/// <summary>
/// Adds an item attachment to the collection
/// </summary>
/// <typeparam name="TItem">The type of the item to attach.</typeparam>
/// <returns>An ItemAttachment instance.</returns>
public ItemAttachment <TItem> AddItemAttachment <TItem>()
where TItem : Item
{
if (typeof(TItem).GetCustomAttributes(typeof(AttachableAttribute), false).Length == 0)
{
throw new InvalidOperationException(
string.Format(
"Items of type {0} are not supported as attachments.",
typeof(TItem).Name));
}
ItemAttachment <TItem> itemAttachment = new ItemAttachment <TItem>(this.owner);
itemAttachment.Item = (TItem)EwsUtilities.CreateItemFromItemClass(itemAttachment, typeof(TItem), true);
this.InternalAdd(itemAttachment);
return(itemAttachment);
}