Using bitwise operations in a LINQ query

Question

Given the following enum ``` [Flags] public enum Trans{ Purchase =1, Sale=2, All = Purchase | Sale }; ``` And the following class ``` public class Person { public string Name; public Trans TransType; } ``` And the following data structure ``` var people = new List<Person>(); people.Add(new Person {Name="James", TransType = Trans.Purchase}); people.Add(new Person {Name="Nancy", TransType = Trans.Sale}); people.Add(new Person {Name="Heather", TransType = Trans.All}); people.Add(new Person {Name="Duane", TransType = Trans.All}); ``` I am trying to query the list for people meeting certain conditions. To get all people with Trans.Purchase (James, Heather & Duane) ``` var query = from p in people where ( (p.TransType & Trans.Purchase) == Trans.Purchase) select p; ``` To get all people with Trans.Sale (Nancy, Heather & Duane) ``` var query = from p in people where ( (p.TransType & Trans.Sale) == Trans.Sale) select p; ``` What do I need to specify in the where clause of the LINQ query to ret…

Accepted Answer

You could use this query:

```
var query = from p in people 
            where (p.TransType.HasFlag(Trans.Purchase) || p.TransType.HasFlag(Trans.Sale)) 
            select p;
```

The query could also be written this way:

```
var query = from p in people 
            where ((p.TransType & Trans.All) > 0) 
            select p;
```

Using bitwise operations in a LINQ query

Solution

Problem