yield return foreach in linq

Question

Problem: Can any one tell me how to return value in linq. I want to return a collection of RadToolBarButtons and assigning them their values at the time of creation.

Code: I tried in two ways:

IEnumerable<RadToolBarButton> collection = ContextMenuColumn.ToList()
      .ForEach(x => yield return new RadToolBarButton() { Value = x });

Error 11 Cannot implicitly convert type 'void' to 'System.Collections.Generic.IEnumerable'

IEnumerable<RadToolBarButton> collection =
    ContextMenuColumn.SelectMany<string,IEnumerable<RadToolBarButton>>(
       x => new RadToolBarButton() { Value = x });

Error 11 Cannot implicitly convert type 'Telerik.Web.UI.RadToolBarButton' to 'System.Collections.Generic.IEnumerable>'. An explicit conversion exists (are you missing a cast?)

Answer 1

You should use Select instead of ForEach, it does what you are looking for.

IEnumerable<RadToolBarButton> collection = ContextMenuColumn.ToList()
  .Select(x => new RadToolBarButton { Value = x });

I am not sure if the inner ToList is necessary, you may be able to get away with a Cast<T> instead of materializing the intermediate list.

Answer 2

Use Select instead of ForEach, it will do the yield return for you