How to compare nullable decimal in Entity Framework?

Question

I want to compare nullable decimal values ​​from the database in entity framework LINQ.

I tried these approaches:

return Db.Products.Any(x =>
        (x.WholeSalePriceVATOut== null && product.WholeSalePriceVATOut== null) ?
        true : (x.WholeSalePriceVATOut== null || product.WholeSalePriceVATOut== null) ?
        false : (Decimal.Compare((decimal)x.WholeSalePriceVATOut, (decimal)product.WholeSalePriceVATOut) == 0) ? true : false)

And

return Db.Products.Any(x =>
    ((x.WholeSalePriceVATOut.HasValue) ? (decimal?)Math.Round((decimal)x.WholeSalePriceVATOut, 3) : null) == ((product.WholeSalePriceVATOut.HasValue) ? (decimal?)Math.Round((decimal)product.WholeSalePriceVATOut, 3) : null))

And

return Db.Products.Any(x =>
Decimal.Compare((x.WholeSalePriceVATOut == null) ? -1 : (decimal)x.WholeSalePriceVATOut, (product.WholeSalePriceVATOut == null) ? -1 : (decimal)product.WholeSalePriceVATOut) == 0) ? true : false)

All of these examples throw:

Nullable object must have a value

Is there some elegant way to compare nullable decimal?

Answer 1

Just use Nullable.Equals() . The following should be sufficient:

return Db.Products.Any(p => 
          Nullable.Equals(p.WholeSalePriceVATOut, product.WholeSalePriceVATOut));

When EF converts that into SQL, the relevant part of the SQL will be something like:

WHERE (`Product`.`WholeSalePriceVATOut` = @p__0) OR 
      ((`Product`.`WholeSalePriceVATOut` IS  NULL) AND (@p__0 IS  NULL))))