如何使用linq在对象列表中进行搜索

Question

I am new in linq and I want to use it in a list without use a foreach . How can I return a list from a list of objects List<House> where house ha swimming pool.

Class Houses
{
  Int Id,
  bool HasSwimmingPool
...
}

Answer 1

All you need is Where method, which filters collection based of given predicate:

var results = source.Where(x => x.HasSwimmingPool).ToList();

Additional ToList() call makes the results List<House> instead of IEnumerable<House> .

You can achieve the same using syntax-based query:

var results = (from h in source
               where h.HasSwimmingPool
               select h).ToList();

Answer 2

That is simple:

var yourCollection = new List<Houses>();
var housesThatHasASwimmingPool = yourCollection.Where(s => s.HasSwimmingPool);

Answer 3

try this:

 var swimmngHomes = listOfHouses.
     Where( h => h.HasSwimmingPool == true);

Answer 4

List<Houses> housesWithPools = oldHouses.Where(x => x.HasSwimmingPool== true);