TreeNode.FirstNode 屬性

定義

取得樹狀節點集合的第一個子樹狀節點。Gets the first child tree node in the tree node collection.

public:
 property System::Windows::Forms::TreeNode ^ FirstNode { System::Windows::Forms::TreeNode ^ get(); };
[System.ComponentModel.Browsable(false)]
public System.Windows.Forms.TreeNode FirstNode { get; }
member this.FirstNode : System.Windows.Forms.TreeNode
Public ReadOnly Property FirstNode As TreeNode

屬性值

TreeNode 集合中的第一個子 NodesThe first child TreeNode in the Nodes collection.

屬性

範例

下列程式碼範例會在決定TreeNode是否選取了傳入TreeNode的之後,再TreeNode選取適當的。The following code example selects the appropriate TreeNode after determining if the TreeNode passed in is selected and which TreeNode to select. 這個Form範例要求您的具有TreeView具有包含多個TreeNode物件之的TreeNodeCollection控制項。This example requires that you have a Form with a TreeView control that has a TreeNodeCollection that contains several TreeNode objects. 此外,您也需要具有ComboBox具有下列專案的:[上一步]、[PreviousVisible]、[下一步]、[NextVisible]、[第一個] 和 [最後一步]。It also requires that you have a ComboBox with the following items: "Previous", "PreviousVisible", "Next", "NextVisible", "First", and "Last".

void SelectNode( TreeNode^ node )
{
   if ( node->IsSelected )
   {
      
      // Determine which TreeNode to select.
      String^ str = myComboBox->Text;
      if ( str->Equals( "Previous" ) )
               node->TreeView->SelectedNode = node->PrevNode;
      else
      if ( str->Equals( "PreviousVisible" ) )
               node->TreeView->SelectedNode = node->PrevVisibleNode;
      else
      if ( str->Equals( "Next" ) )
               node->TreeView->SelectedNode = node->NextNode;
      else
      if ( str->Equals( "NextVisible" ) )
               node->TreeView->SelectedNode = node->NextVisibleNode;
      else
      if ( str->Equals( "First" ) )
               node->TreeView->SelectedNode = node->FirstNode;
      else
      if ( str->Equals( "Last" ) )
               node->TreeView->SelectedNode = node->LastNode;
   }

   node->TreeView->Focus();
}
private void SelectNode(TreeNode node)
{
    if(node.IsSelected)
    {
        // Determine which TreeNode to select.
        switch(myComboBox.Text)
        {
            case "Previous":
                node.TreeView.SelectedNode = node.PrevNode;
                break;
            case "PreviousVisible":
                node.TreeView.SelectedNode = node.PrevVisibleNode;
                break;
            case "Next":
                node.TreeView.SelectedNode = node.NextNode;
                break;
            case "NextVisible":
                node.TreeView.SelectedNode = node.NextVisibleNode;
                break;
            case "First":
                node.TreeView.SelectedNode = node.FirstNode;
                break;
            case "Last":
                node.TreeView.SelectedNode = node.LastNode;
                break;
        }
    }
    node.TreeView.Focus();
}
Private Sub SelectNode(node As TreeNode)
   If node.IsSelected Then
      ' Determine which TreeNode to select.
      Select Case myComboBox.Text
         Case "Previous"
            node.TreeView.SelectedNode = node.PrevNode
         Case "PreviousVisible"
            node.TreeView.SelectedNode = node.PrevVisibleNode
         Case "Next"
            node.TreeView.SelectedNode = node.NextNode
         Case "NextVisible"
            node.TreeView.SelectedNode = node.NextVisibleNode
         Case "First"
            node.TreeView.SelectedNode = node.FirstNode
         Case "Last"
            node.TreeView.SelectedNode = node.LastNode
      End Select
   End If
   node.TreeView.Focus()
End Sub

備註

是儲存在TreeNode目前樹狀節點之屬性中的第一個子系。Nodes TreeNodeCollection FirstNodeThe FirstNode is the first child TreeNode in the TreeNodeCollection stored in the Nodes property of the current tree node. 如果沒有子樹狀節點FirstNode ,屬性null會傳回。 TreeNodeIf the TreeNode has no child tree node, the FirstNode property returns null.

適用於