TreeView.SelectedNode 屬性

定義

命名空間:

System.Windows.Forms

組件:

System.Windows.Forms.dll

取得或設定目前在樹狀檢視控制項中選取的樹狀節點。

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; }

[<System.ComponentModel.Browsable(false)>]
member this.SelectedNode : System.Windows.Forms.TreeNode with get, set

Public Property SelectedNode As TreeNode

屬性值

TreeNode

目前在樹狀檢視控制項中選取的 TreeNode。

屬性

BrowsableAttribute

範例

下列程式碼範例會設定 PathSeparator 的 TreeView 屬性，並顯示 包含在 的 SelectedNode 子樹狀結構節點 TreeNodeCollection 數目。 也會顯示樹狀檢視控制項中子樹狀節點與樹狀節點總數的百分比。 此範例需要您具有 Form 具有 的 ，以及 TreeView 具有數 TreeNode 個 Button 物件的 控制項 TreeNodeCollection (，最好搭配三個或多個層級) 。

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 TreeNode 選取 ，則 SelectedNode 屬性為 null 。

當您設定此屬性時，指定的節點會捲動到檢視中，並展開任何父節點，以便顯示指定的節點。

當父節點或任何所選節點的上階節點以程式設計方式或透過使用者動作折迭時，折迭的節點會變成選取的節點。

另請參閱

• TreeNode