TreeNode.Checked 属性

获取或设置一个值，用以指示树节点是否处于选中状态。

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

语法

声明
Public Property Checked As Boolean
用法
Dim instance As TreeNode
Dim value As Boolean

value = instance.Checked

instance.Checked = value

public bool Checked { get; set; }

public:
property bool Checked {
    bool get ();
    void set (bool value);
}

/** @property */
public boolean get_Checked ()

/** @property */
public void set_Checked (boolean value)

public function get Checked () : boolean

public function set Checked (value : boolean)

属性值

如果树节点处于选中状态，则为 true；否则为 false。

示例

下面的代码示例通过将 BackColor 属性设置为 Yellow 来突出显示 TreeView 控件（该控件的 Checked 属性设置为 true）中的所有 TreeNode 对象。这段代码要求 Form 上有一个包含 TreeNode 对象集合的 TreeView 控件。

Public Sub HighlightCheckedNodes()
   Dim countIndex As Integer = 0
   Dim selectedNode As String = "Selected customer nodes are : "
   Dim myNode As TreeNode
   For Each myNode In  myTreeView.Nodes(0).Nodes
      ' Check whether the tree node is checked.
      If myNode.Checked Then
         ' Set the node's backColor.
         myNode.BackColor = Color.Yellow
         selectedNode += myNode.Text + " "
         countIndex += 1
      Else
         myNode.BackColor = Color.White
      End If
   Next myNode

   If countIndex > 0 Then
      MessageBox.Show(selectedNode)
   Else
      MessageBox.Show("No nodes are selected")
   End If
End Sub

public void HighlightCheckedNodes()
{
   int countIndex = 0;
   string selectedNode = "Selected customer nodes are : ";
   foreach (TreeNode myNode in myTreeView.Nodes[0].Nodes)
   {
      // Check whether the tree node is checked.
      if(myNode.Checked)
      {
         // Set the node's backColor.
         myNode.BackColor = Color.Yellow;
         selectedNode += myNode.Text+" ";
         countIndex++;
      }
      else
         myNode.BackColor = Color.White;
   }

   if(countIndex > 0)
      MessageBox.Show(selectedNode);
   else
      MessageBox.Show("No nodes are selected");
}

public:
   void HighlightCheckedNodes()
   {
      int countIndex = 0;
      String^ selectedNode = "Selected customer nodes are : ";
      IEnumerator^ myEnum = myTreeView->Nodes[ 0 ]->Nodes->GetEnumerator();
      while ( myEnum->MoveNext() )
      {
         TreeNode^ myNode = safe_cast<TreeNode^>(myEnum->Current);
         
         // Check whether the tree node is checked.
         if ( myNode->Checked )
         {
            
            // Set the node's backColor.
            myNode->BackColor = Color::Yellow;
            selectedNode = String::Concat( selectedNode, myNode->Text, " " );
            countIndex++;
         }
         else
                  myNode->BackColor = Color::White;
      }

      if ( countIndex > 0 )
            MessageBox::Show( selectedNode );
      else
            MessageBox::Show( "No nodes are selected" );
   }

public void HighlightCheckedNodes()
{
    int countIndex = 0;
    String selectedNode = "Selected customer nodes are : ";
    for (int iCtr = 0; iCtr < myTreeView.get_Nodes().get_Item(0).
        get_Nodes().get_Count(); iCtr++) {
        TreeNode myNode = myTreeView.get_Nodes().get_Item(0).
            get_Nodes().get_Item(iCtr);
        // Check whether the tree node is checked.
        if (myNode.get_Checked()) {
            // Set the node's backColor.
            myNode.set_BackColor(Color.get_Yellow());
            selectedNode += myNode.get_Text() + " ";
            countIndex++;
        }
        else {
            myNode.set_BackColor(Color.get_White());
        }
    }
    if (countIndex > 0) {
        MessageBox.Show(selectedNode); 
    }
    else {
        MessageBox.Show("No nodes are selected");
    }
} //HighlightCheckedNodes

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

TreeNode 类
TreeNode 成员
System.Windows.Forms 命名空间
CheckBoxes