TreeView.GetNodeCount(Boolean) 方法

定義

命名空間:

System.Windows.Forms

組件:

System.Windows.Forms.dll

擷取樹狀節點數，選擇性地包括所有指派給樹狀檢視控制項的樹狀子目錄中的樹狀節點。

public:
 int GetNodeCount(bool includeSubTrees);

public int GetNodeCount (bool includeSubTrees);

member this.GetNodeCount : bool -> int

Public Function GetNodeCount (includeSubTrees As Boolean) As Integer

參數

includeSubTrees

Boolean

如果要計算樹狀子目錄所包含的 TreeNode 項目，則為 true，否則為 false。

傳回

Int32

樹狀節點數，選擇性地包括所有指派給樹狀檢閱控制項的樹狀子目錄中的樹狀節點。

範例

下列程式碼範例會設定 PathSeparator 的 TreeView 屬性，並顯示 包含在 的子樹狀結構節點 TreeNodeCollectionSelectedNode 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 includeSubTrees 為 true ，結果就是整個樹狀結構中所有樹狀節點的數目。

另請參閱

• TreeNode