TreeView.SelectedNode 屬性

定義

命名空間:

System.Windows.Forms

組件:

System.Windows.Forms.dll

來源:

TreeView.cs

取得或設定目前在樹狀檢視控制中選取的樹節點。

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中選擇的 TreeNode that。

屬性

BrowsableAttribute

範例

以下程式碼範例設定 PathSeparator 了 a TreeView 的屬性，並顯示包含在 TreeNodeCollectionSelectedNode的子樹節點數量。 在樹檢視控制中，子樹節點佔總樹節點的百分比也會被顯示。 這個例子需要你有一個 Form ，且TreeView有一個控制Button點，且該控制TreeNodeCollection點包含多個TreeNode物件（最好有三個或以上層級）。

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

若目前選擇 no TreeNode ，則性質 SelectedNode 為 null。

當你設定這個屬性時，指定的節點會捲入檢視，並展開任何父節點，使指定的節點可見。

當父節點或所選節點的任何祖先節點被程式化或使用者操作收斂時，該倒塌的節點即成為被選中的節點。

另請參閱

• TreeNode