DbContextExtensions.cs

public static IEnumerable<T> Query<T>(this DbContext @this, System.Linq.Expressions.Expression<Func<T, bool>> predicate = null)
    where T : class {

    var query = (predicate != null) ? @this.Set<T>().Where(predicate) : @this.Set<T>();
    var cmd = new SqlCommand();

    cmd.Connection = (SqlConnection)(@this.Database.Connection);
    
    //gets the generated t-sql
    cmd.CommandText = query.ToString();
    
    //...
    
}