CountryCode is present in the countryCodes list.

By using LINQ's expressive syntax, you can avoid manual looping and produce the desired results more efficiently.

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