How to convert the following foreach loop to linq format?

Question

Code:

foreach (var item in items)
  testItems.Add(new TestItem { Header = item.TestItemTypeName, Content = item });

testItems is of type ObservableCollection<TabItem>

How to convert the above foreach loop to linq format? Thanks.

Just being curious: why? Also what type is `testItems`? – Emond Apr 08 '14 at 05:59 — Emond, Apr 08 '14 at 05:59
Type is `ObservableCollection` – Earth Apr 08 '14 at 06:02 — Earth, Apr 08 '14 at 06:02

Adriaan Stander · Accepted Answer · 2014-04-08T06:28:38.013

4

How about

items.ForEach(i => testItems.Add(
    new TestItem
    {
        Header = i.TestItemTypeName,
        Content = i
    }));

Given that items is ObservableCollection<TabItem>

you could try

items.ToList().ForEach(i => testItems.Add(
new TestItem
{
    Header = i.TestItemTypeName,
    Content = i
}));

edited Apr 08 '14 at 06:28

answered Apr 08 '14 at 05:59

Adriaan Stander

162,879
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`.ForEach` is not listed in the intellisense. – Earth Apr 08 '14 at 06:07
Is the `items` a list, or an `Enumerable`? – Adriaan Stander Apr 08 '14 at 06:13
`items` is an `IEnumerable`. Thanks. – Earth Apr 08 '14 at 06:24
You need to NuGet "Ix_Main" to get the `ForEach` operator for `IEnumerable`. It's from the Microsoft Reactive Framework team. – Enigmativity Apr 08 '14 at 06:29

score 1 · Answer 2 · edited May 23 '17 at 12:28

1

Providing that testItems has AddRange function, i.e. inherits from List:

testItems.AddRange(items.Select(item => new TestItem{ Header = item.TestItemTypeName, Content = item }));

As you have mentioned,this is an ObservableCollection, so the method is not available. In that case, the way you provided is the simplest possible. However, if you need to use this functionality more often, consider checking the following link:

ObservableCollection Doesn't support AddRange method, so I get notified for each item added, besides what about INotifyCollectionChanging?

edited May 23 '17 at 12:28

Community

1
1

answered Apr 08 '14 at 06:02

Tomas Pastircak

2,867
16
28

`.AddRange` is not listed in the intellisense. – Earth Apr 08 '14 at 06:09
@JohnStephen I have improved the answer as per your comments. – Tomas Pastircak Apr 08 '14 at 06:15

score 0 · Answer 3 · answered Apr 08 '14 at 06:01

Or perhaps:

var testItems = items
                   .Select(item => 
                       new TestItem {
                           Header = item.TestItemTypeName, 
                           Content = item
                       })
                    .ToList();

How to convert the following foreach loop to linq format?

3 Answers3