TreeView.SelectedImageIndex 属性

  • 项目

获取或设置当树节点选定时所显示的图像的图像列表索引值。

**命名空间:**System.Windows.Forms
**程序集:**System.Windows.Forms（在 system.windows.forms.dll 中）

语法

声明
<LocalizableAttribute(True)> _
Public Property SelectedImageIndex As Integer
用法
Dim instance As TreeView
Dim value As Integer

value = instance.SelectedImageIndex

instance.SelectedImageIndex = value

[LocalizableAttribute(true)] 
public int SelectedImageIndex { get; set; }

[LocalizableAttribute(true)] 
public:
property int SelectedImageIndex {
    int get ();
    void set (int value);
}

/** @property */
public int get_SelectedImageIndex ()

/** @property */
public void set_SelectedImageIndex (int value)

public function get SelectedImageIndex () : int

public function set SelectedImageIndex (value : int)

属性值

从零开始的索引值，它表示 Image 在 ImageList 中的位置。

异常

异常类型 条件

ArgumentException

所分配的索引值小于零。

备注

SelectedImageIndex 值是存储在分配给 ImageList 属性的 ImageList 中的 Image 的索引。

提示

在运行时设置 SelectedImageIndex 属性时，将重新创建 TreeView 句柄（请参见 Control.RecreateHandle）以更新控件的外观。这将折叠除选定的 TreeNode 之外的所有树节点。

示例

下面的代码示例为 TreeView 控件创建并分配一个 ImageList，并用 TreeNode 对象填充 TreeView 控件。为树节点分配 ImageList 中的图像以供处于选定或未选定状态时显示。本示例要求有一个包含 TreeView 的 Form 和一个包含 Customer 对象的 ArrayList，而这些对象均包含 Order 对象。还假定已定义 Customer 和 Order 对象。

Private Sub FillTreeView()
   ' Load the images in an ImageList.
   Dim myImageList As New ImageList()
   myImageList.Images.Add(Image.FromFile("Default.gif"))
   myImageList.Images.Add(Image.FromFile("SelectedDefault.gif"))
   myImageList.Images.Add(Image.FromFile("Root.gif"))
   myImageList.Images.Add(Image.FromFile("UnselectedCustomer.gif"))
   myImageList.Images.Add(Image.FromFile("SelectedCustomer.gif"))
   myImageList.Images.Add(Image.FromFile("UnselectedOrder.gif"))
   myImageList.Images.Add(Image.FromFile("SelectedOrder.gif"))
   
   ' Assign the ImageList to the TreeView.
   myTreeView.ImageList = myImageList
   
   ' Set the TreeView control's default image and selected image indexes.
   myTreeView.ImageIndex = 0
   myTreeView.SelectedImageIndex = 1
   
   ' Set the index of image from the 
   ' ImageList for selected and unselected tree nodes.
   Me.rootImageIndex = 2
   Me.selectedCustomerImageIndex = 3
   Me.unselectedCustomerImageIndex = 4
   Me.selectedOrderImageIndex = 5
   Me.unselectedOrderImageIndex = 6
   
   ' Create the root tree node.
   Dim rootNode As New TreeNode("CustomerList")
   rootNode.ImageIndex = rootImageIndex
   rootNode.SelectedImageIndex = rootImageIndex
   
   ' Add a main root tree node.
   myTreeView.Nodes.Add(rootNode)
   
   ' Add a root tree node for each Customer object in the ArrayList.
   Dim myCustomer As Customer
   For Each myCustomer In  customerArray
      ' Add a child tree node for each Order object.
      Dim countIndex As Integer = 0
      Dim myTreeNodeArray(myCustomer.CustomerOrders.Count) As TreeNode
      Dim myOrder As Order
      For Each myOrder In  myCustomer.CustomerOrders
         ' Add the Order tree node to the array.
         myTreeNodeArray(countIndex) = New TreeNode(myOrder.OrderID, _
            unselectedOrderImageIndex, selectedOrderImageIndex)
         countIndex += 1
      Next myOrder
      ' Add the Customer tree node.
      Dim customerNode As New TreeNode(myCustomer.CustomerName, _
         unselectedCustomerImageIndex, selectedCustomerImageIndex, myTreeNodeArray)
      myTreeView.Nodes(0).Nodes.Add(customerNode)
   Next myCustomer
End Sub

private void FillTreeView()
{
    // Load the images in an ImageList.
    ImageList myImageList = new ImageList();
    myImageList.Images.Add(Image.FromFile("Default.gif"));
    myImageList.Images.Add(Image.FromFile("SelectedDefault.gif"));
    myImageList.Images.Add(Image.FromFile("Root.gif"));
    myImageList.Images.Add(Image.FromFile("UnselectedCustomer.gif"));
    myImageList.Images.Add(Image.FromFile("SelectedCustomer.gif"));
    myImageList.Images.Add(Image.FromFile("UnselectedOrder.gif"));
    myImageList.Images.Add(Image.FromFile("SelectedOrder.gif"));
    
    // Assign the ImageList to the TreeView.
    myTreeView.ImageList = myImageList;
    
    // Set the TreeView control's default image and selected image indexes.
    myTreeView.ImageIndex = 0;
    myTreeView.SelectedImageIndex = 1;

    /* Set the index of image from the 
    ImageList for selected and unselected tree nodes.*/
    this.rootImageIndex = 2;
    this.selectedCustomerImageIndex = 3;
    this.unselectedCustomerImageIndex = 4;
    this.selectedOrderImageIndex = 5;
    this.unselectedOrderImageIndex = 6;
    
    // Create the root tree node.
    TreeNode rootNode = new TreeNode("CustomerList");
    rootNode.ImageIndex = rootImageIndex;
    rootNode.SelectedImageIndex = rootImageIndex;
      
    // Add a main root tree node.
    myTreeView.Nodes.Add(rootNode);

    // Add a root tree node for each Customer object in the ArrayList.
    foreach(Customer myCustomer in customerArray)
    {
        // Add a child tree node for each Order object.
        int countIndex=0;
        TreeNode[] myTreeNodeArray = new TreeNode[myCustomer.CustomerOrders.Count];
        foreach(Order myOrder in myCustomer.CustomerOrders)
        {
            // Add the Order tree node to the array.
            myTreeNodeArray[countIndex] = new TreeNode(myOrder.OrderID,
              unselectedOrderImageIndex, selectedOrderImageIndex);
            countIndex++;
        }
        // Add the Customer tree node.
        TreeNode customerNode = new TreeNode(myCustomer.CustomerName,
            unselectedCustomerImageIndex, selectedCustomerImageIndex, myTreeNodeArray);
        myTreeView.Nodes[0].Nodes.Add(customerNode);
    }
}

void FillTreeView()
{
   
   // Load the images in an ImageList.
   ImageList^ myImageList = gcnew ImageList;
   myImageList->Images->Add( Image::FromFile( "Default.gif" ) );
   myImageList->Images->Add( Image::FromFile( "SelectedDefault.gif" ) );
   myImageList->Images->Add( Image::FromFile( "Root.gif" ) );
   myImageList->Images->Add( Image::FromFile( "UnselectedCustomer.gif" ) );
   myImageList->Images->Add( Image::FromFile( "SelectedCustomer.gif" ) );
   myImageList->Images->Add( Image::FromFile( "UnselectedOrder.gif" ) );
   myImageList->Images->Add( Image::FromFile( "SelectedOrder.gif" ) );
   
   // Assign the ImageList to the TreeView.
   myTreeView->ImageList = myImageList;
   
   // Set the TreeView control's default image and selected image indexes.
   myTreeView->ImageIndex = 0;
   myTreeView->SelectedImageIndex = 1;
   
   /* Set the index of image from the
     ImageList for selected and unselected tree nodes.*/
   this->rootImageIndex = 2;
   this->selectedCustomerImageIndex = 3;
   this->unselectedCustomerImageIndex = 4;
   this->selectedOrderImageIndex = 5;
   this->unselectedOrderImageIndex = 6;
   
   // Create the root tree node.
   TreeNode^ rootNode = gcnew TreeNode( "CustomerList" );
   rootNode->ImageIndex = rootImageIndex;
   rootNode->SelectedImageIndex = rootImageIndex;
   
   // Add a main root tree node.
   myTreeView->Nodes->Add( rootNode );
   
   // Add a root tree node for each Customer object in the ArrayList.
   IEnumerator^ myEnum = customerArray->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      Customer^ myCustomer = safe_cast<Customer^>(myEnum->Current);
      
      // Add a child tree node for each Order object.
      int countIndex = 0;
      array<TreeNode^>^myTreeNodeArray = gcnew array<TreeNode^>(myCustomer->CustomerOrders->Count);
      IEnumerator^ myEnum = myCustomer->CustomerOrders->GetEnumerator();
      while ( myEnum->MoveNext() )
      {
         Order^ myOrder = safe_cast<Order^>(myEnum->Current);
         
         // Add the Order tree node to the array.
         myTreeNodeArray[ countIndex ] = gcnew TreeNode( myOrder->OrderID,unselectedOrderImageIndex,selectedOrderImageIndex );
         countIndex++;
      }
      TreeNode^ customerNode = gcnew TreeNode( myCustomer->CustomerName,unselectedCustomerImageIndex,selectedCustomerImageIndex,myTreeNodeArray );
      myTreeView->Nodes[ 0 ]->Nodes->Add( customerNode );
   }
}

private void FillTreeView()
{
    // Load the images in an ImageList.
    ImageList myImageList = new ImageList();
    myImageList.get_Images().Add(Image.FromFile("Default.gif"));
    myImageList.get_Images().Add(Image.FromFile("SelectedDefault.gif"));
    myImageList.get_Images().Add(Image.FromFile("Root.gif"));
    myImageList.get_Images().Add(Image.FromFile("UnselectedCustomer.gif"));
    myImageList.get_Images().Add(Image.FromFile("SelectedCustomer.gif"));
    myImageList.get_Images().Add(Image.FromFile("UnselectedOrder.gif"));
    myImageList.get_Images().Add(Image.FromFile("SelectedOrder.gif"));
    // Assign the ImageList to the TreeView.
    myTreeView.set_ImageList(myImageList);
    // Set the TreeView control's default image and selected image indexes.
    myTreeView.set_ImageIndex(0);
    myTreeView.set_SelectedImageIndex(1);

    /* Set the index of image from the 
       ImageList for selected and unselected tree nodes.*/
    this.rootImageIndex = 2;
    this.selectedCustomerImageIndex = 3;
    this.unselectedCustomerImageIndex = 4;
    this.selectedOrderImageIndex = 5;
    this.unselectedOrderImageIndex = 6;
    // Create the root tree node.
    TreeNode rootNode = new TreeNode("CustomerList");
    rootNode.set_ImageIndex(rootImageIndex);
    rootNode.set_SelectedImageIndex(rootImageIndex);
    // Add a main root tree node.
    myTreeView.get_Nodes().Add(rootNode);
    // Add a root tree node for each Customer object in the ArrayList.
    for (int iCtr1 = 0; iCtr1 < customerArray.get_Count(); iCtr1++) {
        Customer myCustomer = (Customer)customerArray.get_Item(iCtr1);
        // Add a child tree node for each Order object.
        int countIndex = 0;
        TreeNode myTreeNodeArray[] =
            new TreeNode[myCustomer.customerOrders.get_Count()];
        for (int iCtr2 = 0; iCtr2 < myCustomer.customerOrders.get_Count();
            iCtr2++) {
            Order myOrder = (Order)myCustomer.customerOrders.get_Item(iCtr2);
            // Add the Order tree node to the array.
            myTreeNodeArray.set_Item(countIndex,
                new TreeNode(myOrder.orderID, unselectedOrderImageIndex,
                selectedOrderImageIndex));
            countIndex++;
        }
        // Add the Customer tree node.
        TreeNode customerNode = new TreeNode(myCustomer.customerName,
            unselectedCustomerImageIndex, selectedCustomerImageIndex,
            myTreeNodeArray);
        myTreeView.get_Nodes().get_Item(0).get_Nodes().Add(customerNode);
    }
} //FillTreeView

平台

Windows 98、Windows 2000 SP4、Windows CE、Windows Millennium Edition、Windows Mobile for Pocket PC、Windows Mobile for Smartphone、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition

.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。

版本信息

.NET Framework

受以下版本支持：2.0、1.1、1.0

.NET Compact Framework

受以下版本支持：2.0、1.0

请参见

参考

TreeView 类
TreeView 成员
System.Windows.Forms 命名空间
TreeView.ImageList 属性
TreeView.ImageIndex 属性