Create a string collection from CheckedListBox.CheckedItems using LINQ

问题

I have used the Entity framework to populate a checked list box. I want to get the names of the checked items as a string collection so that they can then be used as a filter for another LINQ query.

I populate the list box like this...

_eventTypesCheckedList.DataSource = this._dataContext.tblEventTypes.OrderBy(ev => ev.EventTypeName);
_eventTypesCheckedList.DisplayMember = "EventTypeName";

This is how I'm failing to get the string collection...

var types = from eType in ((_eventTypesCheckedList.CheckedItems) as IEnumerable< tblEventType > )
            select new string( eType.EventTypeName.ToCharArray() );

Any help would be great.

回答1:

Cast your CheckItems collection using .Cast<Type>() extension method:

_eventTypesCheckedList.CheckedItems.Cast<tblEventType>()

来源：https://stackoverflow.com/questions/10626107/create-a-string-collection-from-checkedlistbox-checkeditems-using-linq