Select 中具有多个参数的 EF Core 表达式

Question

So I have a property that I will parse into the Select method. This will work with one parameter but can I make it work with two, and if I can't what would be the approach? I am using EF Core 3.1.8. with the SqlServer 3.1.8 package.

private static Expression<Func<ClassOne, bool, ClassTwo> Summary
{
  get
  {
    return (p, myBool) => new ClassTwo()
    {
      ListOfItems = p.ListWithMyItems.Where(i => i.Field == myBool)
    }
  }
}

This is my Expression. I query with this method.

public async Task<ClassTwo> GetSummaryAsync(bool isAdmin = false)
{
  return await _context
    .DatabaseTable // type of DbSet<ClassOne>
    .Select(Summary) // how do I parse isAdmin to Summary?
    .ToListAsync();
}

So I hope you can see my problem. I want to avoid the where clause in the method because I have at least 10 other methods that use this Expression in different ways and also in my case it would become an nested Where which is not possible which straight querying. I don't want C# to do the work for me, let SQL Server handle that.

Thanks in advance!

---

EDIT:

I tried this in the GetSummaryAsync but it is not possible:

.Select(i => (i, isAdmin))

Answer 1

Define extension method

public static class Extensions {
    public static IQueryable<ClassTwo> Summary(this IQueryable<ClassOne> one, bool myBool)
    {
        return one.Select(p => new ClassTwo
        {
            ListOfItems = p.ListWithMyItems.Where(i => i.Field == myBool)
        });
    }
}

And use it like this.

public async Task<ClassTwo> GetSummaryAsync(bool isAdmin = false)
{
  return await _context
    .DatabaseTable 
    .Summary(isAdmin)
    .ToListAsync();
}