咋整在一个对象里包含另一个对象？～～～～～～～～
下面的代码示例在 TreeView 控件中显示客户信息。根树节点显示客户名称，子树节点显示分配给每个客户的订单编号。在本示例中，显示 1,000 个客户，每个客户有 15 个订单。使用 BeginUpdate 方法和 EndUpdate 方法可取消重新绘制 TreeView，在 TreeView 创建和绘制 TreeNode 对象时，显示等待 Cursor。本示例要求有一个 Customer 对象，它可存放 Order 对象的集合。本示例还要求您在 Form 上创建了 TreeView 控件的一个实例。
// Create a new ArrayList to hold the Customer objects.
private ArrayList customerArray = new ArrayList();

private void FillMyTreeView()
{
// Add customers to the ArrayList of Customer objects.
for(int x=0; x <1000; x++)
{
customerArray.Add(new Customer( "Customer " + x.ToString()));
}

// Add orders to each Customer object in the ArrayList.
foreach(Customer customer1 in customerArray)
{
for(int y=0; y <15; y++)
{
customer1.CustomerOrders.Add(new Order( "Order " + y.ToString()));
}
}

// Display a wait cursor while the TreeNodes are being created.
Cursor.Current = new Cursor( "MyWait.cur ");

// Suppress repainting the TreeView until all the objects have been created.
treeView1.BeginUpdate();

// Clear the TreeView each time the method is called.
treeView1.Nodes.Clear();

// Add a root TreeNode for each Customer object in the ArrayList.
foreach(Customer customer2 in customerArray)
{
treeView1.Nodes.Add(new TreeNode(customer2.CustomerName));

// Add a child treenode for each Order object in the current Customer object.
foreach(Order order1 in customer2.CustomerOrders)
{
treeView1.Nodes[customerArray.IndexOf(customer2)].Nodes.Add(
new TreeNode(customer2.CustomerName + ". " + order1.OrderID));
}
}

// Reset the cursor to the default for all controls.
Cursor.Current = Cursors.Default;

// Begin repainting the TreeView.
treeView1.EndUpdate();
}

请教各位大侠，在customer对象里咋编存放另一个对象order呢？那个customer1.CustomerOrders.Add中的CustomerOrders咋写呢？是属性还是方法呢？后面那个Add又咋整呢？谢谢！！！


[解决办法]
public class Test
{
..
public string AAA;
...
private Test parent;
public Test MyParent
{
get{return parent;}
set{parent=value;}
}
}


Test.AAA
Test.MyParent.AAA