TreeNodeCollection 类

定义

命名空间:

System.Windows.Forms

程序集:

System.Windows.Forms.dll

表示 TreeNode 对象集合。

public ref class TreeNodeCollection : System::Collections::IList

public class TreeNodeCollection : System.Collections.IList

type TreeNodeCollection = class
    interface IList
    interface ICollection
    interface IEnumerable

Public Class TreeNodeCollection
Implements IList

继承

Object

TreeNodeCollection

实现

ICollection IEnumerable IList

示例

下面的代码示例在 控件中 TreeView 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号。 在此示例中，将显示 1，000 个客户，每个客户有 15 个订单。 使用 和 方法抑制 的TreeView重新粉刷，并在 创建和绘制 TreeNode 对象时TreeView显示等待Cursor。EndUpdateBeginUpdate 此示例要求你有一个 Customer 可以保存对象集合的对象 Order 。 它还要求已在 上Form创建了 控件的TreeView实例。

// The basic Customer class.
ref class Customer: public System::Object
{
private:
   String^ custName;

protected:
   ArrayList^ custOrders;

public:
   Customer( String^ customername )
   {
      custName = "";
      custOrders = gcnew ArrayList;
      this->custName = customername;
   }


   property String^ CustomerName 
   {
      String^ get()
      {
         return this->custName;
      }

      void set( String^ value )
      {
         this->custName = value;
      }

   }

   property ArrayList^ CustomerOrders 
   {
      ArrayList^ get()
      {
         return this->custOrders;
      }

   }

};


// End Customer class
// The basic customer Order class.
ref class Order: public System::Object
{
private:
   String^ ordID;

public:
   Order( String^ orderid )
   {
      ordID = "";
      this->ordID = orderid;
   }


   property String^ OrderID 
   {
      String^ get()
      {
         return this->ordID;
      }

      void set( String^ value )
      {
         this->ordID = value;
      }

   }

};
// End Order class



void FillMyTreeView()
{
   // Add customers to the ArrayList of Customer objects.
   for ( int x = 0; x < 1000; x++ )
   {
      customerArray->Add( gcnew Customer( "Customer " + x ) );
   }
   
   // Add orders to each Customer object in the ArrayList.
   IEnumerator^ myEnum = customerArray->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      Customer^ customer1 = safe_cast<Customer^>(myEnum->Current);
      for ( int y = 0; y < 15; y++ )
      {
         customer1->CustomerOrders->Add( gcnew Order( "Order " + y ) );
      }
   }

   // Display a wait cursor while the TreeNodes are being created.
   ::Cursor::Current = gcnew System::Windows::Forms::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.
   myEnum = customerArray->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      Customer^ customer2 = safe_cast<Customer^>(myEnum->Current);
      treeView1->Nodes->Add( gcnew TreeNode( customer2->CustomerName ) );
      
      // Add a child treenode for each Order object in the current Customer object.
      IEnumerator^ myEnum = customer2->CustomerOrders->GetEnumerator();
      while ( myEnum->MoveNext() )
      {
         Order^ order1 = safe_cast<Order^>(myEnum->Current);
         treeView1->Nodes[ customerArray->IndexOf( customer2 ) ]->Nodes->Add( gcnew TreeNode( customer2->CustomerName + "." + order1->OrderID ) );
      }
   }
   
   // Reset the cursor to the default for all controls.
   ::Cursor::Current = Cursors::Default;
   
   // Begin repainting the TreeView.
   treeView1->EndUpdate();
}

// The basic Customer class.
public class Customer : System.Object
{
   private string custName = "";
   protected ArrayList custOrders = new ArrayList();

   public Customer(string customername)
   {
      this.custName = customername;
   }

   public string CustomerName
   {      
      get{return this.custName;}
      set{this.custName = value;}
   }

   public ArrayList CustomerOrders 
   {
      get{return this.custOrders;}
   }
} // End Customer class 

// The basic customer Order class.
public class Order : System.Object
{
   private string ordID = "";

   public Order(string orderid)
   {
      this.ordID = orderid;
   }

   public string OrderID
   {      
      get{return this.ordID;}
      set{this.ordID = value;}
   }
} // End Order class

// 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();
}

Public Class Customer
   Inherits [Object]
   Private custName As String = ""
   Friend custOrders As New ArrayList()

   Public Sub New(ByVal customername As String)
      Me.custName = customername
   End Sub

   Public Property CustomerName() As String
      Get
         Return Me.custName
      End Get
      Set(ByVal Value As String)
         Me.custName = Value
      End Set
   End Property

   Public ReadOnly Property CustomerOrders() As ArrayList
      Get
         Return Me.custOrders
      End Get
   End Property
End Class


Public Class Order
   Inherits [Object]
   Private ordID As String

   Public Sub New(ByVal orderid As String)
      Me.ordID = orderid
   End Sub

   Public Property OrderID() As String
      Get
         Return Me.ordID
      End Get
      Set(ByVal Value As String)
         Me.ordID = Value
      End Set
   End Property
End Class

' Create a new ArrayList to hold the Customer objects.
Private customerArray As New ArrayList()

Private Sub FillMyTreeView()
   ' Add customers to the ArrayList of Customer objects.
   Dim x As Integer
   For x = 0 To 999
      customerArray.Add(New Customer("Customer" + x.ToString()))
   Next x

   ' Add orders to each Customer object in the ArrayList.
   Dim customer1 As Customer
   For Each customer1 In customerArray
      Dim y As Integer
      For y = 0 To 14
         customer1.CustomerOrders.Add(New Order("Order" + y.ToString()))
      Next y
   Next customer1

   ' 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.
   Dim customer2 As Customer
   For Each customer2 In customerArray
      treeView1.Nodes.Add(New TreeNode(customer2.CustomerName))

      ' Add a child TreeNode for each Order object in the current Customer object.
      Dim order1 As Order
      For Each order1 In customer2.CustomerOrders
         treeView1.Nodes(customerArray.IndexOf(customer2)).Nodes.Add( _
    New TreeNode(customer2.CustomerName + "." + order1.OrderID))
      Next order1
   Next customer2

   ' Reset the cursor to the default for all controls.
   Cursor.Current = System.Windows.Forms.Cursors.Default

   ' Begin repainting the TreeView.
   treeView1.EndUpdate()
End Sub

注解

通过 Add、 Remove和 RemoveAt 方法，可以从集合中添加和删除单个树节点。

备注

不支持枚举集合和删除节点。

还可以使用 AddRange 或 Clear 方法在集合中添加或删除所有树节点。

类不能从 TreeNodeCollection 类继承。

属性

Count	获取集合中 TreeNode 对象的总数。
IsReadOnly	获取一个值，该值指示集合是否为只读。
Item[Int32]	获取或设置位于集合中指定索引位置处的 TreeNode。
Item[String]	获取集合中具有指定键的树节点。

方法

Add(String)	将具有指定标签文本的新树节点添加到当前树节点集合的末尾。
Add(String, String)	创建具有指定键和文本的新树节点，并将其添加到集合中。
Add(String, String, Int32)	创建具有指定键、文本和图像的树节点，并将其添加到集合中。
Add(String, String, Int32, Int32)	创建具有指定键、文本和图像的树节点，并将其添加到集合中。
Add(String, String, String)	创建具有指定键、文本和图像的树节点，并将其添加到集合中。
Add(String, String, String, String)	创建具有指定键、文本和图像的树节点，并将其添加到集合中。
Add(TreeNode)	将先前创建的树节点添加到树节点集合的末尾。
AddRange(TreeNode[])	将先前创建的一组树节点添加到集合中。
Clear()	从集合中删除所有树节点。
Contains(TreeNode)	确定指定的树节点是否为集合的成员。
ContainsKey(String)	确定集合是否包含具有指定键的树节点。
CopyTo(Array, Int32)	将整个集合复制到现有数组中，从该数组内的指定位置开始复制。
Equals(Object)	确定指定对象是否等于当前对象。 (继承自 Object)
Find(String, Boolean)	查找具有指定键的树节点，可以选择搜索子节点。
GetEnumerator()	返回可用于循环访问树节点集合的枚举数。
GetHashCode()	作为默认哈希函数。 (继承自 Object)
GetType()	获取当前实例的 Type。 (继承自 Object)
IndexOf(TreeNode)	返回集合中指定树节点的索引。
IndexOfKey(String)	返回具有指定键的首个树节点的索引。
Insert(Int32, String)	创建具有指定文本的树节点，并将其插入指定索引处。
Insert(Int32, String, String)	创建具有指定文本和键的树节点，并将其插入集合中。
Insert(Int32, String, String, Int32)	创建具有指定键、文本和图像的树节点，并将其插入集合中的指定索引处。
Insert(Int32, String, String, Int32, Int32)	创建具有指定键、文本和图像的树节点，并将其插入集合中的指定索引处。
Insert(Int32, String, String, String)	创建具有指定键、文本和图像的树节点，并将其插入集合中的指定索引处。
Insert(Int32, String, String, String, String)	创建具有指定键、文本和图像的树节点，并将其插入集合中的指定索引处。
Insert(Int32, TreeNode)	在树节点集合中的指定位置插入现有树节点。
MemberwiseClone()	创建当前 Object 的浅表副本。 (继承自 Object)
Remove(TreeNode)	从树节点集合中移除指定的树节点。
RemoveAt(Int32)	从树节点集合的指定索引处移除树节点。
RemoveByKey(String)	从集合中移除具有指定键的树节点。
ToString()	返回表示当前对象的字符串。 (继承自 Object)

显式接口实现

ICollection.IsSynchronized	获取一个值，该值指示对集合的访问是否为同步的（线程安全）。
ICollection.SyncRoot	获取可用于同步对集合的访问的对象。
IList.Add(Object)	将对象添加到树节点集合的末尾。
IList.Contains(Object)	确定指定的树节点是否为集合的成员。
IList.IndexOf(Object)	返回集合中指定树节点的索引。
IList.Insert(Int32, Object)	在树节点集合中的指定位置插入现有树节点。
IList.IsFixedSize	获取一个值，该值指示树节点集合是否具有固定大小。
IList.Item[Int32]	获取或设置集合中指定索引处的树节点。
IList.Remove(Object)	从树节点集合中移除指定的树节点。

扩展方法

另请参阅

• TreeView
• TreeNode