如何将以下foreach循环转换为linq格式？

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.

Answer 1

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
}));

Answer 2

Providing that testItems has AddRange function, ie 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?

Answer 3

Or perhaps:

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