/// <summary>
/// 根据索引位置插入一个列表项
/// </summary>
/// <param name="index">索引位置</param>
/// <param name="item">要插入的列表项</param>
public void Insert(int index, ChatListItem item)
{
if (index < 0 || index >= this.count)
{
throw new IndexOutOfRangeException("Index was outside the bounds of the array");
}
if (item == null)
{
throw new ArgumentNullException("Item cannot be null");
}
this.EnsureSpace(1);
for (int i = this.count; i > index; i--)
{
m_arrItem[i] = m_arrItem[i - 1];
}
item.OwnerChatListBox = this.owner;
m_arrItem[index] = item;
this.count++;
this.owner.Invalidate();
}
/// <summary>
/// 判断一个列表项是否在集合内
/// </summary>
/// <param name="item">要判断的列表项</param>
/// <returns>是否在列表项</returns>
public bool Contains(ChatListItem item)
{
return(this.IndexOf(item) != -1);
}
/// <summary>
/// 获取列表项所在的索引位置
/// </summary>
/// <param name="item">要获取的列表项</param>
/// <returns>索引位置</returns>
public int IndexOf(ChatListItem item)
{
return(Array.IndexOf <ChatListItem>(m_arrItem, item));
}