问题
Given a class like this:
public class Stock
{
public Stock() {}
public Guid StockID { get; set; }
public string Description { get; set; }
}
Lets say I now have a List<Stock>
. If I would like to retrieve a list of all the StockIDs and populate it into a IEnumerable or IList. Obviously I can do this.
List<Stock> stockItems = new List<Stock>();
List<Guid> ids = new List<Guid>();
foreach (Stock itm in stockItems)
{
ids.Add(itm.StockID);
}
But is there some way I could use Linq to achieve the same result? I thought Distinct()
might do it but couldn't work out how to achieve the desired result.
回答1:
var list = stockItems.Select(item => item.StockID).ToList();
回答2:
You could also do it like this:
ids = stockItems.ConvertAll<Guid>(o => o.StockID);
回答3:
How about something like this? Can this be simplified?
List<TranCode> alltrans = new List<TranCode>();
foreach (var bh in obj1.obj2WithCollection.obj2Collection)
{
alltrans.AddRange(bh.obj3WithCollection.Select(e => e.TransactionCode).ToList());
}
来源:https://stackoverflow.com/questions/11574376/return-list-of-specific-property-of-object-using-linq