How to Replicate SQL's IN Clause with Entity Framework Attributes?

Entity Framework: Utilizing the IN Clause with Attributes

In Entity Framework, filtering entities based on various fields using IN clauses can be achieved in various ways, including the ANY and CONTAINS methods. However, for a direct SQL-like IN clause, an alternative approach can be employed.

SQL-Like IN Clause Usage

Consider the following SQL query:

SELECT * FROM Licenses WHERE license = 1 AND number IN (1,2,3,45,99)

To replicate this query in Entity Framework, define an array representing the values to be included in the IN clause. For instance:

int[] ids = new int[]{1,2,3,45,99};

Then, modify the Entity Framework query as follows:

using (DatabaseEntities db = new DatabaseEntities ())
{
    return db.Licenses.Where(
        i => i.license == mylicense 
           && ids.Contains(i.number)
        ).ToList();
}

By calling the Contains method on the specified array, Entity Framework effectively filters the Licenses table based on the desired IN clause criteria.

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