TreeView.SelectedNode TreeView.SelectedNode TreeView.SelectedNode TreeView.SelectedNode Property

定義

取得或設定目前在樹狀檢視控制項中選取的樹狀節點。Gets or sets the tree node that is currently selected in the tree view control.

public:
 property System::Windows::Forms::TreeNode ^ SelectedNode { System::Windows::Forms::TreeNode ^ get(); void set(System::Windows::Forms::TreeNode ^ value); };
[System.ComponentModel.Browsable(false)]
public System.Windows.Forms.TreeNode SelectedNode { get; set; }
member this.SelectedNode : System.Windows.Forms.TreeNode with get, set
Public Property SelectedNode As TreeNode

屬性值

目前在樹狀檢視控制項中選取的 TreeNodeThe TreeNode that is currently selected in the tree view control.

範例

下列程式碼範例會設定 TreeViewPathSeparator 屬性,並顯示 SelectedNodeTreeNodeCollection 中所包含的子樹狀節點數目。The following code example sets the PathSeparator property of a TreeView and displays the number of child tree nodes that is contained in the TreeNodeCollection of the SelectedNode. 同時也會顯示樹狀檢視控制項中子樹狀節點與樹狀結構節點總數的百分比。The percentage of child tree node to total tree nodes in the tree view control is also displayed. 這個範例需要您具有 ButtonForm,以及具有 TreeNodeCollection 的 @no__t 2 控制項,其中包含數個 @no__t 4 個物件(最好是三個以上的層級)。This example requires that you have a Form with a Button, and a TreeView control with a TreeNodeCollection that has several TreeNode objects (preferably with three or more levels).

void myButton_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{

   // Set the tree view's PathSeparator property.
   myTreeView->PathSeparator = ".";

   // Get the count of the child tree nodes contained in the SelectedNode.
   int myNodeCount = myTreeView->SelectedNode->GetNodeCount( true );
   Decimal myChildPercentage = ((Decimal)myNodeCount / (Decimal)myTreeView->GetNodeCount( true )) * 100;

   // Display the tree node path and the number of child nodes it and the tree view have.
   MessageBox::Show( String::Concat( "The '", myTreeView->SelectedNode->FullPath, "' node has ", myNodeCount, " child nodes.\nThat is ", String::Format( "{0:###.##}", myChildPercentage ), "% of the total tree nodes in the tree view control." ) );
}
private void myButton_Click(object sender, System.EventArgs e)
{
   // Set the tree view's PathSeparator property.
   myTreeView.PathSeparator = ".";

   // Get the count of the child tree nodes contained in the SelectedNode.
   int myNodeCount = myTreeView.SelectedNode.GetNodeCount(true);
   decimal myChildPercentage = ((decimal)myNodeCount/
     (decimal)myTreeView.GetNodeCount(true)) * 100;

   // Display the tree node path and the number of child nodes it and the tree view have.
   MessageBox.Show("The '" + myTreeView.SelectedNode.FullPath + "' node has "
     + myNodeCount.ToString() + " child nodes.\nThat is "
     + string.Format("{0:###.##}", myChildPercentage)
     + "% of the total tree nodes in the tree view control.");
}
Private Sub myButton_Click(ByVal sender As Object, _
  ByVal e As System.EventArgs) Handles myButton.Click
   ' Set the tree view's PathSeparator property.
   myTreeView.PathSeparator = "."

   ' Get the count of the child tree nodes contained in the SelectedNode.
   Dim myNodeCount As Integer = myTreeView.SelectedNode.GetNodeCount(True)
   Dim myChildPercentage As Decimal = CDec(myNodeCount) / _
      CDec(myTreeView.GetNodeCount(True)) * 100

   ' Display the tree node path and the number of child nodes it and the tree view have.
   MessageBox.Show(("The '" + myTreeView.SelectedNode.FullPath + "' node has " _
      + myNodeCount.ToString() + " child nodes." + Microsoft.VisualBasic.ControlChars.Lf _
      + "That is " + String.Format("{0:###.##}", myChildPercentage) _
      + "% of the total tree nodes in the tree view control."))
End Sub

備註

如果目前未選取任何 TreeNode,則 SelectedNode 屬性會 nullIf no TreeNode is currently selected, the SelectedNode property is null.

當您設定這個屬性時,指定的節點會滾動到 view,而任何父節點都會展開,以便顯示指定的節點。When you set this property, the specified node is scrolled into view and any parent nodes are expanded so that the specified node is visible.

當所選取節點的父節點或任何上階節點以程式設計方式或透過使用者動作折迭時,折迭的節點就會變成選取的節點。When the parent node or any ancestor node of the selected node is collapsed either programmatically or through user action, the collapsed node becomes the selected node.

適用於

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