Igor Levashov - 2 months ago 15

C# Question

here is my question, I have query using entity framework. It has many different operands and I am confused with its priority. I am getting the wrong result. I need all records that

`IsPaid == true`

`IsPaid == null`

`TypeId == 1`

`TypeId == 2`

`CityId == 1`

`CategoryId == 2`

What am I doing wrong? Thanks

`var list = db.Ads.Where (`

x=>x.IsPaid == true ||

x.IsPaid == null && x.TypeId == 1 ||

x.TypeId == 2 && x.CityId == 1 && x.CategoryId == 2).ToList();

Answer

The easiest way to solve this problem is using brackets:

```
(x.IsPaid == true || x.IsPaid == null) && (x.TypeId == 1 || x.TypeId == 2) && x.CityId == 1 && x.CategoryId == 2
```

`&&`

has a higher proirity than `||`

`false && false || true`

->`true`

`false && (false || true)`

->`false`

Sidenote:

there is no need to write `x.IsPaid == true`

since x.IsPaid already is a boolean.

`(x.IsPaid || x.IsPaid == null)`

is the same as `(x.IsPaid == true || x.IsPaid == null)`